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metal: fix quad drawing on older iOS devices

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This commit is contained in:
Alex Szpakowski
2021-12-24 19:13:48 -04:00
parent a431e70179
commit 620dc42292
1 changed files with 66 additions and 18 deletions
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src/modules/graphics/metal/Graphics.mm
+66 -18
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@@ -1076,6 +1076,29 @@ void Graphics::draw(const DrawIndexedCommand &cmd)
++drawCalls;
}}
static inline void advanceVertexOffsets(const VertexAttributes &attributes, BufferBindings &buffers, int vertexcount)
{
// TODO: Figure out a better way to avoid touching the same buffer multiple
// times, if multiple attributes share the buffer.
uint32 touchedbuffers = 0;
for (unsigned int i = 0; i < VertexAttributes::MAX; i++)
{
if (!attributes.isEnabled(i))
continue;
auto &attrib = attributes.attribs[i];
uint32 bufferbit = 1u << attrib.bufferIndex;
if ((touchedbuffers & bufferbit) == 0)
{
touchedbuffers |= bufferbit;
const auto &layout = attributes.bufferLayouts[attrib.bufferIndex];
buffers.info[attrib.bufferIndex].offset += layout.stride * vertexcount;
}
}
}
void Graphics::drawQuads(int start, int count, const VertexAttributes &attributes, const BufferBindings &buffers, love::graphics::Texture *texture)
{ @autoreleasepool {
const int MAX_VERTICES_PER_DRAW = LOVE_UINT16_MAX;
@@ -1092,30 +1115,55 @@ void Graphics::drawQuads(int start, int count, const VertexAttributes &attribute
applyRenderState(encoder, attributes);
applyShaderUniforms(encoder, Shader::current, texture);
setVertexBuffers(encoder, &buffers, renderBindings);
id<MTLBuffer> ib = getMTLBuffer(quadIndexBuffer);
// TODO: support for iOS devices that don't support base vertex.
int basevertex = start * 4;
for (int quadindex = 0; quadindex < count; quadindex += MAX_QUADS_PER_DRAW)
// Some older iOS devices don't support base vertex rendering.
if (families.apple[3] || families.mac[1] || families.macCatalyst[1])
{
int quadcount = std::min(MAX_QUADS_PER_DRAW, count - quadindex);
setVertexBuffers(encoder, &buffers, renderBindings);
[encoder drawIndexedPrimitives:MTLPrimitiveTypeTriangle
indexCount:quadcount * 6
indexType:MTLIndexTypeUInt16
indexBuffer:ib
indexBufferOffset:0
instanceCount:1
baseVertex:basevertex
baseInstance:0];
int basevertex = start * 4;
++drawCalls;
for (int quadindex = 0; quadindex < count; quadindex += MAX_QUADS_PER_DRAW)
{
int quadcount = std::min(MAX_QUADS_PER_DRAW, count - quadindex);
basevertex += quadcount * 4;
[encoder drawIndexedPrimitives:MTLPrimitiveTypeTriangle
indexCount:quadcount * 6
indexType:MTLIndexTypeUInt16
indexBuffer:ib
indexBufferOffset:0
instanceCount:1
baseVertex:basevertex
baseInstance:0];
++drawCalls;
basevertex += quadcount * 4;
}
}
else
{
BufferBindings bufferscopy = buffers;
if (start > 0)
advanceVertexOffsets(attributes, bufferscopy, start * 4);
for (int quadindex = 0; quadindex < count; quadindex += MAX_QUADS_PER_DRAW)
{
setVertexBuffers(encoder, &bufferscopy, renderBindings);
int quadcount = std::min(MAX_QUADS_PER_DRAW, count - quadindex);
[encoder drawIndexedPrimitives:MTLPrimitiveTypeTriangle
indexCount:quadcount * 6
indexType:MTLIndexTypeUInt16
indexBuffer:ib
indexBufferOffset:0];
++drawCalls;
if (count > MAX_QUADS_PER_DRAW)
advanceVertexOffsets(attributes, bufferscopy, quadcount * 4);
}
}
}}