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metal: hook up emulated 'fan' mesh draw mode.

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This commit is contained in:
Alex Szpakowski
2022-01-22 12:59:09 -04:00
parent 3ecae61189
commit 62de8f62c7
6 changed files with 83 additions and 30 deletions
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src/modules/graphics/Mesh.cpp
+36 -23
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@@ -501,22 +501,21 @@ void Mesh::setDrawRange(int start, int count)
if (start < 0 || count <= 0)
throw love::Exception("Invalid draw range.");
rangeStart = start;
rangeCount = count;
drawRange = Range(start, count);
}
void Mesh::setDrawRange()
{
rangeStart = rangeCount = -1;
drawRange.invalidate();
}
bool Mesh::getDrawRange(int &start, int &count) const
{
if (rangeStart < 0 || rangeCount <= 0)
if (!drawRange.isValid())
return false;
start = rangeStart;
count = rangeCount;
start = (int) drawRange.getOffset();
count = (int) drawRange.getSize();
return true;
}
@@ -595,9 +594,30 @@ void Mesh::drawInstanced(Graphics *gfx, const Matrix4 &m, int instancecount)
Graphics::TempTransform transform(gfx, m);
if (useIndexBuffer && indexBuffer != nullptr && indexCount > 0)
Buffer *indexbuffer = useIndexBuffer ? indexBuffer : nullptr;
int indexcount = (int) indexCount;
Range range = drawRange;
// Emulated triangle fan via an index buffer.
if (primitiveType == PRIMITIVE_TRIANGLE_FAN && indexbuffer == nullptr && gfx->getFanIndexBuffer())
{
Graphics::DrawIndexedCommand cmd(&attributes, &buffers, indexBuffer);
indexbuffer = gfx->getFanIndexBuffer();
indexcount = graphics::getIndexCount(TRIANGLEINDEX_FAN, vertexCount);
if (range.isValid())
{
int start = graphics::getIndexCount(TRIANGLEINDEX_FAN, (int) range.getOffset());
int count = graphics::getIndexCount(TRIANGLEINDEX_FAN, (int) range.getSize());
range = Range(start, count);
}
}
if (indexbuffer != nullptr && indexcount > 0)
{
Range r(0, indexcount);
if (range.isValid())
r.intersect(range);
Graphics::DrawIndexedCommand cmd(&attributes, &buffers, indexbuffer);
cmd.primitiveType = primitiveType;
cmd.indexType = indexDataType;
@@ -605,30 +625,23 @@ void Mesh::drawInstanced(Graphics *gfx, const Matrix4 &m, int instancecount)
cmd.texture = texture;
cmd.cullMode = gfx->getMeshCullMode();
int start = std::min(std::max(0, rangeStart), (int) indexCount - 1);
cmd.indexBufferOffset = start * getIndexDataSize(indexDataType);
cmd.indexCount = (int) indexCount;
if (rangeCount > 0)
cmd.indexCount = std::min(cmd.indexCount, rangeCount);
cmd.indexCount = std::min(cmd.indexCount, (int) indexCount - start);
cmd.indexBufferOffset = r.getOffset() * indexbuffer->getArrayStride();
cmd.indexCount = (int) r.getSize();
if (cmd.indexCount > 0)
gfx->draw(cmd);
}
else if (vertexCount > 0)
{
Range r(0, vertexCount);
if (range.isValid())
r.intersect(range);
Graphics::DrawCommand cmd(&attributes, &buffers);
cmd.primitiveType = primitiveType;
cmd.vertexStart = std::min(std::max(0, rangeStart), (int) vertexCount - 1);
cmd.vertexCount = (int) vertexCount;
if (rangeCount > 0)
cmd.vertexCount = std::min(cmd.vertexCount, rangeCount);
cmd.vertexCount = std::min(cmd.vertexCount, (int) vertexCount - cmd.vertexStart);
cmd.vertexStart = (int) r.getOffset();
cmd.vertexCount = (int) r.getSize();
cmd.instanceCount = instancecount;
cmd.texture = texture;
cmd.cullMode = gfx->getMeshCullMode();