X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=sdlpixels.c;fp=sdlpixels.c;h=46d075d90e45e1b7557972e4c3f4ef3ed4e7eaf9;hb=e1c0a3963cd5ce16b614e9e060bd0468f3aa01f1;hp=0000000000000000000000000000000000000000;hpb=fcb01b3da1a4bc51482e67b88b7c59dc5c8b7578;p=glpixels

diff --git a/sdlpixels.c b/sdlpixels.c
new file mode 100644
index 0000000..46d075d
--- /dev/null
+++ b/sdlpixels.c
@@ -0,0 +1,126 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <SDL/SDL.h>
+
+int init(void);
+void display(void);
+
+int win_width, win_height;
+int max_xscroll, max_yscroll;
+
+#define IMG_W	1400
+#define IMG_H	1200
+unsigned int img[IMG_W * IMG_H];
+
+unsigned int start_tm;
+unsigned int num_frames;
+
+int quit;
+SDL_Surface *fbsurf;
+
+
+int main(int argc, char **argv)
+{
+	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER);
+	if(!(fbsurf = SDL_SetVideoMode(800, 600, 32, SDL_SWSURFACE))) {
+		fprintf(stderr, "failed to set video mode\n");
+		return 1;
+	}
+	SDL_WM_SetCaption("SDL pixel drawing benchmark", 0);
+
+	if(init() == -1) {
+		return 1;
+	}
+
+	start_tm = SDL_GetTicks();
+	while(!quit) {
+		SDL_Event ev;
+		while(SDL_PollEvent(&ev)) {
+			switch(ev.type) {
+			case SDL_QUIT:
+				goto done;
+
+			case SDL_KEYDOWN:
+				if(ev.key.keysym.sym == 27) goto done;
+				break;
+
+			default:
+				break;
+			}
+			if(quit) goto done;
+		}
+
+		display();
+	}
+
+done:
+	SDL_Quit();
+	return 0;
+}
+
+
+int init(void)
+{
+	int i, j, xor, r, g, b;
+	unsigned int *ptr;
+
+	ptr = img;
+	for(i=0; i<IMG_H; i++) {
+		for(j=0; j<IMG_W; j++) {
+			xor = i ^ j;
+			r = (xor >> 1) & 0xff;
+			g = xor & 0xff;
+			b = (xor << 1) & 0xff;
+			*ptr++ = b | (g << 8) | (r << 16);
+		}
+	}
+
+	win_width = 800;
+	win_height = 600;
+
+	max_xscroll = IMG_W - win_width;
+	max_yscroll = IMG_H - win_height;
+	return 0;
+}
+
+void display(void)
+{
+	int i, j;
+	unsigned int tm = SDL_GetTicks() - start_tm;
+	unsigned int interv;
+	float t = tm / 256.0f;
+	int xoffs = (int)((sin(t) * 0.5f + 0.5f) * max_xscroll);
+	int yoffs = (int)((cos(t) * 0.5f + 0.5f) * max_yscroll);
+	unsigned int *start = img + yoffs * IMG_W + xoffs;
+	unsigned int *dest;
+
+	if(SDL_MUSTLOCK(fbsurf)) {
+		SDL_LockSurface(fbsurf);
+	}
+	dest = fbsurf->pixels;
+
+	for(i=0; i<win_height; i++) {
+		for(j=0; j<win_width; j++) {
+			*dest++ = start[j];
+		}
+		start += IMG_W;
+	}
+
+	if(SDL_MUSTLOCK(fbsurf)) {
+		SDL_UnlockSurface(fbsurf);
+	}
+	SDL_Flip(fbsurf);
+
+	num_frames++;
+	tm = SDL_GetTicks();
+	interv = tm - start_tm;
+	if(interv >= 4000) {
+		unsigned int fps = 100000 * num_frames / interv;
+		printf("SDL: %.2f fps\n", fps / 100.0f);
+		num_frames = 0;
+		start_tm = tm;
+		quit = 1;
+	}
+}