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[PICA] Implement immediate mode triangle strip & fan

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wheremyfoodat 2023-04-11 20:06:18 +03:00
parent f1dfa437b9
commit eaa7b4d55b
1 changed files with 26 additions and 1 deletions
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27
src/core/PICA/regs.cpp
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@ -141,10 +141,35 @@ void GPU::writeInternalReg(u32 index, u32 value, u32 mask) {
immediateModeAttrIndex = 0;
immediateModeVertices[immediateModeVertIndex++] = v;
// Get primitive type
const u32 primConfig = regs[PICAInternalRegs::PrimitiveConfig];
const u32 primType = (primConfig >> 8) & 3;
// If we've reached 3 verts, issue a draw call
// Handle rendering depending on the primitive type
if (immediateModeVertIndex == 3) {
renderer.drawVertices(OpenGL::Triangle, &immediateModeVertices[0], 3);
immediateModeVertIndex = 0;
switch (primType) {
// Triangle or geometry primitive. Draw a triangle and discard all vertices
case 0: case 3:
immediateModeVertIndex = 0;
break;
// Triangle strip. Draw triangle, discard first vertex and keep the last 2
case 1:
immediateModeVertIndex = 2;
immediateModeVertices[0] = immediateModeVertices[1];
immediateModeVertices[1] = immediateModeVertices[2];
break;
// Triangle fan. Draw triangle, keep first vertex and last vertex, discard second vertex
case 2:
immediateModeVertIndex = 2;
immediateModeVertices[1] = immediateModeVertices[2];
break;
}
}
}
} else { // Writing to fixed attributes 13 and 14 probably does nothing, but we'll see