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Allow 256-color rendering

This commit is contained in:
Jeffrey Pfau 2013-04-26 22:21:38 -07:00
parent 13c95a2aae
commit 1ff337c6fc
1 changed files with 45 additions and 25 deletions
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70
src/gba/renderers/video-software.c
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@ -16,7 +16,7 @@ static void GBAVideoSoftwareRendererUpdateDISPCNT(struct GBAVideoSoftwareRendere
static void GBAVideoSoftwareRendererWriteBGCNT(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* bg, uint16_t value);
static void GBAVideoSoftwareRendererWriteBLDCNT(struct GBAVideoSoftwareRenderer* renderer, uint16_t value);
static void _compositeBackground(struct GBAVideoSoftwareRenderer* renderer, int offset, int entry, struct PixelFlags flags);
static void _composite(struct GBAVideoSoftwareRenderer* renderer, int offset, uint16_t color, struct PixelFlags flags);
static void _drawBackgroundMode0(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* background, int y);
static void _drawTransformedSprite(struct GBAVideoSoftwareRenderer* renderer, struct GBATransformedObj* sprite, int y);
static void _drawSprite(struct GBAVideoSoftwareRenderer* renderer, struct GBAObj* sprite, int y);
@ -295,11 +295,11 @@ static void GBAVideoSoftwareRendererWriteBLDCNT(struct GBAVideoSoftwareRenderer*
}
}
static void _compositeBackground(struct GBAVideoSoftwareRenderer* renderer, int offset, int entry, struct PixelFlags flags) {
static void _composite(struct GBAVideoSoftwareRenderer* renderer, int offset, uint16_t color, struct PixelFlags flags) {
if (renderer->flags[offset].isSprite && flags.priority >= renderer->flags[offset].priority) {
if (renderer->flags[offset].target1) {
if (flags.target2) {
renderer->row[offset] = _mix(renderer->bldb, renderer->d.palette[entry], renderer->blda, renderer->row[offset]);
renderer->row[offset] = _mix(renderer->bldb, color, renderer->blda, renderer->row[offset]);
}
}
renderer->flags[offset].finalized = 1;
@ -307,22 +307,25 @@ static void _compositeBackground(struct GBAVideoSoftwareRenderer* renderer, int
return;
}
if (renderer->blendEffect == BLEND_NONE || (!flags.target1 && !flags.target2)) {
renderer->row[offset] = renderer->d.palette[entry];
renderer->row[offset] = color;
renderer->flags[offset].finalized = 1;
} else if (renderer->blendEffect == BLEND_BRIGHTEN || renderer->blendEffect == BLEND_DARKEN) {
renderer->row[offset] = renderer->variantPalette[entry];
} else if (renderer->blendEffect == BLEND_BRIGHTEN) {
renderer->row[offset] = _brighten(color, renderer->bldy);
renderer->flags[offset].finalized = 1;
} else if (renderer->blendEffect == BLEND_DARKEN) {
renderer->row[offset] = _darken(color, renderer->bldy);
renderer->flags[offset].finalized = 1;
} else if (renderer->blendEffect == BLEND_ALPHA) {
if (renderer->flags[offset].written) {
if (renderer->flags[offset].target1 && flags.target2) {
renderer->row[offset] = _mix(renderer->bldb, renderer->d.palette[entry], renderer->blda, renderer->row[offset]);
renderer->row[offset] = _mix(renderer->bldb, color, renderer->blda, renderer->row[offset]);
}
renderer->flags[offset].finalized = 1;
} else if (renderer->flags[offset].isSprite && renderer->flags[offset].target2 && flags.target1) {
renderer->row[offset] = _mix(renderer->blda, renderer->d.palette[entry], renderer->bldb, renderer->row[offset]);
renderer->row[offset] = _mix(renderer->blda, color, renderer->bldb, renderer->row[offset]);
renderer->flags[offset].finalized = 1;
} else {
renderer->row[offset] = renderer->d.palette[entry];
renderer->row[offset] = color;
renderer->flags[offset].target1 = flags.target1;
}
}
@ -350,6 +353,14 @@ static void _drawBackgroundMode0(struct GBAVideoSoftwareRenderer* renderer, stru
uint32_t screenBase;
uint32_t charBase;
uint16_t tileData;
struct PixelFlags flags = {
.target1 = background->target1,
.target2 = background->target2,
.priority = background->priority
};
unsigned int oldXBase = 1;
for (int outX = start; outX < end; ++outX) {
if (renderer->flags[outX].finalized) {
@ -360,28 +371,37 @@ static void _drawBackgroundMode0(struct GBAVideoSoftwareRenderer* renderer, stru
if (background->size & 1) {
xBase += (localX & 0x100) << 5;
}
screenBase = (background->screenBase >> 1) + (xBase >> 3) + (yBase << 2);
mapData.packed = renderer->d.vram[screenBase];
if (!mapData.vflip) {
localY = inY & 0x7;
} else {
localY = 7 - (inY & 0x7);
if (oldXBase != xBase) {
oldXBase = xBase;
screenBase = (background->screenBase >> 1) + (xBase >> 3) + (yBase << 2);
mapData.packed = renderer->d.vram[screenBase];
if (!mapData.vflip) {
localY = inY & 0x7;
} else {
localY = 7 - (inY & 0x7);
}
}
if (!mapData.hflip) {
localX = localX & 0x7;
} else {
localX = 7 - (localX & 0x7);
}
charBase = ((background->charBase + (mapData.tile << 5)) >> 1) + (localY << 1) + ((localX >> 2) & 1);
uint16_t tileData = renderer->d.vram[charBase];
tileData >>= (localX & 0x3) << 2;
if (tileData & 0xF) {
struct PixelFlags flags = {
.target1 = background->target1,
.target2 = background->target2,
.priority = background->priority
};
_compositeBackground(renderer, outX, (tileData & 0xF) | (mapData.palette << 4), flags);
if (!background->multipalette) {
charBase = ((background->charBase + (mapData.tile << 5)) >> 1) + (localY << 1) + ((localX >> 2) & 1);
tileData = renderer->d.vram[charBase];
tileData >>= (localX & 0x3) << 2;
uint16_t color = renderer->d.palette[(tileData & 0xF) | (mapData.palette << 4)];
if (tileData & 0xF) {
_composite(renderer, outX, color, flags);
}
} else {
charBase = ((background->charBase + (mapData.tile << 6)) >> 1) + (localY << 2) + ((localX >> 1) & 3);
tileData = renderer->d.vram[charBase];
tileData >>= (localX & 0x1) << 3;
uint16_t color = renderer->d.palette[tileData & 0xFF];
if (tileData & 0xFF) {
_composite(renderer, outX, color, flags);
}
}
}
}