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/* Example of AllegroGL's masked texture routines */
#include "allegro.h"
#include "alleggl.h"
#include "running.h"
volatile int chrono = 0;
void the_timer(void) {
chrono++;
} END_OF_FUNCTION(the_timer);
int render_time;
int main() {
BITMAP *texture;
DATAFILE *dat;
GLuint tex[11];
int i = 0, j;
allegro_init();
install_allegro_gl();
install_keyboard();
install_mouse();
allegro_gl_clear_settings();
allegro_gl_set(AGL_COLOR_DEPTH, 32);
allegro_gl_set(AGL_DOUBLEBUFFER, 1);
allegro_gl_set(AGL_Z_DEPTH, 24);
allegro_gl_set(AGL_WINDOWED, TRUE);
allegro_gl_set(AGL_RENDERMETHOD, 1);
allegro_gl_set(AGL_SUGGEST, AGL_COLOR_DEPTH | AGL_DOUBLEBUFFER
| AGL_RENDERMETHOD | AGL_Z_DEPTH | AGL_WINDOWED);
if (set_gfx_mode(GFX_OPENGL, 640, 480, 0, 0)) {
allegro_message ("Error setting OpenGL graphics mode:\n%s\n"
"Allegro GL error : %s\n",
allegro_error, allegro_gl_error);
return -1;
}
install_timer();
LOCK_FUNCTION(the_timer);
LOCK_VARIABLE(chrono);
install_int(the_timer, 10);
dat = load_datafile("running.dat");
if (!dat) {
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
allegro_message("Unable to load running.dat!\n");
return -2;
}
allegro_gl_use_mipmapping(TRUE);
/* Convert running ball thingie */
for (j = 0; j < 10; j++) {
BITMAP *bmp = dat[FRAME_00_BMP + j].dat;
tex[j] = allegro_gl_make_masked_texture(bmp);
}
/* Convert Mysha */
texture = load_bitmap("mysha.pcx", NULL);
if (!texture) {
unload_datafile(dat);
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
allegro_message("Unable to load mysha.pcx - did you copy Allegro's "
"here?\n");
return -3;
}
tex[10] = allegro_gl_make_texture(texture);
/* Now display everything */
/* Setup OpenGL like we want */
glEnable(GL_TEXTURE_2D);
/* Skip pixels which alpha channel is lower than 0.5*/
glAlphaFunc(GL_GREATER, 0.5);
glShadeModel(GL_FLAT);
glPolygonMode(GL_FRONT, GL_FILL);
glViewport(0, 0, SCREEN_W, SCREEN_H);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -1.0, 1.0, 1, 60.0);
/* Set culling mode - not that we have anything to cull */
glEnable(GL_CULL_FACE);
glFrontFace(GL_CCW);
glMatrixMode(GL_MODELVIEW);
while (keypressed()) readkey();
render_time = chrono;
do {
int screen_w = SCREEN_W;
int screen_h = SCREEN_H;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-10.0, -10.0, -10.0);
/* Draw BG */
glBindTexture(GL_TEXTURE_2D, tex[10]);
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex2f(0, 0);
glTexCoord2f(1, 0);
glVertex2f(20, 0);
glTexCoord2f(1, 1);
glVertex2f(20, 20);
glTexCoord2f(0, 1);
glVertex2f(0, 20);
glEnd();
i = (chrono / 10) % 10;
/* Draw running ball thingie */
/* Enable removing of thingie's transparent pixels */
glEnable(GL_ALPHA_TEST);
glLoadIdentity();
if (screen_w != 0 && screen_h != 0) {
glTranslatef(mouse_x * 20.0 / screen_w - 10.0,
mouse_y * -20.0 / screen_h + 10.0, -9.99);
}
glRotatef(chrono, 0, 0, 1.0);
glBindTexture(GL_TEXTURE_2D, tex[i]);
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex2f(-1.0, -1.0);
glTexCoord2f(1, 0);
glVertex2f(1.0, -1.0);
glTexCoord2f(1, 1);
glVertex2f(1.0, 1.0);
glTexCoord2f(0, 1);
glVertex2f(-1.0, 1.0);
glEnd();
glDisable(GL_ALPHA_TEST); /* Disable removing of transparent pixels */
allegro_gl_flip();
render_time++;
while (!keypressed() && render_time > chrono) {
rest(2);
}
} while (!keypressed());
return 0;
}
END_OF_MAIN()
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