+++ /dev/null
-#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)b_draw.c 4.11 98/06/16 xlockmore";
-
-#endif
-
-/*-
- * BUBBLE3D (C) 1998 Richard W.M. Jones.
- * b_draw.c: This code creates new bubbles, manages them and controls
- * them as they are drawn on the screen.
- */
-
-#include "bubble3d.h"
-
-typedef struct draw_context {
- /* The list of bubbles currently on the screen. */
- void **bubble_list;
- int nr_bubbles;
-
- /* When was the last time we created a new bubble? */
- int bubble_count;
-} draw_context;
-
-void *
-glb_draw_init(void)
-{
- draw_context *c;
-
- GLfloat mat_specular[] =
- {1, 1, 1, 1};
- GLfloat mat_emission[] =
- {0, 0, 0, 1};
- GLfloat mat_shininess[] =
- {100};
- GLfloat ambient[] =
- {0.5, 0.5, 0.5, 1.0};
- GLfloat light_position[][4] =
- {
- {0, -1, 0, 0},
- {1, 1, 0, 0},
- {-1, 0, 1, 0}};
- GLfloat light_diffuse[][4] =
- {
- {1, 1, 1, 1},
- {1, 1, 1, 1},
- {1, 1, 1, 1}};
- GLfloat light_specular[][4] =
- {
- {1, 1, 1, 1},
- {1, 1, 1, 1},
- {1, 1, 1, 1}};
-
- /* Initialize the context. */
- c = (struct draw_context *) malloc(sizeof (struct draw_context));
-
- if (c == 0)
- return 0;
- c->bubble_list = 0;
- c->nr_bubbles = 0;
- c->bubble_count = glb_config.create_bubbles_every;
-
- /* Do some GL initialization. */
- glClearColor(glb_config.bg_colour[0],
- glb_config.bg_colour[1],
- glb_config.bg_colour[2],
- glb_config.bg_colour[3]);
-#if 0
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, glb_config.bubble_colour);
-#else
- {
- /*
- * E. Lassauge - 98/06/29
- * Yeahh, cool ! Now that I know how to have random colors I
- * patch this pretty beautiful mode too !!
- */
- GLfloat fred, fgreen, fblue;
- GLfloat params[4];
-
- fred = ((float) (NRAND(100)) / 100.0);
- fgreen = ((float) (NRAND(100)) / 100.0);
- /* I keep more blue */
- fblue = ((float) (NRAND(50)) / 100.0) + 0.50;
-
- params[0] = fred;
- params[1] = fgreen;
- params[2] = fblue;
- /* For the moment don't play with ALPHA channel */
- params[3] = glb_config.bubble_colour[3];
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, params);
- }
-#endif
- glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mat_specular);
- glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, mat_emission);
- glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mat_shininess);
-
-#if GLB_USE_BLENDING
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-#endif
-
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glEnable(GL_LIGHT1);
- glEnable(GL_LIGHT2);
-#if GLB_USE_BLENDING
- glEnable(GL_BLEND);
-#else
- glEnable(GL_DEPTH_TEST);
-#endif
- glEnable(GL_AUTO_NORMAL);
- glEnable(GL_NORMALIZE);
-
-#if GLB_USE_BLENDING
- glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
-#endif
- glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
- glLightfv(GL_LIGHT0, GL_POSITION, light_position[0]);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse[0]);
- glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular[0]);
- glLightfv(GL_LIGHT1, GL_POSITION, light_position[1]);
- glLightfv(GL_LIGHT1, GL_DIFFUSE, light_diffuse[1]);
- glLightfv(GL_LIGHT1, GL_SPECULAR, light_specular[1]);
- glLightfv(GL_LIGHT2, GL_POSITION, light_position[2]);
- glLightfv(GL_LIGHT2, GL_DIFFUSE, light_diffuse[2]);
- glLightfv(GL_LIGHT2, GL_SPECULAR, light_specular[2]);
-
- return c;
-}
-
-static void
-delete_bubble(draw_context * c, int j)
-{
- int i;
-
- glb_bubble_delete(c->bubble_list[j]);
-
- for (i = j; i < c->nr_bubbles - 1; ++i)
- c->bubble_list[i] = c->bubble_list[i + 1];
-
- c->nr_bubbles--;
-}
-
-void
-glb_draw_end(void *cc)
-{
- draw_context *c = (draw_context *) cc;
- int i;
-
- for (i = 0; i < c->nr_bubbles; ++i) {
- delete_bubble(c, i);
- i--;
- }
- (void) free((void *) c->bubble_list);
- (void) free((void *) c);
-}
-
-static int
-create_new_bubbles(draw_context * c)
-{
- int n, i;
- double r = glb_drand();
- GLfloat size, speed, scale_incr, x, y, z;
- void *b[4];
- void **old_bubble_list;
-
- /* How many bubbles to make? */
- if (r < glb_config.p_bubble_group[0])
- n = 1;
- else if (r < glb_config.p_bubble_group[1])
- n = 2;
- else if (r < glb_config.p_bubble_group[2])
- n = 3;
- else
- n = 4;
-
- /* Initial position of top-most bubble in group. */
- x = glb_drand() * 4 - 2;
- y = glb_config.screen_bottom;
- z = glb_drand() * 2 - 2;
-
- /* What size? */
- size = glb_config.min_size
- + glb_drand() * (glb_config.max_size - glb_config.min_size);
-
- /* What speed? */
- speed = glb_config.min_speed
- + glb_drand() * (glb_config.max_speed - glb_config.min_speed);
-
- /* Work out the scaling increment. Bubbles should increase by scale_factor
- * as they go from bottom to top of screen.
- */
- scale_incr = (size * glb_config.scale_factor - size)
- / ((glb_config.screen_top - glb_config.screen_bottom) / speed);
-
- /* Create the bubble(s). */
- for (i = 0; i < n; ++i) {
- if ((b[i] = glb_bubble_new(x, y, z, size, speed, scale_incr)) == 0) {
- /* Out of memory - recover. */
- i--;
- while (i >= 0)
- glb_bubble_delete(b[i]);
- return 0;
- }
- /* Create the next bubble below the last bubble. */
- y -= size * 3;
- }
-
- /* Add the bubbles to the list. */
- c->nr_bubbles += n;
- old_bubble_list = c->bubble_list;
- if (c->bubble_list == 0) {
- c->bubble_list = (void **) malloc(c->nr_bubbles * sizeof (void *));
- } else {
- c->bubble_list = (void **) realloc(c->bubble_list,
- c->nr_bubbles * sizeof (void *));
- }
-
- if (c->bubble_list == 0) {
- /* Out of memory - recover. */
- for (i = 0; i < n; ++i)
- glb_bubble_delete(b[i]);
- c->bubble_list = old_bubble_list;
- c->nr_bubbles -= n;
- return 0;
- }
- for (i = 0; i < n; ++i)
- c->bubble_list[c->nr_bubbles - i - 1] = b[i];
-
- return 1;
-}
-
-void
-glb_draw_step(void *cc)
-{
- draw_context *c = (draw_context *) cc;
- int i;
-
- /* Consider creating a new bubble or bubbles. */
- if (c->nr_bubbles < glb_config.max_bubbles &&
- c->bubble_count++ > glb_config.create_bubbles_every) {
- if (create_new_bubbles(c))
- c->bubble_count = 0;
- }
- /* Clear the display. */
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
- /* XXX Draw the background here ... */
-
- /* Draw all the bubbles on the display. */
- for (i = 0; i < c->nr_bubbles; ++i) {
- void *b = c->bubble_list[i];
-
- glb_bubble_step(b);
- glb_bubble_draw(b);
-
- /* Has the bubble reached the top of the screen? */
- if (glb_bubble_get_y(b) >= glb_config.screen_top) {
- delete_bubble(c, i);
- i--;
- }
- }
-}
projects / xscreensaver / blobdiff