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DS Video: Add display capture blending

This commit is contained in:
Vicki Pfau 2017-04-11 23:28:09 -07:00
parent 1fcddd6c0e
commit b88d0a560c
2 changed files with 88 additions and 19 deletions
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1
README.md
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@ -183,7 +183,6 @@ Missing features on DS are
- Vector matrix memory mapping
- Polygon/vertex RAM entry count memory mapping
- Rendered line count memory mapping
- Video output capture blending
- Horizontal scrolling on 3D background
- Some bitmap OBJ mappings
- DMA FIFO backgrounds

106
src/ds/video.c
View File

@ -223,6 +223,7 @@ static void _performCapture(struct DSVideo* video, int y) {
}
uint16_t* vram = &video->vram[0x10000 * block];
const color_t* pixelsA;
const uint16_t* srcB = NULL;
color_t pixels[DS_VIDEO_HORIZONTAL_PIXELS];
int width = DS_VIDEO_HORIZONTAL_PIXELS;
switch (DSRegisterDISPCAPCNTGetCaptureSize(dispcap)) {
@ -249,26 +250,95 @@ static void _performCapture(struct DSVideo* video, int y) {
pixelsA = pixels;
}
if (DSRegisterDISPCAPCNTGetCaptureSource(dispcap) > 0) {
DSRegisterDISPCNT dispcnt = video->p->ds9.memory.io[DS9_REG_A_DISPCNT_HI >> 1] << 16;
int block = DSRegisterDISPCNTGetVRAMBlock(dispcnt);
if (!video->p->memory.vramMode[block][4]) {
return;
}
srcB = &video->vram[0x10000 * block];
}
uint32_t base = DSRegisterDISPCAPCNTGetWriteOffset(dispcap) * 0x8000;
uint16_t pixel;
uint32_t readBase = DSRegisterDISPCAPCNTGetReadOffset(dispcap) * 0x8000;
unsigned weightA = DSRegisterDISPCAPCNTGetEVA(dispcap);
unsigned weightB = DSRegisterDISPCAPCNTGetEVB(dispcap);
if (weightA > 0x10) {
weightA = 0x10;
}
if (weightB > 0x10) {
weightB = 0x10;
}
uint32_t pixel;
int x;
// TODO: Blending
for (x = 0; x < width; ++x) {
color_t colorA = pixelsA[x];
#ifdef COLOR_16_BIT
#ifdef COLOR_5_6_5
pixel = colorA & 0x1F;
pixel |= (colorA & 0xFFC0) >> 1;
#else
pixel = colorA;
#endif
#else
pixel = (colorA >> 9) & 0x7C00;
pixel |= (colorA >> 6) & 0x03E0;
pixel |= (colorA >> 3) & 0x001F;
#endif
pixel |= 0x8000;
STORE_16(pixel, ((x + y * DS_VIDEO_HORIZONTAL_PIXELS) * 2 + base) & 0x1FFFE, vram);
switch (DSRegisterDISPCAPCNTGetCaptureSource(dispcap)) {
case 0:
for (x = 0; x < width; ++x) {
color_t colorA = pixelsA[x];
#ifdef COLOR_16_BIT
#ifdef COLOR_5_6_5
pixel = colorA & 0x1F;
pixel |= (colorA & 0xFFC0) >> 1;
#else
pixel = colorA;
#endif
#else
pixel = (colorA >> 9) & 0x7C00;
pixel |= (colorA >> 6) & 0x03E0;
pixel |= (colorA >> 3) & 0x001F;
#endif
pixel |= 0x8000;
STORE_16(pixel, ((x + y * DS_VIDEO_HORIZONTAL_PIXELS) * 2 + base) & 0x1FFFE, vram);
}
break;
case 1:
for (x = 0; x < width; ++x) {
LOAD_16(pixel, ((x + y * DS_VIDEO_HORIZONTAL_PIXELS) * 2 + readBase) & 0x1FFFE, srcB);
STORE_16(pixel, ((x + y * DS_VIDEO_HORIZONTAL_PIXELS) * 2 + base) & 0x1FFFE, vram);
}
break;
case 2:
case 3:
for (x = 0; x < width; ++x) {
color_t colorA = pixelsA[x];
uint16_t colorB;
LOAD_16(colorB, ((x + y * DS_VIDEO_HORIZONTAL_PIXELS) * 2 + readBase) & 0x1FFFE, srcB);
#ifdef COLOR_16_BIT
#ifdef COLOR_5_6_5
pixel = colorA & 0x1F;
pixel |= (colorA & 0xFFC0) >> 1;
#else
pixel = colorA;
#endif
#else
pixel = (colorA >> 9) & 0x7C00;
pixel |= (colorA >> 6) & 0x03E0;
pixel |= (colorA >> 3) & 0x001F;
#endif
uint32_t a = pixel & 0x7C1F;
uint32_t b = colorB & 0x7C1F;
a |= (pixel & 0x3E0) << 16;
b |= (colorB & 0x3E0) << 16;
pixel = ((a * weightA + b * weightB) / 16);
if (pixel & 0x04000000) {
pixel = (pixel & ~0x07E00000) | 0x03E00000;
}
if (pixel & 0x0020) {
pixel = (pixel & ~0x003F) | 0x001F;
}
if (pixel & 0x8000) {
pixel = (pixel & ~0xF800) | 0x7C00;
}
pixel = (pixel & 0x7C1F) | ((pixel >> 16) & 0x03E0);
pixel |= 0x8000;
STORE_16(pixel, ((x + y * DS_VIDEO_HORIZONTAL_PIXELS) * 2 + base) & 0x1FFFE, vram);
}
break;
}
}