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3D: keep the rasterizer from accidentally going out of bounds when given very flat X-major edge slopes.

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this, by a fucking shitshow of butterfly effect, ends up fixing #234. technically, the rasterizer was going out of bounds, which, under certain circumstances, caused interpolation to shit itself and generate Z values that were out of range (but still ended up in the zbuffer). sometimes those values ended up negative, which caused these glitches when polygons had to be drawn over those.

about fucking time.
This commit is contained in:
StapleButter
2018-11-04 23:21:58 +01:00
parent fb284f33ad
commit b4165cc0a9
7 changed files with 165 additions and 14 deletions
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19
src/ARM.h
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@ -93,11 +93,19 @@ public:
void TriggerIRQ();
void SetupCodeMem(u32 addr);
u16 CodeRead16(u32 addr)
{
Cycles += Waitstates[0][(addr>>24)&0xF];
if (CodeMem.Mem) return *(u16*)&CodeMem.Mem[addr & CodeMem.Mask];
u16 val;
// TODO eventually: on ARM9, THUMB opcodes are prefetched with 32bit reads
// probably not worth going through the trouble. we can probably just simulate
// the timing quirks resulting from this. or not.
if (!Num)
{
if (!CP15::HandleCodeRead16(addr, &val))
@ -106,12 +114,15 @@ public:
else
val = NDS::ARM7Read16(addr);
Cycles += Waitstates[0][(addr>>24)&0xF];
return val;
}
u32 CodeRead32(u32 addr)
{
Cycles += Waitstates[1][(addr>>24)&0xF];
if (CodeMem.Mem) return *(u32*)&CodeMem.Mem[addr & CodeMem.Mask];
u32 val;
if (!Num)
{
@ -121,7 +132,6 @@ public:
else
val = NDS::ARM7Read32(addr);
Cycles += Waitstates[1][(addr>>24)&0xF];
return val;
}
@ -220,6 +230,7 @@ public:
// waitstates:
// 0=code16 1=code32 2=data16 3=data32
// TODO eventually: nonsequential waitstates
// TODO NOT MAKE THIS A FUCKING GROSS HACK!!!!!!
s32 Waitstates[4][16];
s32 Cycles;
@ -238,9 +249,9 @@ public:
u32 ExceptionBase;
static u32 ConditionTable[16];
NDS::MemRegion CodeMem;
u32 debug;
static u32 ConditionTable[16];
};
namespace ARMInterpreter