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GPU/HW: Fix off-by-one in wrap-around VRAM writes

This commit is contained in:
Connor McLaughlin 2020-07-23 02:35:03 +10:00
parent 10cd00c8dd
commit 08a8434140
1 changed files with 8 additions and 8 deletions
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16
src/core/gpu_hw_shadergen.cpp
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@ -1175,10 +1175,10 @@ std::string GPU_HW_ShaderGen::GenerateVRAMWriteFragmentShader(bool use_ssbo)
std::stringstream ss;
WriteHeader(ss);
WriteCommonFunctions(ss);
DeclareUniformBuffer(
ss,
{"uint2 u_base_coords", "uint2 u_end_coords", "uint2 u_size", "uint u_buffer_base_offset", "uint u_mask_or_bits", "float u_depth_value"},
true);
DeclareUniformBuffer(ss,
{"uint2 u_base_coords", "uint2 u_end_coords", "uint2 u_size", "uint u_buffer_base_offset",
"uint u_mask_or_bits", "float u_depth_value"},
true);
if (use_ssbo && m_glsl)
{
@ -1211,8 +1211,8 @@ std::string GPU_HW_ShaderGen::GenerateVRAMWriteFragmentShader(bool use_ssbo)
// find offset from the start of the row/column
uint2 offset;
offset.x = (coords.x < u_base_coords.x) ? (((VRAM_SIZE.x / RESOLUTION_SCALE) - 1u) - u_base_coords.x + coords.x) : (coords.x - u_base_coords.x);
offset.y = (coords.y < u_base_coords.y) ? (((VRAM_SIZE.y / RESOLUTION_SCALE) - 1u) - u_base_coords.y + coords.y) : (coords.y - u_base_coords.y);
offset.x = (coords.x < u_base_coords.x) ? ((VRAM_SIZE.x / RESOLUTION_SCALE) - u_base_coords.x + coords.x) : (coords.x - u_base_coords.x);
offset.y = (coords.y < u_base_coords.y) ? ((VRAM_SIZE.y / RESOLUTION_SCALE) - u_base_coords.y + coords.y) : (coords.y - u_base_coords.y);
uint buffer_offset = u_buffer_base_offset + (offset.y * u_size.x) + offset.x;
uint value = GET_VALUE(buffer_offset) | u_mask_or_bits;
@ -1246,8 +1246,8 @@ std::string GPU_HW_ShaderGen::GenerateVRAMCopyFragmentShader()
// find offset from the start of the row/column
uint2 offset;
offset.x = (dst_coords.x < u_dst_coords.x) ? ((VRAM_SIZE.x - 1u) - u_dst_coords.x + dst_coords.x) : (dst_coords.x - u_dst_coords.x);
offset.y = (dst_coords.y < u_dst_coords.y) ? ((VRAM_SIZE.y - 1u) - u_dst_coords.y + dst_coords.y) : (dst_coords.y - u_dst_coords.y);
offset.x = (dst_coords.x < u_dst_coords.x) ? (VRAM_SIZE.x - u_dst_coords.x + dst_coords.x) : (dst_coords.x - u_dst_coords.x);
offset.y = (dst_coords.y < u_dst_coords.y) ? (VRAM_SIZE.y - u_dst_coords.y + dst_coords.y) : (dst_coords.y - u_dst_coords.y);
// find the source coordinates to copy from
uint2 src_coords = (u_src_coords + offset) % VRAM_SIZE;