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#include <allegro.h>
#include <alleggl.h>
#define MAX_IMAGES 256
/* structure to hold the current position and velocity of an image */
typedef struct IMAGE
{
float x, y;
float dx, dy;
} IMAGE;
int blender = 0;
char *blender_name = "alpha";
/* initialises an image structure to a random position and velocity */
void init_image(IMAGE *image)
{
image->x = (float)(AL_RAND() % 704);
image->y = (float)(AL_RAND() % 568);
image->dx = (float)((AL_RAND() % 255) - 127) / 32.0;
image->dy = (float)((AL_RAND() % 255) - 127) / 32.0;
}
volatile int chrono = 0;
void the_timer(void) {
chrono++;
} END_OF_FUNCTION(the_timer);
/* called once per frame to bounce an image around the screen */
void update_image(IMAGE *image)
{
image->x += image->dx;
image->y += image->dy;
if (((image->x < 0) && (image->dx < 0)) ||
((image->x > SCREEN_W-300) && (image->dx > 0)))
image->dx *= -1;
if (((image->y < 0) && (image->dy < 0)) ||
((image->y > SCREEN_H-200) && (image->dy > 0)))
image->dy *= -1;
}
int main(int argc, char *argv[])
{
BITMAP *tmp, *image;
BITMAP *vimage;
PALETTE pal;
FONT *agl_font;
IMAGE images[MAX_IMAGES];
int num_images = 4;
int done = FALSE;
int i, x, y;
int frame_count = 0, frame_count_time = 0;
float fps_rate = 0.0;
if (allegro_init() != 0)
return 1;
if (install_allegro_gl() != 0)
return 1;
install_keyboard();
install_timer();
LOCK_FUNCTION(the_timer);
LOCK_VARIABLE(chrono);
install_int(the_timer, 5);
allegro_gl_set(AGL_DOUBLEBUFFER, 1);
allegro_gl_set(AGL_WINDOWED, TRUE);
allegro_gl_set(AGL_COLOR_DEPTH, 32);
allegro_gl_set(AGL_SUGGEST, AGL_DOUBLEBUFFER | AGL_WINDOWED | AGL_COLOR_DEPTH);
if(set_gfx_mode(GFX_OPENGL, 800, 600, 0, 0)) {
allegro_message ("Error setting OpenGL graphics mode:\n%s\n"
"Allegro GL error : %s\n",
allegro_error, allegro_gl_error);
exit(0);
}
/* Convert Allegro font */
agl_font = allegro_gl_convert_allegro_font_ex(font,
AGL_FONT_TYPE_TEXTURED, -1.0, GL_INTENSITY8);
/* read in the source graphic */
set_color_conversion(COLORCONV_NONE);
tmp = load_bitmap("mysha.pcx", pal);
set_palette(pal);
image = create_bitmap_ex(32, tmp->w, tmp->h);
blit(tmp, image, 0, 0, 0, 0, tmp->w, tmp->h);
/* Generate alpha channel from greyscale of the image. */
for (y = 0; y < image->h; ++y) {
for (x = 0; x < image->w; ++x){
int col = _getpixel32(image, x, y);
int a = getr32(col) + getg32(col) + getb32(col);
a = MID(0, a/2-128, 255);
_putpixel32(image, x, y, makeacol32(getr32(col), getg32(col), getb32(col), a));
}
}
/* initialise the images to random positions */
for (i=0; i<MAX_IMAGES; i++)
init_image(images+i);
/* create a video memory bitmap to store our picture */
allegro_gl_set_video_bitmap_color_depth(32);
vimage = create_video_bitmap(image->w, image->h);
blit(image, vimage, 0, 0, 0, 0, image->w, image->h);
set_alpha_blender();
allegro_gl_set_projection();
glMatrixMode(GL_MODELVIEW);
while (!done) {
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();
/* Draw background pattern. */
for (y = 0; y < SCREEN_H; y += 50) {
for (x = 0; x < SCREEN_W; x += 50) {
int sx = (x / 50) & 1;
int sy = (y / 50) & 1;
float c = sx ^ sy;
glColor3f(c, c, c);
glBegin(GL_QUADS);
glVertex2d(x, y);
glVertex2d(x + 50, y);
glVertex2d(x + 50, y + 50);
glVertex2d(x, y + 50);
glEnd();
}
}
/* draw onto screen */
for (i=0; i<num_images; i++)
draw_trans_sprite(screen, vimage, images[i].x, images[i].y);
/* deal with keyboard input */
while (keypressed()) {
switch (readkey()>>8) {
case KEY_UP:
case KEY_RIGHT:
if (num_images < MAX_IMAGES)
num_images++;
break;
case KEY_DOWN:
case KEY_LEFT:
if (num_images > 0)
num_images--;
break;
case KEY_SPACE:
if (blender < 6)
blender++;
else
blender = 0;
switch (blender) {
case 0:
set_alpha_blender();
blender_name = "alpha";
break;
case 1:
set_trans_blender(128, 128, 128, 128);
blender_name = "trans";
break;
case 2:
set_add_blender(128, 128, 128, 128);
blender_name = "add";
break;
case 3:
set_burn_blender(128, 128, 128, 128);
blender_name = "burn";
break;
case 4:
set_dodge_blender(128, 128, 128, 128);
blender_name = "dodge";
break;
case 5:
set_invert_blender(128, 128, 128, 128);
blender_name = "invert";
break;
case 6:
set_multiply_blender(128, 128, 128, 128);
blender_name = "multiply";
break;
}
break;
case KEY_ESC:
done = TRUE;
break;
}
}
/* bounce the images around the screen */
for (i=0; i<num_images; i++)
update_image(images+i);
/* calculate and display framerate */
frame_count++;
if (frame_count >= 20) {
if (chrono > frame_count_time)
fps_rate = frame_count * 200.0 / (chrono - frame_count_time);
else
fps_rate = frame_count * 200.0;
frame_count_time = chrono;
frame_count = 0;
}
glBegin(GL_QUADS);
glColor3ub(0, 0, 0);
glVertex2f(0, 0);
glVertex2f(0, 50);
glVertex2f(300, 50);
glVertex2f(300, 0);
glEnd();
glEnable(GL_TEXTURE_2D);
allegro_gl_printf(agl_font, 0, 0, 0, makecol(255, 255, 255), "FPS: %.2f", fps_rate);
allegro_gl_printf(agl_font, 0, 10, 0, makecol(255, 255, 255), "image count: %i (arrow keys to change)", num_images);
allegro_gl_printf(agl_font, 0, 20, 0, makecol(255, 255, 255), "using %s blender (space key to change)", blender_name);
glDisable(GL_TEXTURE_2D);
allegro_gl_flip();
}
destroy_bitmap(tmp);
destroy_bitmap(image);
destroy_bitmap(vimage);
destroy_font(agl_font);
return 0;
}
END_OF_MAIN()
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