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Atari ST: Launcher graphics render

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UnknownShadow200 2025-08-24 07:08:07 +10:00
parent aabc23348b
commit 28ef8faaa1
1 changed files with 10 additions and 9 deletions
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19
src/atari_st/Window_Atari.c
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@ -109,17 +109,16 @@ void Window_AllocFramebuffer(struct Bitmap* bmp, int width, int height) {
bmp->height = height; bmp->height = height;
} }
// Each group of 16 pixels is interleaved across 4 bitplanes
struct GRWORD { UWORD plane1, plane2, plane3, plane4; };
// TODO should be done in assembly.. search up 'chunky to planar atari ST' // TODO should be done in assembly.. search up 'chunky to planar atari ST'
void Window_DrawFramebuffer(Rect2D r, struct Bitmap* bmp) { void Window_DrawFramebuffer(Rect2D r, struct Bitmap* bmp) {
// TODO // TODO
UWORD* ptr = Physbase(); UWORD* ptr = Physbase();
Mem_Set(ptr, 0, 32000); Mem_Set(ptr, 0, 32000);
int idx = 0; int idx = 0;
struct GRWORD* planes = (struct GRWORD*)ptr;
UWORD* plane1 = ptr + 0;
UWORD* plane2 = ptr + 4000;
UWORD* plane3 = ptr + 8000;
UWORD* plane4 = ptr + 12000;
for (int y = 0; y < r.height; y++) for (int y = 0; y < r.height; y++)
{ {
@ -136,10 +135,12 @@ void Window_DrawFramebuffer(Rect2D r, struct Bitmap* bmp) {
//int pal = R | (G << 1) | (B << 2); //int pal = R | (G << 1) | (B << 2);
int b1 = B & 0x01, b2 = (B >> 1); int b1 = B & 0x01, b2 = (B >> 1);
plane1[idx >> 4] |= R << (idx & 0x0F); int word = idx >> 4, bit = 15 - (idx & 0x0F);
plane2[idx >> 4] |= G << (idx & 0x0F);
plane3[idx >> 4] |= b1<< (idx & 0x0F); planes[word].plane1 |= R << bit;
plane4[idx >> 4] |= b2<< (idx & 0x0F); planes[word].plane2 |= G << bit;
planes[word].plane3 |= b1<< bit;
planes[word].plane4 |= b2<< bit;
} }
} }
} }