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GPU/HW: Eliminate CPU round trip on oversized VRAM writes

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This commit is contained in:
Connor McLaughlin
2020-07-11 20:18:07 +10:00
parent e144392187
commit d1a2ebd8f3
6 changed files with 67 additions and 113 deletions
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17
src/core/gpu_hw_shadergen.cpp
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@ -1177,7 +1177,7 @@ std::string GPU_HW_ShaderGen::GenerateVRAMWriteFragmentShader(bool use_ssbo)
WriteCommonFunctions(ss);
DeclareUniformBuffer(
ss,
{"uint2 u_base_coords", "uint2 u_size", "uint u_buffer_base_offset", "uint u_mask_or_bits", "float u_depth_value"},
{"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)
@ -1203,13 +1203,16 @@ std::string GPU_HW_ShaderGen::GenerateVRAMWriteFragmentShader(bool use_ssbo)
DeclareFragmentEntryPoint(ss, 0, 1, {}, true, 1, true);
ss << R"(
{
uint2 coords = uint2(v_pos.xy) / uint2(RESOLUTION_SCALE, RESOLUTION_SCALE);
uint2 offset = coords - u_base_coords;
uint2 coords = uint2(uint(v_pos.x) / RESOLUTION_SCALE, fixYCoord(uint(v_pos.y)) / RESOLUTION_SCALE);
#if API_OPENGL || API_OPENGL_ES
// Lower-left origin flip for OpenGL
offset.y = u_size.y - offset.y - 1u;
#endif
// make sure it's not oversized and out of range
if (VECTOR_LT(coords, u_base_coords) && VECTOR_GE(coords, u_end_coords))
discard;
// 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);
uint buffer_offset = u_buffer_base_offset + (offset.y * u_size.x) + offset.x;
uint value = GET_VALUE(buffer_offset) | u_mask_or_bits;