and iOS is in jwxyz.m.
*/
-/* Be advised, this is all very much a work in progress.
-
- TODO: The following should be implemented before OpenGL can be considered
- practical here:
- - Above all, pick the smallest not-yet working hack that utilizes the
- needed functionality.
- - Half-ass the drawing functions.
- - [OK] What Interference needs
- - Fast Pixmaps
- - Whatever clipping is used in XScreenSaver (shape and/or bitmap clipping)
- - Delayed context creation to support anti-aliasing/multisampling
- - Everything these hacks need:
- - FuzzyFlakes (needs wide lines)
- - Greynetic
- - [OK] Deluxe
- - [OK] Get DangerBall going.
- - [OK] iOS.
- - [Interference, so far...] And fast, too.
- - And text really needs to work for the FPS display. */
-
-/* Also, Take note that OS X can actually run with 256 colors. */
+/* Be advised, this is all very much a work in progress. */
+
+/* FWIW, at one point macOS 10.x could actually run with 256 colors. It might
+ not be able to do this anymore, though.
+ */
/* TODO:
- malloc error checking
- iOS: OpenGL ES 2.0 isn't always available. Use OpenGL ES 1.1.
- OS X: Drivers can go back to OpenGL 1.1 (GeForce 2 MX on 10.5.8).
- Use stencil buffers (OpenGL 1.0+) for bitmap clipping masks.
- - glLogicOp is an actual thing that should work for GCs.
- Pixmaps can be any of the following, depending on GL implementation.
- This requires offscreen rendering. Fortunately, this is always
available.
*/
/* OpenGL hacks call a number of X11 functions, including
- * XCopyArea, XDrawString, XGetImage
- * XCreatePixmap, XCreateGC, XCreateImage
- * XPutPixel
- * Check these, of course. */
+ XCopyArea, XDrawString, XGetImage
+ XCreatePixmap, XCreateGC, XCreateImage
+ XPutPixel
+ Check these, of course.
+ */
#ifdef JWXYZ_GL /* entire file */
# import <QuartzCore/QuartzCore.h>
# include <OpenGLES/ES1/gl.h>
# include <OpenGLES/ES1/glext.h>
-
-# define NSView UIView
-# define NSRect CGRect
-# define NSPoint CGPoint
-# define NSSize CGSize
-# define NSColor UIColor
-# define NSImage UIImage
-# define NSEvent UIEvent
-# define NSFont UIFont
-# define NSGlyph CGGlyph
-# define NSWindow UIWindow
-# define NSMakeSize CGSizeMake
-# define NSBezierPath UIBezierPath
-# define colorWithDeviceRed colorWithRed
-
-# define NSFontTraitMask UIFontDescriptorSymbolicTraits
-// The values for the flags for NSFontTraitMask and
-// UIFontDescriptorSymbolicTraits match up, not that it really matters here.
-# define NSBoldFontMask UIFontDescriptorTraitBold
-# define NSFixedPitchFontMask UIFontDescriptorTraitMonoSpace
-# define NSItalicFontMask UIFontDescriptorTraitItalic
-
-# define NSOpenGLContext EAGLContext
-
# else
# include <OpenGL/glu.h>
# endif
# include "jwzglesI.h"
#endif
-#ifdef HAVE_ANDROID
-# include <android/log.h>
-#endif
-
#include "jwxyzI.h"
#include "jwxyz-timers.h"
#include "yarandom.h"
#include "xft.h"
#include "pow2.h"
-#if defined HAVE_COCOA
-# include <CoreGraphics/CGGeometry.h>
-#else
-
-struct CGPoint {
- float x;
- float y;
-};
-typedef struct CGPoint CGPoint;
-
-struct CGSize {
- float width;
- float height;
-};
-typedef struct CGSize CGSize;
-
-struct CGRect {
- CGPoint origin;
- CGSize size;
-};
-typedef struct CGRect CGRect;
-
-#endif
-
-# undef MAX
-# undef MIN
-# define MAX(a,b) ((a)>(b)?(a):(b))
-# define MIN(a,b) ((a)<(b)?(a):(b))
-
-union color_bytes
-{
- /* On 64-bit systems, high bits of the 32-bit pixel are available as scratch
- space. I doubt if any screen savers need it, but just in case... */
- unsigned long pixel;
+union color_bytes {
+ uint32_t pixel;
uint8_t bytes[4];
};
struct jwxyz_Display {
+ const struct jwxyz_vtbl *vtbl; // Must come first.
+
Window main_window;
- Screen *screen;
+ GLenum pixel_format, pixel_type;
+ Visual visual;
struct jwxyz_sources_data *timers_data;
Bool gl_texture_npot_p;
// #endif
unsigned long window_background;
-};
-struct jwxyz_Screen {
- Display *dpy;
- GLenum pixel_format, pixel_type;
- unsigned long black, white;
- Visual *visual;
+ int gc_function;
+ Bool gc_alpha_allowed_p;
+
+ // Alternately, there could be one queue per pixmap.
+ size_t queue_size, queue_capacity;
+ Drawable queue_drawable;
+ GLint queue_mode;
+ GLshort *queue_vertex;
+ uint32_t *queue_color;
+ Bool queue_line_cap;
};
struct jwxyz_GC {
XGCValues gcv;
unsigned int depth;
- // CGImageRef clip_mask; // CGImage copy of the Pixmap in gcv.clip_mask
-};
-
-struct jwxyz_XFontSet {
- XFontStruct *font;
};
struct jwxyz_linked_point {
linked_point *next;
};
-/* XGetImage in CoreGraphics JWXYZ has to deal with funky pixel formats
- necessitating fast & flexible pixel conversion. OpenGL does image format
- conversion itself, so alloc_color and query_color are mercifully simple.
- */
-uint32_t
-jwxyz_alloc_color (Display *dpy,
- uint16_t r, uint16_t g, uint16_t b, uint16_t a)
-{
- union color_bytes color;
-
- /* Instead of (int)(c / 256.0), another possibility is
- (int)(c * 255.0 / 65535.0 + 0.5). This can be calculated using only
- uint8_t integer_math(uint16_t c) {
- unsigned c0 = c + 128;
- return (c0 - (c0 >> 8)) >> 8;
- }
- */
-
- color.bytes[0] = r >> 8;
- color.bytes[1] = g >> 8;
- color.bytes[2] = b >> 8;
- color.bytes[3] = a >> 8;
-
- if (dpy->screen->pixel_format == GL_BGRA_EXT) {
- color.pixel = color.bytes[2] |
- (color.bytes[1] << 8) |
- (color.bytes[0] << 16) |
- (color.bytes[3] << 24);
- } else {
- Assert(dpy->screen->pixel_format == GL_RGBA,
- "jwxyz_alloc_color: Unknown pixel_format");
- }
-
- return (uint32_t)color.pixel;
-}
-
-// Converts an array of pixels ('src') from one format to another, placing the
-// result in 'dest', according to the pixel conversion mode 'mode'.
-void
-jwxyz_query_color (Display *dpy, unsigned long pixel, uint8_t *rgba)
-{
- union color_bytes color;
-
- if(dpy->screen->pixel_format == GL_RGBA)
- {
- color.pixel = pixel;
- for (unsigned i = 0; i != 4; ++i)
- rgba[i] = color.bytes[i];
- return;
- }
-
- Assert (dpy->screen->pixel_format == GL_BGRA_EXT,
- "jwxyz_query_color: Unknown pixel format");
- /* TODO: Cross-check with XAllocColor. */
- rgba[0] = (pixel >> 16) & 0xFF;
- rgba[1] = (pixel >> 8) & 0xFF;
- rgba[2] = (pixel >> 0) & 0xFF;
- rgba[3] = (pixel >> 24) & 0xFF;
-}
-
void
jwxyz_assert_display(Display *dpy)
(caps->major == gl_major && caps->minor >= gl_minor);
}
-/*
-static GLboolean gl_check_ext(const struct gl_caps *caps,
- unsigned gl_major,
- unsigned gl_minor,
- const char *extension)
-{
- return
- gl_check_ver(caps, gl_major, gl_minor) ||
- gluCheckExtension(extension, caps->extensions);
-}
-*/
-
#endif
-// NSOpenGLContext *jwxyz_debug_context;
-
+extern const struct jwxyz_vtbl gl_vtbl;
Display *
-jwxyz_make_display (Window w)
+jwxyz_gl_make_display (Window w)
{
Display *d = (Display *) calloc (1, sizeof(*d));
- d->screen = (Screen *) calloc (1, sizeof(Screen));
- d->screen->dpy = d;
+ d->vtbl = &gl_vtbl;
# ifndef HAVE_JWZGLES
struct gl_version version;
// you're gonna get for getting a texture onto the screen.
# ifdef HAVE_JWZGLES
/* TODO: Make BGRA work on iOS. As it is, it breaks XPutImage. (glTexImage2D, AFAIK) */
- d->screen->pixel_format = GL_RGBA; /*
+ d->pixel_format = GL_RGBA; /*
gluCheckExtension ((const GLubyte *) "GL_APPLE_texture_format_BGRA8888",
extensions) ? GL_BGRA_EXT : GL_RGBA; */
- d->screen->pixel_type = GL_UNSIGNED_BYTE;
+ d->pixel_type = GL_UNSIGNED_BYTE;
// See also OES_read_format.
# else // !HAVE_JWZGLES
if (gl_check_ver (&version, 1, 2) ||
(gluCheckExtension ((const GLubyte *) "GL_EXT_bgra", extensions) &&
gluCheckExtension ((const GLubyte *) "GL_APPLE_packed_pixels",
extensions))) {
- d->screen->pixel_format = GL_BGRA_EXT;
+ // APPLE_packed_pixels is only ever available on iOS, never Android.
+ d->pixel_format = GL_BGRA_EXT;
// Both Intel and PowerPC-era docs say to use GL_UNSIGNED_INT_8_8_8_8_REV.
- d->screen->pixel_type = GL_UNSIGNED_INT_8_8_8_8_REV;
+ d->pixel_type = GL_UNSIGNED_INT_8_8_8_8_REV;
} else {
- d->screen->pixel_format = GL_RGBA;
- d->screen->pixel_type = GL_UNSIGNED_BYTE;
+ d->pixel_format = GL_RGBA;
+ d->pixel_type = GL_UNSIGNED_BYTE;
}
// GL_ABGR_EXT/GL_UNSIGNED_BYTE is another possibilty that may have made more
// sense on PowerPC.
# endif // !HAVE_JWZGLES
- // On really old systems, it would make sense to split the texture
- // into subsections.
+ // On really old systems, it would make sense to split textures
+ // into subsections, to work around the maximum texture size.
# ifndef HAVE_JWZGLES
d->gl_texture_npot_p = gluCheckExtension ((const GLubyte *)
"GL_ARB_texture_rectangle",
d->gl_texture_target = GL_TEXTURE_2D;
# endif
- d->screen->black = jwxyz_alloc_color (d, 0x0000, 0x0000, 0x0000, 0xFFFF);
- d->screen->white = jwxyz_alloc_color (d, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF);
-
- Visual *v = (Visual *) calloc (1, sizeof(Visual));
+ Visual *v = &d->visual;
v->class = TrueColor;
- v->red_mask = jwxyz_alloc_color (d, 0xFFFF, 0x0000, 0x0000, 0x0000);
- v->green_mask = jwxyz_alloc_color (d, 0x0000, 0xFFFF, 0x0000, 0x0000);
- v->blue_mask = jwxyz_alloc_color (d, 0x0000, 0x0000, 0xFFFF, 0x0000);
- d->screen->visual = v;
+ if (d->pixel_format == GL_BGRA_EXT) {
+ v->rgba_masks[0] = 0x00ff0000;
+ v->rgba_masks[1] = 0x0000ff00;
+ v->rgba_masks[2] = 0x000000ff;
+ v->rgba_masks[3] = 0xff000000;
+ } else {
+ Assert(d->pixel_format == GL_RGBA,
+ "jwxyz_gl_make_display: Unknown pixel_format");
+ for (unsigned i = 0; i != 4; ++i) {
+ union color_bytes color;
+ color.pixel = 0;
+ color.bytes[i] = 0xff;
+ v->rgba_masks[i] = color.pixel;
+ }
+ }
d->timers_data = jwxyz_sources_init (XtDisplayToApplicationContext (d));
d->main_window = w;
{
- fputs((char *)glGetString(GL_VENDOR), stderr);
- fputc(' ', stderr);
- fputs((char *)glGetString(GL_RENDERER), stderr);
- fputc(' ', stderr);
- fputs((char *)glGetString(GL_VERSION), stderr);
- fputc('\n', stderr);
-// puts(caps.extensions);
GLint max_texture_size;
glGetIntegerv (GL_MAX_TEXTURE_SIZE, &max_texture_size);
- printf ("GL_MAX_TEXTURE_SIZE: %d\n", max_texture_size);
+ Log ("GL_MAX_TEXTURE_SIZE: %d\n", max_texture_size);
}
// In case a GL hack wants to use X11 to draw offscreen, the rect_texture is available.
glTexParameteri (d->gl_texture_target, GL_TEXTURE_WRAP_S, wrap);
glTexParameteri (d->gl_texture_target, GL_TEXTURE_WRAP_T, wrap);
+ d->gc_function = GXcopy;
+ d->gc_alpha_allowed_p = False;
+
jwxyz_assert_display(d);
return d;
}
void
-jwxyz_free_display (Display *dpy)
+jwxyz_gl_free_display (Display *dpy)
{
/* TODO: Go over everything. */
+ free (dpy->queue_vertex);
+ free (dpy->queue_color);
+
jwxyz_sources_free (dpy->timers_data);
- free (dpy->screen->visual);
- free (dpy->screen);
free (dpy);
}
-/* Call this after any modification to the bits on a Pixmap or Window.
- Most Pixmaps are used frequently as sources and infrequently as
- destinations, so it pays to cache the data as a CGImage as needed.
- */
-static void
-invalidate_drawable_cache (Drawable d)
-{
- /* TODO: Kill this outright. jwxyz_bind_drawable handles any potential
- invalidation.
- */
-
- /*
- if (d && d->cgi) {
- abort();
- CGImageRelease (d->cgi);
- d->cgi = 0;
- }
- */
-}
-
-
/* Call this when the View changes size or position.
*/
void
Log("resize: %d, %d\n", new_width, new_height);
+ jwxyz_gl_flush (dpy);
jwxyz_bind_drawable (dpy, dpy->main_window, dpy->main_window);
// TODO: What does the iPhone need?
// Stylish and attractive purple!
// glClearColor (1, 0, 1, 0.5);
// glClear (GL_COLOR_BUFFER_BIT);
-
- invalidate_drawable_cache (dpy->main_window);
}
-jwxyz_sources_data *
+static jwxyz_sources_data *
display_sources_data (Display *dpy)
{
return dpy->timers_data;
}
-Window
-XRootWindow (Display *dpy, int screen)
+static Window
+root (Display *dpy)
{
- return dpy ? dpy->main_window : 0;
+ return dpy->main_window;
}
-Screen *
-XDefaultScreenOfDisplay (Display *dpy)
+static Visual *
+visual (Display *dpy)
{
- return dpy ? dpy->screen : 0;
+ return &dpy->visual;
}
-Visual *
-XDefaultVisualOfScreen (Screen *screen)
-{
- return screen ? screen->visual : 0;
-}
-Display *
-XDisplayOfScreen (Screen *s)
-{
- return s ? s->dpy : 0;
-}
+/* GC attributes by usage and OpenGL implementation:
-int
-XDisplayNumberOfScreen (Screen *s)
-{
- return 0;
-}
+ All drawing functions:
+ function | glLogicOp w/ GL_COLOR_LOGIC_OP
+ clip_x_origin, clip_y_origin, clip_mask | Stencil mask
-int
-XScreenNumberOfScreen (Screen *s)
-{
- return 0;
-}
+ Shape drawing functions:
+ foreground, background | glColor*
-unsigned long
-XBlackPixelOfScreen(Screen *screen)
-{
- return screen->black;
-}
+ XDrawLines, XDrawRectangles, XDrawSegments:
+ line_width, cap_style, join_style | Lotsa vertices
-unsigned long
-XWhitePixelOfScreen(Screen *screen)
-{
- return screen->white;
-}
+ XFillPolygon:
+ fill_rule | Multiple GL_TRIANGLE_FANs
-unsigned long
-XCellsOfScreen(Screen *screen)
-{
- Visual *v = screen->visual;
- return v->red_mask | v->green_mask | v->blue_mask;
-}
+ XDrawText:
+ font | Cocoa, then OpenGL display lists.
+ alpha_allowed_p | GL_BLEND
-/* GC attributes by usage and OpenGL implementation:
- *
- * All drawing functions:
- * function | glLogicOp w/ GL_COLOR_LOGIC_OP
- * clip_x_origin, clip_y_origin, clip_mask | Stencil mask
- *
- * Shape drawing functions:
- * foreground, background | glColor*
- *
- * XDrawLines, XDrawRectangles, XDrawSegments:
- * line_width, cap_style, join_style | Lotsa vertices
- *
- * XFillPolygon:
- * fill_rule | Multiple GL_TRIANGLE_FANs
- *
- * XDrawText:
- * font | Cocoa, then OpenGL display lists.
- *
- * alpha_allowed_p | TODO
- * antialias_p | TODO
- *
- * Nothing, really:
- * subwindow_mode
-*/
+ antialias_p | Well, there's options:
+ * Multisampling would work, but that's something that would need to be set
+ per-Pixmap, not per-GC.
+ * GL_POINT, LINE, and POLYGON_SMOOTH are the old-school way of doing
+ this, but POINT_SMOOTH is unnecessary, and POLYGON_SMOOTH is missing from
+ GLES 1. All three are missing from GLES 2. Word on the street is that
+ these are deprecated anyway.
+ * Tiny textures with bilinear filtering to get the same effect as LINE_ and
+ POLYGON_SMOOTH. A bit tricky.
+ * Do nothing. Android hardware is very often high-DPI enough that
+ anti-aliasing doesn't matter all that much.
-static void
-set_clip_mask (GC gc)
+ Nothing, really:
+ subwindow_mode
+ */
+
+static GLshort *
+enqueue (Display *dpy, Drawable d, GC gc, int mode, size_t count)
{
- Assert (!gc->gcv.clip_mask, "set_gc: TODO");
+ if (dpy->queue_size &&
+ (dpy->gc_function != gc->gcv.function ||
+ dpy->gc_alpha_allowed_p != gc->gcv.alpha_allowed_p ||
+ dpy->queue_mode != mode ||
+ dpy->queue_drawable != d)) {
+ jwxyz_gl_flush (dpy);
+ }
+
+ jwxyz_bind_drawable (dpy, dpy->main_window, d);
+ jwxyz_gl_set_gc (dpy, gc);
+
+ // TODO: Use glColor when we can get away with it.
+ size_t old_size = dpy->queue_size;
+ dpy->queue_size += count;
+ if (dpy->queue_size > dpy->queue_capacity) {
+ dpy->queue_capacity = dpy->queue_size * 2;
+
+ uint32_t *new_color = realloc (
+ dpy->queue_color, sizeof(*dpy->queue_color) * dpy->queue_capacity);
+ GLshort *new_vertex = realloc (
+ dpy->queue_vertex, sizeof(*dpy->queue_vertex) * 2 * dpy->queue_capacity);
+
+ if (!new_color || !new_vertex)
+ return NULL;
+
+ dpy->queue_color = new_color;
+ dpy->queue_vertex = new_vertex;
+ }
+
+ dpy->queue_mode = mode;
+ dpy->queue_drawable = d;
+
+ union color_bytes color;
+ // TODO: validate color
+ JWXYZ_QUERY_COLOR (dpy, gc->gcv.foreground, 0xffull, color.bytes);
+ for (size_t i = 0; i != count; ++i) // TODO: wmemset when applicable.
+ dpy->queue_color[i + old_size] = color.pixel;
+
+ return dpy->queue_vertex + old_size * 2;
}
+
static void
-set_function (int function)
+set_clip_mask (GC gc)
{
- Assert (function == GXcopy, "set_gc: (TODO) Stubbed gcv function");
-
- /* TODO: The GL_COLOR_LOGIC_OP extension is exactly what is needed here. (OpenGL 1.1)
- Fun fact: The glLogicOp opcode constants are the same as the X11 GX* function constants | GL_CLEAR.
- */
-
-#if 0
- switch (gc->gcv.function) {
- case GXset:
- case GXclear:
- case GXcopy:/*CGContextSetBlendMode (cgc, kCGBlendModeNormal);*/ break;
- case GXxor: CGContextSetBlendMode (cgc, kCGBlendModeDifference); break;
- case GXor: CGContextSetBlendMode (cgc, kCGBlendModeLighten); break;
- case GXand: CGContextSetBlendMode (cgc, kCGBlendModeDarken); break;
- default: Assert(0, "unknown gcv function"); break;
- }
-#endif
+ Assert (!gc->gcv.clip_mask, "set_clip_mask: TODO");
}
GLfloat f = pixel;
glColor4f (f, f, f, 1);
} else {
- /* TODO: alpha_allowed_p */
- uint8_t rgba[4];
- jwxyz_query_color (dpy, pixel, rgba);
-#ifdef HAVE_JWZGLES
- glColor4f (rgba[0] / 255.0f, rgba[1] / 255.0f,
- rgba[2] / 255.0f, rgba[3] / 255.0f);
-#else
- glColor4ubv (rgba);
-#endif
+ GLfloat rgba[4];
+ JWXYZ_QUERY_COLOR (dpy, pixel, 1.0f, rgba);
+ glColor4f (rgba[0], rgba[1], rgba[2], rgba[3]);
}
}
-/* Pushes a GC context; sets Function, ClipMask, and color.
- */
-static void
-set_color_gc (Display *dpy, GC gc, unsigned long color)
+/* Pushes a GC context; sets Function and ClipMask. */
+void
+jwxyz_gl_set_gc (Display *dpy, GC gc)
{
- // GC is NULL for XClearArea and XClearWindow.
- unsigned int depth;
int function;
+ Bool alpha_allowed_p;
+
+ // GC is NULL for XClearArea and XClearWindow.
if (gc) {
function = gc->gcv.function;
- depth = gc->depth;
+ alpha_allowed_p = gc->gcv.alpha_allowed_p;
set_clip_mask (gc);
} else {
function = GXcopy;
- depth = visual_depth (NULL, NULL);
- // TODO: Set null clip mask here.
+ alpha_allowed_p = False;
+ // TODO: Set null clip mask for NULL GC here.
+ }
+
+ /* GL_COLOR_LOGIC_OP: OpenGL 1.1. */
+ if (function != dpy->gc_function) {
+ dpy->gc_function = function;
+ if (function != GXcopy) {
+ /* Fun fact: The glLogicOp opcode constants are the same as the X11 GX*
+ function constants | GL_CLEAR.
+ */
+ glEnable (GL_COLOR_LOGIC_OP);
+ glLogicOp (gc->gcv.function | GL_CLEAR);
+ } else {
+ glDisable (GL_COLOR_LOGIC_OP);
+ }
+ }
+
+ /* Cocoa uses add/subtract/difference blending in place of logical ops.
+ It looks nice, but implementing difference blending in OpenGL appears to
+ require GL_KHR_blend_equation_advanced, and support for this is not
+ widespread.
+ */
+
+ if (alpha_allowed_p != dpy->gc_alpha_allowed_p) {
+ dpy->gc_alpha_allowed_p = alpha_allowed_p;
+ if (gc && gc->gcv.alpha_allowed_p) {
+ // TODO: Maybe move glBlendFunc to XCreatePixmap?
+ glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ glEnable (GL_BLEND);
+ } else {
+ glDisable (GL_BLEND);
+ }
}
+}
- set_function (function);
- switch (function) {
- case GXset: color = (depth == 1 ? 1 : WhitePixel(dpy,0)); break;
- case GXclear: color = (depth == 1 ? 0 : BlackPixel(dpy,0)); break;
+static void
+set_color_gc (Display *dpy, Drawable d, GC gc, unsigned long color)
+{
+ jwxyz_gl_flush (dpy);
+ jwxyz_bind_drawable (dpy, dpy->main_window, d);
+ jwxyz_gl_set_gc (dpy, gc);
+
+ unsigned int depth;
+
+ if (gc) {
+ depth = gc->depth;
+
+ switch (gc->gcv.function) {
+ case GXset: color = (depth == 1 ? 1 : WhitePixel(dpy,0)); break;
+ case GXclear: color = (depth == 1 ? 0 : BlackPixel(dpy,0)); break;
+ }
+ } else {
+ depth = visual_depth (NULL, NULL);
}
set_color (dpy, color, depth, gc ? gc->gcv.alpha_allowed_p : False);
-
- /* TODO: Antialiasing. */
- /* CGContextSetShouldAntialias (cgc, antialias_p); */
}
/* Pushes a GC context; sets color to the foreground color.
*/
static void
-set_fg_gc (Display *dpy, GC gc)
+set_fg_gc (Display *dpy, Drawable d, GC gc)
{
- set_color_gc (dpy, gc, gc->gcv.foreground);
+ set_color_gc (dpy, d, gc, gc->gcv.foreground);
}
static void
}
}
-int
-XDrawPoints (Display *dpy, Drawable d, GC gc,
- XPoint *points, int count, int mode)
+static int
+DrawPoints (Display *dpy, Drawable d, GC gc,
+ XPoint *points, int count, int mode)
{
- jwxyz_bind_drawable (dpy, dpy->main_window, d);
- set_fg_gc (dpy, gc);
-
-/*
-
- glBegin(GL_POINTS);
- for (unsigned i = 0; i < count; i++) {
- next_point(v, points[i], mode);
- glVertex2f(v[0] + 0.5f, v[1] + 0.5f);
- }
- glEnd();
- */
-
short v[2] = {0, 0};
// TODO: XPoints can be fed directly to OpenGL.
- GLshort *gl_points = malloc (count * 2 * sizeof(GLshort)); // TODO: malloc returns NULL.
+ GLshort *gl_points = enqueue (dpy, d, gc, GL_POINTS, count); // TODO: enqueue returns NULL.
for (unsigned i = 0; i < count; i++) {
next_point (v, points[i], mode);
gl_points[2 * i] = v[0];
gl_points[2 * i + 1] = v[1];
}
-
- glMatrixMode (GL_MODELVIEW);
- glTranslatef (0.5, 0.5, 0);
-
- glEnableClientState (GL_VERTEX_ARRAY);
- glDisableClientState (GL_TEXTURE_COORD_ARRAY);
- glVertexPointer (2, GL_SHORT, 0, gl_points);
- glDrawArrays (GL_POINTS, 0, count);
-
- free (gl_points);
-
- glLoadIdentity ();
-
+
return 0;
}
static GLint
-texture_internalformat(Display *dpy)
+texture_internalformat (Display *dpy)
{
#ifdef HAVE_JWZGLES
- return dpy->screen->pixel_format;
+ return dpy->pixel_format;
#else
return GL_RGBA;
#endif
}
-static GLenum gl_pixel_type(const Display *dpy)
+static GLenum
+gl_pixel_type (const Display *dpy)
{
- return dpy->screen->pixel_type;
+ return dpy->pixel_type;
}
static void
clear_texture (Display *dpy)
{
glTexImage2D (dpy->gl_texture_target, 0, texture_internalformat(dpy), 0, 0,
- 0, dpy->screen->pixel_format, gl_pixel_type (dpy), NULL);
+ 0, dpy->pixel_format, gl_pixel_type (dpy), NULL);
}
-static void set_white (void)
+static void
+set_white (void)
{
#ifdef HAVE_JWZGLES
glColor4f (1, 1, 1, 1);
}
+void
+jwxyz_gl_flush (Display *dpy)
+{
+ if (!dpy->queue_size)
+ return;
+
+ // jwxyz_bind_drawable() and jwxyz_gl_set_gc() is called in enqueue().
+
+ glEnableClientState (GL_COLOR_ARRAY);
+ glEnableClientState (GL_VERTEX_ARRAY);
+ glDisableClientState (GL_TEXTURE_COORD_ARRAY);
+
+ // TODO: Use glColor instead of glColorPointer if there's just one color.
+ // TODO: Does OpenGL use both GL_COLOR_ARRAY and glColor at the same time?
+ set_white();
+
+ Bool shifted = dpy->queue_mode == GL_POINTS || dpy->queue_mode == GL_LINES;
+ if (shifted) {
+ glMatrixMode (GL_MODELVIEW);
+ glTranslatef (0.5, 0.5, 0);
+ }
+
+ glColorPointer (4, GL_UNSIGNED_BYTE, 0, dpy->queue_color);
+ glVertexPointer (2, GL_SHORT, 0, dpy->queue_vertex);
+ glDrawArrays (dpy->queue_mode, 0, dpy->queue_size);
+
+ // TODO: This is right, right?
+ if (dpy->queue_mode == GL_LINES && dpy->queue_line_cap) {
+ Assert (!(dpy->queue_size % 2), "bad count for GL_LINES");
+ glColorPointer (4, GL_UNSIGNED_BYTE, sizeof(GLubyte) * 8,
+ dpy->queue_color);
+ glVertexPointer (2, GL_SHORT, sizeof(GLshort) * 4, dpy->queue_vertex + 2);
+ glDrawArrays (GL_POINTS, 0, dpy->queue_size / 2);
+ }
+
+ if (shifted)
+ glLoadIdentity ();
+
+ glDisableClientState (GL_COLOR_ARRAY);
+ glDisableClientState (GL_VERTEX_ARRAY);
+
+ dpy->queue_size = 0;
+}
+
+
void
jwxyz_gl_copy_area_read_tex_image (Display *dpy, unsigned src_height,
int src_x, int src_y,
src_x, src_height - src_y - height, width, height, 0);
} else {
glTexImage2D (dpy->gl_texture_target, 0, internalformat, tex_w, tex_h,
- 0, dpy->screen->pixel_format, gl_pixel_type(dpy), NULL);
+ 0, dpy->pixel_format, gl_pixel_type(dpy), NULL);
glCopyTexSubImage2D (dpy->gl_texture_target, 0, 0, 0,
src_x, src_height - src_y - height, width, height);
}
unsigned int width, unsigned int height,
int dst_x, int dst_y)
{
- Assert(gc->gcv.function == GXcopy, "XCopyArea: Unknown function");
+ jwxyz_gl_set_gc (dpy, gc);
/* TODO: Copy-pasted from read_tex_image. */
unsigned tex_w = width, tex_h = height;
}
-#if 0
-// TODO: Make sure offset works in super-sampled mode.
-static void
-adjust_point_for_line (GC gc, CGPoint *p)
-{
- // Here's the authoritative discussion on how X draws lines:
- // http://www.x.org/releases/current/doc/xproto/x11protocol.html#requests:CreateGC:line-width
- if (gc->gcv.line_width <= 1) {
- /* Thin lines are "drawn using an unspecified, device-dependent
- algorithm", but seriously though, Bresenham's algorithm. Bresenham's
- algorithm runs to and from pixel centers.
-
- There's a few screenhacks (Maze, at the very least) that set line_width
- to 1 when it probably should be set to 0, so it's line_width <= 1
- instead of < 1.
- */
- p->x += 0.5;
- p->y -= 0.5;
- } else {
- /* Thick lines OTOH run from the upper-left corners of pixels. This means
- that a horizontal thick line of width 1 straddles two scan lines.
- Aliasing requires one of these scan lines be chosen; the following
- nudges the point so that the right choice is made. */
- p->y -= 1e-3;
- }
-}
-#endif
-
-
-int
-XDrawLine (Display *dpy, Drawable d, GC gc, int x1, int y1, int x2, int y2)
-{
- // TODO: XDrawLine == XDrawSegments(nlines == 1), also in jwxyz.m
- XSegment segment;
- segment.x1 = x1;
- segment.y1 = y1;
- segment.x2 = x2;
- segment.y2 = y2;
- XDrawSegments (dpy, d, gc, &segment, 1);
-
- // when drawing a zero-length line, obey line-width and cap-style.
-/* if (x1 == x2 && y1 == y2) {
- int w = gc->gcv.line_width;
- x1 -= w/2;
- y1 -= w/2;
- if (gc->gcv.line_width > 1 && gc->gcv.cap_style == CapRound)
- return XFillArc (dpy, d, gc, x1, y1, w, w, 0, 360*64);
- else {
- if (!w)
- w = 1; // Actually show zero-length lines.
- return XFillRectangle (dpy, d, gc, x1, y1, w, w);
- }
- }
-
- CGPoint p = point_for_line (d, gc, x1, y1);
-
- push_fg_gc (dpy, d, gc, NO);
-
- CGContextRef cgc = d->cgc;
- set_line_mode (cgc, &gc->gcv);
- CGContextBeginPath (cgc);
- CGContextMoveToPoint (cgc, p.x, p.y);
- p = point_for_line(d, gc, x2, y2);
- CGContextAddLineToPoint (cgc, p.x, p.y);
- CGContextStrokePath (cgc);
- pop_gc (d, gc);
- invalidate_drawable_cache (d); */
- return 0;
-}
-
-int
-XDrawLines (Display *dpy, Drawable d, GC gc, XPoint *points, int count,
- int mode)
+static int
+DrawLines (Display *dpy, Drawable d, GC gc, XPoint *points, int count,
+ int mode)
{
- jwxyz_bind_drawable (dpy, dpy->main_window, d);
- set_fg_gc (dpy, gc);
+ set_fg_gc (dpy, d, gc);
/* TODO: Thick lines
* Zero-length line segments
}
-int
-XDrawSegments (Display *dpy, Drawable d, GC gc, XSegment *segments, int count)
+// Turn line segment into parallelogram based on line_width
+//
+// TODO: Fix epicycle hack with large thickness, and truchet line segment ends
+//
+static void drawThickLine(int line_width, XSegment *segments)
{
- jwxyz_bind_drawable (dpy, dpy->main_window, d);
- set_fg_gc (dpy, gc);
-
- /* TODO: Thick lines. */
+ double dx, dy, di, m, angle;
+ int sx1, sx2, sy1, sy2;
+
+ sx1 = segments->x1;
+ sy1 = segments->y1;
+ sx2 = segments->x2;
+ sy2 = segments->y2;
+
+ dx = sx1 - sx2;
+ dy = sy1 - sy2;
+ di = sqrt(dx * dx + dy * dy);
+ dx = dx / di;
+ dy = dy / di;
+ m = dy / dx;
+
+ angle = atan(m);
+
+ float sn = sin(angle);
+ float cs = cos(angle);
+ float line_width_f = (float) line_width;
+
+ float wsn = line_width_f * (sn/2);
+ float csn = line_width_f * (cs/2);
+
+ float x3 = sx1 - wsn;
+ float y3 = sy1 + csn;
+ float x4 = sx1 + wsn;
+ float y4 = sy1 - csn;
+
+ float x5 = sx2 - wsn;
+ float y5 = sy2 + csn;
+ float x6 = sx2 + wsn;
+ float y6 = sy2 - csn;
+
+ GLfloat coords[4][2] =
+ {
+ {x3, y3},
+ {x4, y4},
+ {x6, y6},
+ {x5, y5}
+ };
+
+ glEnableClientState (GL_VERTEX_ARRAY);
+ glVertexPointer (2, GL_FLOAT, 0, coords);
+ jwxyz_assert_gl ();
+ glDrawArrays (GL_TRIANGLE_FAN, 0, 4);
+ jwxyz_assert_gl ();
+}
+
+
+static int
+DrawSegments (Display *dpy, Drawable d, GC gc, XSegment *segments, int count)
+{
+ /* TODO: Caps on thick lines. */
/* Thin lines <= 1px are offset by +0.5; thick lines are not. */
-
- glMatrixMode (GL_MODELVIEW);
- glTranslatef (0.5, 0.5, 0);
- glEnableClientState (GL_VERTEX_ARRAY);
- glDisableClientState (GL_TEXTURE_COORD_ARRAY);
-
- Assert (sizeof(XSegment) == sizeof(short) * 4, "XDrawSegments: Data alignment mix-up."); // TODO: Static assert here.
- Assert (sizeof(GLshort) == sizeof(short), "XDrawSegments: Data alignment mix-up."); // TODO: Static assert here.
- Assert (offsetof(XSegment, x1) == 0, "XDrawSegments: Data alignment mix-up.");
- Assert (offsetof(XSegment, x2) == 4, "XDrawSegments: Data alignment mix-up.");
- glVertexPointer (2, GL_SHORT, 0, segments);
- glDrawArrays (GL_LINES, 0, count * 2);
-
- if (gc->gcv.cap_style != CapNotLast) {
- glVertexPointer (2, GL_SHORT, sizeof(GLshort) * 4, (const GLshort *)segments + 2);
- glDrawArrays (GL_POINTS, 0, count);
+ if (count == 1 && gc->gcv.line_width > 1) {
+ set_fg_gc (dpy, d, gc);
+ drawThickLine(gc->gcv.line_width,segments);
}
-
- glLoadIdentity ();
-
-/* CGRect wr = d->frame;
- push_fg_gc (dpy, d, gc, NO);
- set_line_mode (cgc, &gc->gcv);
- CGContextBeginPath (cgc);
- for (i = 0; i < count; i++) {
- CGPoint p = point_for_line (d, gc, segments->x1, segments->y1);
- CGContextMoveToPoint (cgc, p.x, p.y);
- p = point_for_line (d, gc, segments->x2, segments->y2);
- CGContextAddLineToPoint (cgc, p.x, p.y);
- segments++;
+ else {
+ if (dpy->queue_line_cap != (gc->gcv.cap_style != CapNotLast))
+ jwxyz_gl_flush (dpy);
+ dpy->queue_line_cap = gc->gcv.cap_style != CapNotLast;
+
+ // TODO: Static assert here.
+ Assert (sizeof(XSegment) == sizeof(short) * 4 &&
+ sizeof(GLshort) == sizeof(short) &&
+ offsetof(XSegment, x1) == 0 &&
+ offsetof(XSegment, x2) == 4,
+ "XDrawSegments: Data alignment mix-up.");
+
+ memcpy (enqueue(dpy, d, gc, GL_LINES, count * 2), segments,
+ count * sizeof(XSegment));
}
- CGContextStrokePath (cgc);
- pop_gc (d, gc);
- invalidate_drawable_cache (d); */
+
return 0;
}
-int
-XClearWindow (Display *dpy, Window win)
+static int
+ClearWindow (Display *dpy, Window win)
{
Assert (win == dpy->main_window, "not a window");
- const XRectangle *wr = jwxyz_frame (win);
- /* TODO: Use glClear if there's no background pixmap. */
- return XClearArea (dpy, win, 0, 0, wr->width, wr->height, 0);
-}
-unsigned long
-jwxyz_window_background (Display *dpy)
-{
- return dpy->window_background;
+ jwxyz_gl_flush (dpy);
+ jwxyz_bind_drawable (dpy, win, win);
+
+ GLfloat color[4];
+ JWXYZ_QUERY_COLOR (dpy, dpy->window_background, 1.0f, color);
+
+ glClearColor (color[0], color[1], color[2], 1);
+ glClear (GL_COLOR_BUFFER_BIT);
+ return True;
}
-int
-XSetWindowBackground (Display *dpy, Window w, unsigned long pixel)
+static unsigned long *
+window_background (Display *dpy)
{
- Assert (w == dpy->main_window, "not a window");
- jwxyz_validate_pixel (dpy, pixel, visual_depth (NULL, NULL), False);
- dpy->window_background = pixel;
- return 0;
+ return &dpy->window_background;
}
-void
-jwxyz_fill_rects (Display *dpy, Drawable d, GC gc,
- const XRectangle *rectangles, unsigned long nrectangles,
- unsigned long pixel)
+static void
+fill_rects (Display *dpy, Drawable d, GC gc,
+ const XRectangle *rectangles, unsigned long nrectangles,
+ unsigned long pixel)
{
- jwxyz_bind_drawable (dpy, dpy->main_window, d);
- set_color_gc (dpy, gc, pixel);
+ set_color_gc (dpy, d, gc, pixel);
+
/*
glBegin(GL_QUADS);
for (unsigned i = 0; i != nrectangles; ++i) {
glVertex2i(r->x + r->width, r->y + r->height);
glVertex2i(r->x + r->width, r->y);
}
- glEnd(); */
+ glEnd();
+*/
glEnableClientState (GL_VERTEX_ARRAY);
glDisableClientState (GL_TEXTURE_COORD_ARRAY);
}
-int
-XClearArea (Display *dpy, Window win, int x, int y, int w, int h, Bool exp)
+static int
+FillPolygon (Display *dpy, Drawable d, GC gc,
+ XPoint *points, int npoints, int shape, int mode)
{
- Assert(win == dpy->main_window, "XClearArea: not a window");
- Assert(!exp, "XClearArea: exposures unsupported");
-
- jwxyz_fill_rect (dpy, win, 0, x, y, w, h, dpy->window_background);
- return 0;
-}
-
-
-int
-XFillPolygon (Display *dpy, Drawable d, GC gc,
- XPoint *points, int npoints, int shape, int mode)
-{
- jwxyz_bind_drawable (dpy, dpy->main_window, d);
- set_fg_gc(dpy, gc);
+ set_fg_gc(dpy, d, gc);
// TODO: Re-implement the GLU tesselation functions.
if (shape == Convex) {
- GLshort *vertices = malloc(npoints * sizeof(GLshort) * 2); // TODO: Oh look, another unchecked malloc.
- short v[2] = {0, 0};
+ GLshort *vertices = malloc(npoints * sizeof(GLshort) * 2); // TODO: Oh look, another unchecked malloc.
+ short v[2] = {0, 0};
- for (unsigned i = 0; i < npoints; i++) {
- next_point(v, points[i], mode);
- vertices[2 * i] = v[0];
- vertices[2 * i + 1] = v[1];
- }
+ for (unsigned i = 0; i < npoints; i++) {
+ next_point(v, points[i], mode);
+ vertices[2 * i] = v[0];
+ vertices[2 * i + 1] = v[1];
+ }
- glEnableClientState (GL_VERTEX_ARRAY);
- glDisableClientState (GL_TEXTURE_COORD_ARRAY);
-
- glVertexPointer (2, GL_SHORT, 0, vertices);
- glDrawArrays (GL_TRIANGLE_FAN, 0, npoints);
-
- free(vertices);
+ glEnableClientState (GL_VERTEX_ARRAY);
+ glDisableClientState (GL_TEXTURE_COORD_ARRAY);
+
+ glVertexPointer (2, GL_SHORT, 0, vertices);
+ glDrawArrays (GL_TRIANGLE_FAN, 0, npoints);
+
+ free(vertices);
} else if (shape == Nonconvex) {
- // TODO: assert that x,y of first and last point match, as that is assumed
+ // TODO: assert that x,y of first and last point match, as that is assumed
- linked_point *root;
- root = (linked_point *) malloc( sizeof(linked_point) );
- set_points_list(points,npoints,root);
- traverse_points_list(root);
+ linked_point *root;
+ root = (linked_point *) malloc( sizeof(linked_point) );
+ set_points_list(points,npoints,root);
+ traverse_points_list(root);
} else {
- Assert((shape == Convex || shape == Nonconvex), "XFillPolygon: (TODO) Unimplemented shape");
+ Assert((shape == Convex || shape == Nonconvex),
+ "XFillPolygon: (TODO) Unimplemented shape");
}
-
return 0;
}
return a < 0 ? (b - 1) - (-(a + 1) % b) : a % b;
}
+/* TODO: Fill in arcs with line width > 1 */
+static int
+draw_arc (Display *dpy, Drawable d, GC gc, int x, int y,
+ unsigned int width, unsigned int height,
+ int angle1, int angle2, Bool fill_p)
+{
+ int gglw = gc->gcv.line_width;
+
+ if (fill_p || gglw <= 1) {
+ draw_arc_gl (dpy, d, gc, x, y, width, height, angle1, angle2, fill_p);
+ }
+ else {
+ int w1, w2, h1, h2, gglwh;
+ w1 = width + gglw;
+ h1 = height + gglw;
+ h2 = height - gglw;
+ w2 = width - gglw;
+ gglwh = gglw / 2;
+ int x1 = x - gglwh;
+ int x2 = x + gglwh;
+ int y1 = y - gglwh;
+ int y2 = y + gglwh;
+ //draw_arc_gl (dpy, d, gc, x, y, width, height, angle1, angle2, fill_p);
+ draw_arc_gl (dpy, d, gc, x1, y1, w1, h1, angle1, angle2, fill_p);
+ draw_arc_gl (dpy, d, gc, x2, y2, w2, h2, angle1, angle2, fill_p);
+ }
+ return 0;
+}
+
+
int
-jwxyz_draw_arc (Display *dpy, Drawable d, GC gc, int x, int y,
- unsigned int width, unsigned int height,
- int angle1, int angle2, Bool fill_p)
+draw_arc_gl (Display *dpy, Drawable d, GC gc, int x, int y,
+ unsigned int width, unsigned int height,
+ int angle1, int angle2, Bool fill_p)
{
- jwxyz_bind_drawable (dpy, dpy->main_window, d);
- set_fg_gc(dpy, gc);
+ set_fg_gc(dpy, d, gc);
/* Let's say the number of line segments needed to make a convincing circle is
4*sqrt(radius). (But these arcs aren't necessarily circular arcs...) */
}
-XGCValues *
-jwxyz_gc_gcv (GC gc)
+static XGCValues *
+gc_gcv (GC gc)
{
return &gc->gcv;
}
-unsigned int
-jwxyz_gc_depth (GC gc)
+static unsigned int
+gc_depth (GC gc)
{
return gc->depth;
}
-GC
-XCreateGC (Display *dpy, Drawable d, unsigned long mask, XGCValues *xgcv)
+static GC
+CreateGC (Display *dpy, Drawable d, unsigned long mask, XGCValues *xgcv)
{
struct jwxyz_GC *gc = (struct jwxyz_GC *) calloc (1, sizeof(*gc));
gc->depth = jwxyz_drawable_depth (d);
}
-int
-XFreeGC (Display *dpy, GC gc)
+static int
+FreeGC (Display *dpy, GC gc)
{
if (gc->gcv.font)
XUnloadFont (dpy, gc->gcv.font);
}
-/*
-static void
-flipbits (unsigned const char *in, unsigned char *out, int length)
-{
- static const unsigned char table[256] = {
- 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
- 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
- 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
- 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
- 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
- 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
- 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
- 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
- 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
- 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
- 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
- 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
- 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
- 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
- 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
- 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
- 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
- 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
- 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
- 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
- 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
- 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
- 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
- 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
- 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
- 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
- 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
- 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
- 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
- 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
- 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
- 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
- };
- while (length-- > 0)
- *out++ = table[*in++];
-}
-*/
-
-
-int
-XPutImage (Display *dpy, Drawable d, GC gc, XImage *ximage,
- int src_x, int src_y, int dest_x, int dest_y,
- unsigned int w, unsigned int h)
+static int
+PutImage (Display *dpy, Drawable d, GC gc, XImage *ximage,
+ int src_x, int src_y, int dest_x, int dest_y,
+ unsigned int w, unsigned int h)
{
jwxyz_assert_display (dpy);
if (jwxyz_dumb_drawing_mode(dpy, d, gc, dest_x, dest_y, w, h))
return 0;
+ jwxyz_gl_flush (dpy);
jwxyz_bind_drawable (dpy, dpy->main_window, d);
+ jwxyz_gl_set_gc (dpy, gc);
+
int bpl = ximage->bytes_per_line;
int bpp = ximage->bits_per_pixel;
- /* int bsize = bpl * h; */
- char *data = ximage->data;
-/*
- CGRect r;
- r.origin.x = wr->x + dest_x;
- r.origin.y = wr->y + wr->height - dest_y - h;
- r.size.width = w;
- r.size.height = h;
-*/
+ char *tex_data;
+ unsigned src_w;
+ GLint tex_internalformat;
+ GLenum tex_format, tex_type;
- Assert (gc->gcv.function == GXcopy, "XPutImage: (TODO) GC function not supported");
- Assert (!gc->gcv.clip_mask, "XPutImage: (TODO) GC clip mask not supported");
-
if (bpp == 32) {
-
- /* Take advantage of the fact that it's ok for (bpl != w * bpp)
- to create a CGImage from a sub-rectagle of the XImage.
- */
- data += (src_y * bpl) + (src_x * 4);
+ tex_data = ximage->data + src_y * bpl + (src_x * 4);
jwxyz_assert_display(dpy);
/* There probably won't be any hacks that do this, but... */
Assert (!(bpl % 4), "XPutImage: bytes_per_line not divisible by four.");
- unsigned src_w = bpl / 4;
+ tex_internalformat = texture_internalformat(dpy);
+ tex_format = dpy->pixel_format;
+ tex_type = gl_pixel_type(dpy);
/* GL_UNPACK_ROW_LENGTH is not allowed to be negative. (sigh) */
# ifndef HAVE_JWZGLES
- glPixelStorei (GL_UNPACK_ROW_LENGTH, src_w);
src_w = w;
+ glPixelStorei (GL_UNPACK_ROW_LENGTH, src_w);
+# else
+ src_w = bpl / 4;
# endif
- glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
+ // glPixelStorei (GL_UNPACK_ALIGNMENT, 4); // Probably unnecessary.
-# if 1 // defined HAVE_JWZGLES
- // Regular OpenGL uses GL_TEXTURE_RECTANGLE_EXT in place of GL_TEXTURE_2D.
- // TODO: Make use of OES_draw_texture.
- // TODO: Coords might be wrong; things might be upside-down or backwards
- // or whatever.
-
- unsigned tex_w = src_w, tex_h = h;
- if (!dpy->gl_texture_npot_p) {
- tex_w = to_pow2(tex_w);
- tex_h = to_pow2(tex_h);
- }
+ set_white ();
+ } else {
+ Assert (bpp == 1, "expected 1 or 32 bpp");
+ Assert ((src_x % 8) == 0,
+ "XPutImage with non-byte-aligned 1bpp X offset not implemented");
- GLint internalformat = texture_internalformat(dpy);
+ const char *src_data = ximage->data + src_y * bpl + (src_x / 8);
+ unsigned w8 = (w + 7) / 8;
- glBindTexture (dpy->gl_texture_target, dpy->rect_texture);
+ src_w = w8 * 8;
- if (tex_w == src_w && tex_h == h) {
- glTexImage2D (dpy->gl_texture_target, 0, internalformat, tex_w, tex_h,
- 0, dpy->screen->pixel_format, gl_pixel_type(dpy), data);
- } else {
- // TODO: Sampling the last row might be a problem if src_x != 0.
- glTexImage2D (dpy->gl_texture_target, 0, internalformat, tex_w, tex_h,
- 0, dpy->screen->pixel_format, gl_pixel_type(dpy), NULL);
- glTexSubImage2D (dpy->gl_texture_target, 0, 0, 0, src_w, h,
- dpy->screen->pixel_format, gl_pixel_type(dpy), data);
+ tex_data = malloc(src_w * h);
+
+ uint32_t *data_out = (uint32_t *)tex_data;
+ for(unsigned y = h; y; --y) {
+ for(unsigned x = 0; x != w8; ++x) {
+ // TODO: Does big endian work here?
+ uint8_t byte = src_data[x];
+ uint32_t word = byte;
+ word = (word & 0x3) | ((word & 0xc) << 14);
+ word = (word & 0x00010001) | ((word & 0x00020002) << 7);
+ data_out[x << 1] = (word << 8) - word;
+
+ word = byte >> 4;
+ word = (word & 0x3) | ((word & 0xc) << 14);
+ word = (word & 0x00010001) | ((word & 0x00020002) << 7);
+ data_out[(x << 1) | 1] = (word << 8) - word;
+ }
+ src_data += bpl;
+ data_out += src_w / 4;
}
-
- set_white ();
- // glEnable (dpy->gl_texture_target);
- // glColor4f (0.5, 0, 1, 1);
- glEnable (dpy->gl_texture_target);
- glEnableClientState (GL_VERTEX_ARRAY);
- glEnableClientState (GL_TEXTURE_COORD_ARRAY);
- // TODO: Why are these ever turned on in the first place?
- glDisableClientState (GL_COLOR_ARRAY);
- glDisableClientState (GL_NORMAL_ARRAY);
- // glDisableClientState (GL_TEXTURE_COORD_ARRAY);
+ tex_internalformat = GL_LUMINANCE;
+ tex_format = GL_LUMINANCE;
+ tex_type = GL_UNSIGNED_BYTE;
- GLfloat vertices[4][2] =
- {
- {dest_x, dest_y},
- {dest_x, dest_y + h},
- {dest_x + w, dest_y + h},
- {dest_x + w, dest_y}
- };
+ // glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
+
+ set_color (dpy, gc->gcv.foreground, gc->depth, gc->gcv.alpha_allowed_p);
+ // TODO: Deal with the background color.
+ }
+
+# if 1 // defined HAVE_JWZGLES
+ // Regular OpenGL uses GL_TEXTURE_RECTANGLE_EXT in place of GL_TEXTURE_2D.
+ // TODO: Make use of OES_draw_texture.
+
+ unsigned tex_w = src_w, tex_h = h;
+ if (!dpy->gl_texture_npot_p) {
+ tex_w = to_pow2(tex_w);
+ tex_h = to_pow2(tex_h);
+ }
- GLfloat texcoord_w, texcoord_h;
+ glBindTexture (dpy->gl_texture_target, dpy->rect_texture);
+
+ // A fun project: reimplement xshm.c by means of a PBO using
+ // GL_MAP_UNSYNCHRONIZED_BIT.
+
+ // TODO: Would using glTexSubImage2D exclusively be faster?
+ if (tex_w == src_w && tex_h == h) {
+ glTexImage2D (dpy->gl_texture_target, 0, tex_internalformat, tex_w, tex_h,
+ 0, tex_format, tex_type, tex_data);
+ } else {
+ // TODO: Sampling the last row might be a problem if src_x != 0.
+ glTexImage2D (dpy->gl_texture_target, 0, tex_internalformat, tex_w, tex_h,
+ 0, tex_format, tex_type, NULL);
+ glTexSubImage2D (dpy->gl_texture_target, 0, 0, 0, src_w, h,
+ tex_format, tex_type, tex_data);
+ }
+
+ if (bpp == 1)
+ free(tex_data);
+
+ // TODO: This looks a lot like jwxyz_gl_draw_image. Refactor.
+
+ // glEnable (dpy->gl_texture_target);
+ // glColor4f (0.5, 0, 1, 1);
+ glEnable (dpy->gl_texture_target);
+ glEnableClientState (GL_VERTEX_ARRAY);
+ glEnableClientState (GL_TEXTURE_COORD_ARRAY);
+
+ // TODO: Why are these ever turned on in the first place?
+ glDisableClientState (GL_COLOR_ARRAY);
+ glDisableClientState (GL_NORMAL_ARRAY);
+ // glDisableClientState (GL_TEXTURE_COORD_ARRAY);
+
+ GLfloat vertices[4][2] =
+ {
+ {dest_x, dest_y},
+ {dest_x, dest_y + h},
+ {dest_x + w, dest_y + h},
+ {dest_x + w, dest_y}
+ };
+
+ GLfloat texcoord_w, texcoord_h;
# ifndef HAVE_JWZGLES
- if (dpy->gl_texture_target == GL_TEXTURE_RECTANGLE_EXT) {
- texcoord_w = w;
- texcoord_h = h;
- } else
+ if (dpy->gl_texture_target == GL_TEXTURE_RECTANGLE_EXT) {
+ texcoord_w = w;
+ texcoord_h = h;
+ } else
# endif /* HAVE_JWZGLES */
- {
- texcoord_w = (double)w / tex_w;
- texcoord_h = (double)h / tex_h;
- }
-
- GLfloat tex_coords[4][2];
- tex_coords[0][0] = 0;
- tex_coords[0][1] = 0;
- tex_coords[1][0] = 0;
- tex_coords[1][1] = texcoord_h;
- tex_coords[2][0] = texcoord_w;
- tex_coords[2][1] = texcoord_h;
- tex_coords[3][0] = texcoord_w;
- tex_coords[3][1] = 0;
-
- glVertexPointer (2, GL_FLOAT, 0, vertices);
- glTexCoordPointer (2, GL_FLOAT, 0, tex_coords);
-
- // Respect the alpha channel in the XImage if we're using alpha.
- if (gc->gcv.alpha_allowed_p) {
- glEnable (GL_BLEND);
- glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- }
+ {
+ texcoord_w = (double)w / tex_w;
+ texcoord_h = (double)h / tex_h;
+ }
- glDrawArrays (GL_TRIANGLE_FAN, 0, 4);
+ GLfloat tex_coords[4][2];
+ tex_coords[0][0] = 0;
+ tex_coords[0][1] = 0;
+ tex_coords[1][0] = 0;
+ tex_coords[1][1] = texcoord_h;
+ tex_coords[2][0] = texcoord_w;
+ tex_coords[2][1] = texcoord_h;
+ tex_coords[3][0] = texcoord_w;
+ tex_coords[3][1] = 0;
- if (gc->gcv.alpha_allowed_p)
- glDisable (GL_BLEND);
+ glVertexPointer (2, GL_FLOAT, 0, vertices);
+ glTexCoordPointer (2, GL_FLOAT, 0, tex_coords);
+ glDrawArrays (GL_TRIANGLE_FAN, 0, 4);
-// clear_texture();
- glDisable (dpy->gl_texture_target);
+//clear_texture();
+ glDisable (dpy->gl_texture_target);
# else
- glRasterPos2i (dest_x, dest_y);
- glPixelZoom (1, -1);
- jwxyz_assert_display (dpy);
- glDrawPixels (w, h, dpy->screen->pixel_format, gl_pixel_type(dpy), data);
+ glRasterPos2i (dest_x, dest_y);
+ glPixelZoom (1, -1);
+ jwxyz_assert_display (dpy);
+ glDrawPixels (w, h, dpy->pixel_format, gl_pixel_type(dpy), data);
# endif
- } else { // (bpp == 1)
-
- // Assert(FALSE, "XPutImage: TODO");
- // Check out ximage_(get|put)pixel_1
-
-#if 0
- /* To draw a 1bpp image, we use it as a mask and fill two rectangles.
-
- #### However, the bit order within a byte in a 1bpp XImage is
- the wrong way around from what Quartz expects, so first we
- have to copy the data to reverse it. Shit! Maybe it
- would be worthwhile to go through the hacks and #ifdef
- each one that diddles 1bpp XImage->data directly...
- */
- Assert ((src_x % 8) == 0,
- "XPutImage with non-byte-aligned 1bpp X offset not implemented");
- data += (src_y * bpl) + (src_x / 8); // move to x,y within the data
- unsigned char *flipped = (unsigned char *) malloc (bsize);
-
- flipbits ((unsigned char *) data, flipped, bsize);
-
- CGDataProviderRef prov =
- CGDataProviderCreateWithData (NULL, flipped, bsize, NULL);
- CGImageRef mask = CGImageMaskCreate (w, h,
- 1, bpp, bpl,
- prov,
- NULL, /* decode[] */
- GL_FALSE); /* interpolate */
- push_fg_gc (dpy, d, gc, GL_TRUE);
-
- CGContextFillRect (cgc, r); // foreground color
- CGContextClipToMask (cgc, r, mask);
- set_color (dpy, cgc, gc->gcv.background, gc->depth, GL_FALSE, GL_TRUE);
- CGContextFillRect (cgc, r); // background color
- pop_gc (d, gc);
-
- free (flipped);
- CGDataProviderRelease (prov);
- CGImageRelease (mask);
-#endif
- }
-
jwxyz_assert_gl ();
- invalidate_drawable_cache (d);
return 0;
}
/* #### Twang calls XGetImage on the window intending to get a
buffer full of black. This is returning a buffer full of white
instead of black for some reason. */
-XImage *
-XGetSubImage (Display *dpy, Drawable d, int x, int y,
- unsigned int width, unsigned int height,
- unsigned long plane_mask, int format,
- XImage *dest_image, int dest_x, int dest_y)
+static XImage *
+GetSubImage (Display *dpy, Drawable d, int x, int y,
+ unsigned int width, unsigned int height,
+ unsigned long plane_mask, int format,
+ XImage *dest_image, int dest_x, int dest_y)
{
Assert ((width < 65535), "improbably large width");
Assert ((height < 65535), "improbably large height");
Assert ((x < 65535 && x > -65535), "improbably large x");
Assert ((y < 65535 && y > -65535), "improbably large y");
+ jwxyz_gl_flush (dpy);
jwxyz_bind_drawable (dpy, dpy->main_window, d);
// TODO: What if this reads off the edge? What is supposed to happen?
uint32_t *dest_data = (uint32_t *)dest_image->data + pixels_per_line * dest_y + dest_x;
glReadPixels (x, jwxyz_frame (d)->height - (y + height), width, height,
- dpy->screen->pixel_format, gl_pixel_type(dpy), dest_data);
+ dpy->pixel_format, gl_pixel_type(dpy), dest_data);
/* Flip this upside down. :( */
uint32_t *top = dest_data;
}
-/* Returns a transformation matrix to do rotation as per the provided
- EXIF "Orientation" value.
- */
-/*
-static CGAffineTransform
-exif_rotate (int rot, CGSize rect)
-{
- CGAffineTransform trans = CGAffineTransformIdentity;
- switch (rot) {
- case 2: // flip horizontal
- trans = CGAffineTransformMakeTranslation (rect.width, 0);
- trans = CGAffineTransformScale (trans, -1, 1);
- break;
-
- case 3: // rotate 180
- trans = CGAffineTransformMakeTranslation (rect.width, rect.height);
- trans = CGAffineTransformRotate (trans, M_PI);
- break;
-
- case 4: // flip vertical
- trans = CGAffineTransformMakeTranslation (0, rect.height);
- trans = CGAffineTransformScale (trans, 1, -1);
- break;
-
- case 5: // transpose (UL-to-LR axis)
- trans = CGAffineTransformMakeTranslation (rect.height, rect.width);
- trans = CGAffineTransformScale (trans, -1, 1);
- trans = CGAffineTransformRotate (trans, 3 * M_PI / 2);
- break;
-
- case 6: // rotate 90
- trans = CGAffineTransformMakeTranslation (0, rect.width);
- trans = CGAffineTransformRotate (trans, 3 * M_PI / 2);
- break;
-
- case 7: // transverse (UR-to-LL axis)
- trans = CGAffineTransformMakeScale (-1, 1);
- trans = CGAffineTransformRotate (trans, M_PI / 2);
- break;
-
- case 8: // rotate 270
- trans = CGAffineTransformMakeTranslation (rect.height, 0);
- trans = CGAffineTransformRotate (trans, M_PI / 2);
- break;
-
- default:
- break;
- }
-
- return trans;
-}
-*/
-
-void
-jwxyz_draw_NSImage_or_CGImage (Display *dpy, Drawable d,
- Bool nsimg_p, void *img_arg,
- XRectangle *geom_ret, int exif_rotation)
-{
- Assert (False, "jwxyz_draw_NSImage_or_CGImage: TODO stub");
-#if 0
- CGImageRef cgi;
-# ifndef USE_IPHONE
- CGImageSourceRef cgsrc;
-# endif // USE_IPHONE
- NSSize imgr;
-
- CGContextRef cgc = d->cgc;
-
- if (nsimg_p) {
-
- NSImage *nsimg = (NSImage *) img_arg;
- imgr = [nsimg size];
-
-# ifndef USE_IPHONE
- // convert the NSImage to a CGImage via the toll-free-bridging
- // of NSData and CFData...
- //
- NSData *nsdata = [NSBitmapImageRep
- TIFFRepresentationOfImageRepsInArray:
- [nsimg representations]];
- CFDataRef cfdata = (CFDataRef) nsdata;
- cgsrc = CGImageSourceCreateWithData (cfdata, NULL);
- cgi = CGImageSourceCreateImageAtIndex (cgsrc, 0, NULL);
-# else // USE_IPHONE
- cgi = nsimg.CGImage;
-# endif // USE_IPHONE
-
- } else {
- cgi = (CGImageRef) img_arg;
- imgr.width = CGImageGetWidth (cgi);
- imgr.height = CGImageGetHeight (cgi);
- }
-
- Bool rot_p = (exif_rotation >= 5);
-
- if (rot_p)
- imgr = NSMakeSize (imgr.height, imgr.width);
-
- CGRect winr = d->frame;
- float rw = winr.size.width / imgr.width;
- float rh = winr.size.height / imgr.height;
- float r = (rw < rh ? rw : rh);
-
- CGRect dst, dst2;
- dst.size.width = imgr.width * r;
- dst.size.height = imgr.height * r;
- dst.origin.x = (winr.size.width - dst.size.width) / 2;
- dst.origin.y = (winr.size.height - dst.size.height) / 2;
-
- dst2.origin.x = dst2.origin.y = 0;
- if (rot_p) {
- dst2.size.width = dst.size.height;
- dst2.size.height = dst.size.width;
- } else {
- dst2.size = dst.size;
- }
-
- // Clear the part not covered by the image to background or black.
- //
- if (d->type == WINDOW)
- XClearWindow (dpy, d);
- else {
- jwxyz_fill_rect (dpy, d, 0, 0, 0, winr.size.width, winr.size.height,
- drawable_depth (d) == 1 ? 0 : BlackPixel(dpy,0));
- }
-
- CGAffineTransform trans =
- exif_rotate (exif_rotation, rot_p ? dst2.size : dst.size);
-
- CGContextSaveGState (cgc);
- CGContextConcatCTM (cgc,
- CGAffineTransformMakeTranslation (dst.origin.x,
- dst.origin.y));
- CGContextConcatCTM (cgc, trans);
- //Assert (CGImageGetColorSpace (cgi) == dpy->colorspace, "bad colorspace");
- CGContextDrawImage (cgc, dst2, cgi);
- CGContextRestoreGState (cgc);
-
-# ifndef USE_IPHONE
- if (nsimg_p) {
- CFRelease (cgsrc);
- CGImageRelease (cgi);
- }
-# endif // USE_IPHONE
-
- if (geom_ret) {
- geom_ret->x = dst.origin.x;
- geom_ret->y = dst.origin.y;
- geom_ret->width = dst.size.width;
- geom_ret->height = dst.size.height;
- }
-
- invalidate_drawable_cache (d);
-#endif
-}
-
-#ifndef HAVE_JWZGLES
-
-/*
-static void
-create_rectangle_texture (GLuint *texture)
-{
- glGenTextures(1, texture);
- glBindTexture(GL_TEXTURE_RECTANGLE_EXT, *texture);
- glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-}
-*/
-
-#endif
-
-
#if 0
static Pixmap
copy_pixmap (Display *dpy, Pixmap p)
#endif
-int
-jwxyz_draw_string (Display *dpy, Drawable d, GC gc, int x, int y,
- const char *str, size_t len, int utf8_p)
+static int
+SetClipMask (Display *dpy, GC gc, Pixmap m)
{
- Font ff = gc->gcv.font;
- XCharStruct cs;
-
- char *data = 0;
- jwxyz_render_text (dpy, jwxyz_native_font (ff), str, len, utf8_p, &cs, &data);
- int w = cs.rbearing - cs.lbearing;
- int h = cs.ascent + cs.descent;
-
- if (w < 0 || h < 0) abort();
- if (w == 0 || h == 0) {
- if (data) free(data);
- return 0;
- }
-
- XImage *img = XCreateImage (dpy, dpy->screen->visual, 32,
- ZPixmap, 0, data, w, h, 0, 0);
-
- /* The image of text is a 32-bit image, in white.
- Take the red channel for intensity and use that as alpha.
- replace RGB with the GC's foreground color.
- This expects that XPutImage respects alpha and only writes
- the bits that are not masked out.
- This also assumes that XPutImage expects ARGB.
+ Log ("TODO: No clip masks yet");
+ /* Protip: Do glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+ clearing just the stencil buffer in a packed depth/stencil arrangement is
+ slower than the above. Adreno recommends this, but other GPUs probably
+ benefit as well.
*/
- {
- char *s = data;
- char *end = s + (w * h * 4);
- uint8_t rgba[4];
- jwxyz_query_color (dpy, gc->gcv.foreground, rgba);
- while (s < end) {
-
- s[3] = s[1];
- s[0] = rgba[0];
- s[1] = rgba[1];
- s[2] = rgba[2];
- s += 4;
- }
- }
-
- {
- Bool old_alpha = gc->gcv.alpha_allowed_p;
- jwxyz_XSetAlphaAllowed (dpy, gc, True);
- XPutImage (dpy, d, gc, img, 0, 0,
- x + cs.lbearing,
- y - cs.ascent,
- w, h);
- jwxyz_XSetAlphaAllowed (dpy, gc, old_alpha);
- XDestroyImage (img);
- }
-
- return 0;
-}
-
-
-int
-XSetClipMask (Display *dpy, GC gc, Pixmap m)
-{
-//#### abort();
-/*
- TODO
-
- Assert (!!gc->gcv.clip_mask == !!gc->clip_mask, "GC clip mask mixup");
-
- if (gc->gcv.clip_mask) {
- XFreePixmap (dpy, gc->gcv.clip_mask);
- CGImageRelease (gc->clip_mask);
- }
-
- gc->gcv.clip_mask = copy_pixmap (dpy, m);
- if (gc->gcv.clip_mask)
- gc->clip_mask =
- CGBitmapContextCreateImage (gc->gcv.clip_mask->cgc);
- else
- gc->clip_mask = 0;
-*/
-
return 0;
}
-int
-XSetClipOrigin (Display *dpy, GC gc, int x, int y)
+static int
+SetClipOrigin (Display *dpy, GC gc, int x, int y)
{
gc->gcv.clip_x_origin = x;
gc->gcv.clip_y_origin = y;
}
+const struct jwxyz_vtbl gl_vtbl = {
+ root,
+ visual,
+ display_sources_data,
+
+ window_background,
+ draw_arc,
+ fill_rects,
+ gc_gcv,
+ gc_depth,
+ jwxyz_draw_string,
+
+ jwxyz_gl_copy_area,
+
+ DrawPoints,
+ DrawSegments,
+ CreateGC,
+ FreeGC,
+ ClearWindow,
+ SetClipMask,
+ SetClipOrigin,
+ FillPolygon,
+ DrawLines,
+ PutImage,
+ GetSubImage
+};
#endif /* JWXYZ_GL -- entire file */
projects / xscreensaver / blobdiff