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GBA Video: Fix out of bounds sprite transforms

This commit is contained in:
Jeffrey Pfau 2016-12-11 17:55:41 -08:00
parent 4085b9cdc5
commit 3415484d9d
2 changed files with 19 additions and 13 deletions
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1
CHANGES
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@ -34,6 +34,7 @@ Bugfixes:
- GBA: Add savegame override for Crash Bandicoot 2
- ARM7: PSR mode bits should not get sign extended
- GBA: Only unhalt CPU if an IRQ actually fires
- GBA Video: Fix out of bounds sprite transforms
Misc:
- SDL: Remove scancode key input
- GBA Video: Clean up unused timers

31
src/gba/renderers/software-obj.c
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@ -52,8 +52,8 @@
renderer->spriteCyclesRemaining -= 2; \
xAccum += mat.a; \
yAccum += mat.c; \
int localX = (xAccum >> 8) + (width >> 1); \
int localY = (yAccum >> 8) + (height >> 1); \
int localX = xAccum >> 8; \
int localY = yAccum >> 8; \
\
if (localX & widthMask || localY & heightMask) { \
break; \
@ -200,24 +200,25 @@ int GBAVideoSoftwareRendererPreprocessSprite(struct GBAVideoSoftwareRenderer* re
int outX = x >= start ? x : start;
int condition = x + totalWidth;
int inX = outX - x;
int xAccum = mat.a * (inX - 1 - (totalWidth >> 1)) + mat.b * (inY - (totalHeight >> 1));
int yAccum = mat.c * (inX - 1 - (totalWidth >> 1)) + mat.d * (inY - (totalHeight >> 1));
if (end < condition) {
condition = end;
}
int xAccum = mat.a * (inX - 1 - (totalWidth >> 1)) + mat.b * (inY - (totalHeight >> 1)) + (width << 7);
int yAccum = mat.c * (inX - 1 - (totalWidth >> 1)) + mat.d * (inY - (totalHeight >> 1)) + (height << 7);
// Clip off early pixels
// TODO: Transform end coordinates too
if (mat.a) {
if ((xAccum >> 8) < -(width >> 1)) {
int32_t diffX = -(width << 7) - xAccum - 1;
if ((xAccum >> 8) < 0) {
int32_t diffX = -xAccum - 1;
int32_t x = mat.a ? diffX / mat.a : 0;
xAccum += mat.a * x;
yAccum += mat.c * x;
outX += x;
inX += x;
} else if ((xAccum >> 8) >= (width >> 1)) {
int32_t diffX = (width << 7) - xAccum;
} else if ((xAccum >> 8) >= width) {
int32_t diffX = (width << 8) - xAccum;
int32_t x = mat.a ? diffX / mat.a : 0;
xAccum += mat.a * x;
yAccum += mat.c * x;
@ -226,15 +227,15 @@ int GBAVideoSoftwareRendererPreprocessSprite(struct GBAVideoSoftwareRenderer* re
}
}
if (mat.c) {
if ((yAccum >> 8) < -(height >> 1)) {
int32_t diffY = -(height << 7) - yAccum - 1;
if ((yAccum >> 8) < 0) {
int32_t diffY = - yAccum - 1;
int32_t y = mat.c ? diffY / mat.c : 0;
xAccum += mat.a * y;
yAccum += mat.c * y;
outX += y;
inX += y;
} else if ((yAccum >> 8) >= (height >> 1)) {
int32_t diffY = (height << 7) - yAccum;
} else if ((yAccum >> 8) >= height) {
int32_t diffY = (height << 8) - yAccum;
int32_t y = mat.c ? diffY / mat.c : 0;
xAccum += mat.a * y;
yAccum += mat.c * y;
@ -243,6 +244,10 @@ int GBAVideoSoftwareRendererPreprocessSprite(struct GBAVideoSoftwareRenderer* re
}
}
if (outX < start || outX >= condition) {
return 0;
}
if (!GBAObjAttributesAIs256Color(sprite->a)) {
palette = &palette[GBAObjAttributesCGetPalette(sprite->c) << 4];
if (flags & FLAG_OBJWIN) {