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[Change] Stars use alpha instead of colors.

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This commit is contained in:
Allanis 2013-02-01 23:12:07 +00:00
parent fd22930673
commit c124c9fcca
1 changed files with 32 additions and 29 deletions
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59
src/space.c
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@ -12,34 +12,37 @@ static Vec2 starPos[STAR_LAYERS];
static gl_texture* starBG_create(const int density); static gl_texture* starBG_create(const int density);
static void put_pixel(SDL_Surface* surface, const int x, const int y, static void put_pixel(SDL_Surface* surface, const int x, const int y,
const Uint8 R, const Uint8 G, const Uint8 B); const Uint8 R, const Uint8 G, const Uint8 B, const Uint8 A);
// Modify the pixel at (x,y) of the surface to be of color RGB. // Modify the pixel at (x,y) of the surface to be of color RGB.
static void put_pixel(SDL_Surface* surface, const int x, const int y, const Uint8 R, const Uint8 G, const Uint8 B) { static void put_pixel(SDL_Surface* surface, const int x, const int y,
Uint32 color = SDL_MapRGB(surface->format, R, G, B); const Uint8 R, const Uint8 G, const Uint8 B, const Uint8 A) {
Uint8* bufp8; Uint32 pixel = SDL_MapRGBA(surface->format, R, G, B, A);
Uint16* bufp16; int bpp = surface->format->BytesPerPixel;
Uint32* bufp32; // p is the address to the pixel we want to set.
Uint8* p = (Uint8*)surface->pixels + y * surface->pitch + x * bpp;
switch(surface->format->BytesPerPixel) { switch(bpp) {
case 1: // 8bpp. case 1:
bufp8 = (Uint8)surface->pixels + y*surface->pitch + x; *p = pixel;
*bufp8 = color;
break; break;
case 2: // 15 or 16bpp. case 2:
bufp16 = (Uint16*)surface->pixels + y*surface->pitch/2 + x; *(Uint16*)p = pixel;
*bufp16 = color;
break; break;
case 3: // 24bpp, Slow as hell. case 3:
bufp8 = (Uint8*)surface->pixels + y*surface->pitch + x; if(SDL_BYTEORDER == SDL_BIG_ENDIAN) {
*(bufp8 + surface->format->Rshift/8) = R; p[0] = (pixel >> 16) & 0xff;
*(bufp8 + surface->format->Gshift/8) = G; p[1] = (pixel >> 8) & 0xff;
*(bufp8 + surface->format->Bshift/8) = B; p[2] = pixel & 0xff;
} else {
p[0] = pixel & 0xff;
p[1] = (pixel >> 8) & 0xff;
p[2] = (pixel >> 16) & 0xff;
}
break; break;
case 4: // 32bpp. case 4:
bufp32 = (Uint32*)surface->pixels + y*surface->pitch/4 + x; *(Uint32*)p = pixel;
*bufp32 = color;
break; break;
} }
} }
@ -49,7 +52,7 @@ static void put_pixel(SDL_Surface* surface, const int x, const int y, const Uint
static gl_texture* starBG_create(const int density) { static gl_texture* starBG_create(const int density) {
SDL_Surface* surface; SDL_Surface* surface;
int w, h; int w, h;
int i, b, d, x, y; int i, d;
w = (int)((float)gl_screen.w * 1.5); w = (int)((float)gl_screen.w * 1.5);
if((w & (w-1)) != 0) { if((w & (w-1)) != 0) {
@ -72,13 +75,13 @@ static gl_texture* starBG_create(const int density) {
return NULL; return NULL;
} }
SDL_LockSurface(surface);
d = (int)((FP)(density)*(FP)(gl_screen.w)*(FP)(gl_screen.h)/1000./1000.); d = (int)((FP)(density)*(FP)(gl_screen.w)*(FP)(gl_screen.h)/1000./1000.);
for(i = 0; i < d; i++) { for(i = 0; i < d; i++)
b = RNG(50, 255); put_pixel(surface, RNG(0,w-1), RNG(0,h-1), 255, 255, 255, RNG(50, 255));
x = RNG(0, w-1);
y = RNG(0, h-1); SDL_UnlockSurface(surface);
put_pixel(surface, x, y, b, b, b);
}
return gl_loadImage(surface); return gl_loadImage(surface);
} }