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SoftGPU: Correct clipping for flat shading.

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It needs to use the provoking color, regardless of culling or clipping.

Fixes Blade Dancer lighting (see #4140.)
This commit is contained in:
Unknown W. Brackets 2018-11-22 17:48:55 -08:00
parent 1c19bce514
commit 11a8857a7e
3 changed files with 40 additions and 26 deletions
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34
GPU/Software/Clipper.cpp
View File

@ -176,10 +176,10 @@ void ProcessRect(const VertexData& v0, const VertexData& v1)
}
// Four triangles to do backfaces as well. Two of them will get backface culled.
ProcessTriangle(*topleft, *topright, *bottomright);
ProcessTriangle(*bottomright, *topright, *topleft);
ProcessTriangle(*bottomright, *bottomleft, *topleft);
ProcessTriangle(*topleft, *bottomleft, *bottomright);
ProcessTriangle(*topleft, *topright, *bottomright, buf[3]);
ProcessTriangle(*bottomright, *topright, *topleft, buf[3]);
ProcessTriangle(*bottomright, *bottomleft, *topleft, buf[3]);
ProcessTriangle(*topleft, *bottomleft, *bottomright, buf[3]);
} else {
// through mode handling
VertexData buf[4];
@ -271,10 +271,17 @@ void ProcessLine(VertexData& v0, VertexData& v1)
Rasterizer::DrawLine(data[0], data[1]);
}
void ProcessTriangle(VertexData& v0, VertexData& v1, VertexData& v2)
{
void ProcessTriangle(VertexData& v0, VertexData& v1, VertexData& v2, const VertexData &provoking) {
if (gstate.isModeThrough()) {
Rasterizer::DrawTriangle(v0, v1, v2);
// In case of cull reordering, make sure the right color is on the final vertex.
if (gstate.getShadeMode() == GE_SHADE_FLAT) {
VertexData corrected2 = v2;
corrected2.color0 = provoking.color0;
corrected2.color1 = provoking.color1;
Rasterizer::DrawTriangle(v0, v1, corrected2);
} else {
Rasterizer::DrawTriangle(v0, v1, v2);
}
return;
}
@ -339,14 +346,19 @@ void ProcessTriangle(VertexData& v0, VertexData& v1, VertexData& v2)
return;
}
for (int i = 0; i+3 <= numIndices; i+=3)
{
if(indices[i] != SKIP_FLAG)
{
for (int i = 0; i + 3 <= numIndices; i += 3) {
if (indices[i] != SKIP_FLAG) {
VertexData data[3] = { *Vertices[indices[i]], *Vertices[indices[i+1]], *Vertices[indices[i+2]] };
data[0].screenpos = TransformUnit::ClipToScreen(data[0].clippos);
data[1].screenpos = TransformUnit::ClipToScreen(data[1].clippos);
data[2].screenpos = TransformUnit::ClipToScreen(data[2].clippos);
if (gstate.getShadeMode() == GE_SHADE_FLAT) {
// So that the order of clipping doesn't matter...
data[2].color0 = provoking.color0;
data[2].color1 = provoking.color1;
}
Rasterizer::DrawTriangle(data[0], data[1], data[2]);
}
}

2
GPU/Software/Clipper.h
View File

@ -23,7 +23,7 @@ namespace Clipper {
void ProcessPoint(VertexData& v0);
void ProcessLine(VertexData& v0, VertexData& v1);
void ProcessTriangle(VertexData& v0, VertexData& v1, VertexData& v2);
void ProcessTriangle(VertexData& v0, VertexData& v1, VertexData& v2, const VertexData &provoking);
void ProcessRect(const VertexData& v0, const VertexData& v1);
}

30
GPU/Software/TransformUnit.cpp
View File

@ -342,12 +342,12 @@ void TransformUnit::SubmitPrimitive(void* vertices, void* indices, GEPrimitiveTy
case GE_PRIM_TRIANGLES:
{
if (!gstate.isCullEnabled() || gstate.isModeClear()) {
Clipper::ProcessTriangle(data[0], data[1], data[2]);
Clipper::ProcessTriangle(data[2], data[1], data[0]);
Clipper::ProcessTriangle(data[0], data[1], data[2], data[2]);
Clipper::ProcessTriangle(data[2], data[1], data[0], data[2]);
} else if (!gstate.getCullMode()) {
Clipper::ProcessTriangle(data[2], data[1], data[0]);
Clipper::ProcessTriangle(data[2], data[1], data[0], data[2]);
} else {
Clipper::ProcessTriangle(data[0], data[1], data[2]);
Clipper::ProcessTriangle(data[0], data[1], data[2], data[2]);
}
break;
}
@ -413,7 +413,8 @@ void TransformUnit::SubmitPrimitive(void* vertices, void* indices, GEPrimitiveTy
vreader.Goto(vtx);
}
data[(data_index++) % 3] = ReadVertex(vreader);
int provoking_index = (data_index++) % 3;
data[provoking_index] = ReadVertex(vreader);
if (outside_range_flag) {
// Drop all primitives containing the current vertex
skip_count = 2;
@ -427,14 +428,14 @@ void TransformUnit::SubmitPrimitive(void* vertices, void* indices, GEPrimitiveTy
}
if (!gstate.isCullEnabled() || gstate.isModeClear()) {
Clipper::ProcessTriangle(data[0], data[1], data[2]);
Clipper::ProcessTriangle(data[2], data[1], data[0]);
Clipper::ProcessTriangle(data[0], data[1], data[2], data[provoking_index]);
Clipper::ProcessTriangle(data[2], data[1], data[0], data[provoking_index]);
} else if ((!gstate.getCullMode()) ^ ((data_index - 1) % 2)) {
// We need to reverse the vertex order for each second primitive,
// but we additionally need to do that for every primitive if CCW cullmode is used.
Clipper::ProcessTriangle(data[2], data[1], data[0]);
Clipper::ProcessTriangle(data[2], data[1], data[0], data[provoking_index]);
} else {
Clipper::ProcessTriangle(data[0], data[1], data[2]);
Clipper::ProcessTriangle(data[0], data[1], data[2], data[provoking_index]);
}
}
break;
@ -466,7 +467,8 @@ void TransformUnit::SubmitPrimitive(void* vertices, void* indices, GEPrimitiveTy
vreader.Goto(vtx);
}
data[2 - ((data_index++) % 2)] = ReadVertex(vreader);
int provoking_index = 2 - ((data_index++) % 2);
data[provoking_index] = ReadVertex(vreader);
if (outside_range_flag) {
// Drop all primitives containing the current vertex
skip_count = 2;
@ -480,14 +482,14 @@ void TransformUnit::SubmitPrimitive(void* vertices, void* indices, GEPrimitiveTy
}
if (!gstate.isCullEnabled() || gstate.isModeClear()) {
Clipper::ProcessTriangle(data[0], data[1], data[2]);
Clipper::ProcessTriangle(data[2], data[1], data[0]);
Clipper::ProcessTriangle(data[0], data[1], data[2], data[provoking_index]);
Clipper::ProcessTriangle(data[2], data[1], data[0], data[provoking_index]);
} else if ((!gstate.getCullMode()) ^ ((data_index - 1) % 2)) {
// We need to reverse the vertex order for each second primitive,
// but we additionally need to do that for every primitive if CCW cullmode is used.
Clipper::ProcessTriangle(data[2], data[1], data[0]);
Clipper::ProcessTriangle(data[2], data[1], data[0], data[provoking_index]);
} else {
Clipper::ProcessTriangle(data[0], data[1], data[2]);
Clipper::ProcessTriangle(data[0], data[1], data[2], data[provoking_index]);
}
}
break;