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gl_rasterizer: Fix buffers without size

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On NVN buffers can be enabled but have no size. According to deko3d and
the behavior we see in Animal Crossing: New Horizons these buffers get
the special address of 0x1000 and limit themselves to 0xfff.

Implement buffers without a size by binding a null buffer to OpenGL
without a side.

1d1930beea/source/maxwell/gpu_3d_vbo.cpp (L62-L63)
This commit is contained in:
ReinUsesLisp 2020-04-19 01:25:52 -03:00
parent f293b15611
commit 0bbae63300
3 changed files with 13 additions and 8 deletions
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12
src/video_core/renderer_opengl/gl_rasterizer.cpp
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@ -185,8 +185,12 @@ void RasterizerOpenGL::SetupVertexBuffer() {
const GPUVAddr start = vertex_array.StartAddress();
const GPUVAddr end = regs.vertex_array_limit[index].LimitAddress();
ASSERT(end > start);
const u64 size = end - start + 1;
ASSERT(end >= start);
const u64 size = end - start;
if (size == 0) {
glBindVertexBuffer(static_cast<GLuint>(index), 0, 0, vertex_array.stride);
continue;
}
const auto [vertex_buffer, vertex_buffer_offset] = buffer_cache.UploadMemory(start, size);
glBindVertexBuffer(static_cast<GLuint>(index), vertex_buffer, vertex_buffer_offset,
vertex_array.stride);
@ -310,8 +314,8 @@ std::size_t RasterizerOpenGL::CalculateVertexArraysSize() const {
const GPUVAddr start = regs.vertex_array[index].StartAddress();
const GPUVAddr end = regs.vertex_array_limit[index].LimitAddress();
ASSERT(end > start);
size += end - start + 1;
size += end - start;
ASSERT(end >= start);
}
return size;