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GPU/HW: Use texture loads for native resolution 

Hopefully work around sampling precision issues in older AMD drivers
and Mali Midgard if we're lucky. But I don't have anything this old
to verify with.
This commit is contained in:
Stenzek 2025-01-21 20:14:47 +10:00
parent 080eccd8fc
commit 19ca9cb47d
No known key found for this signature in database
3 changed files with 16 additions and 6 deletions
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16
src/core/gpu_hw_shadergen.cpp
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@ -883,7 +883,13 @@ float4 SampleFromVRAM(TEXPAGE_VALUE texpage, float2 coords)
#endif
// load colour/palette
float4 texel = SAMPLE_TEXTURE_LEVEL(samp0, float2(vicoord) * RCP_VRAM_SIZE, 0.0);
// use texelFetch()/load for native resolution to work around point sampling precision
// in some drivers, such as older AMD and Mali Midgard
#if !UPSCALED
float4 texel = LOAD_TEXTURE(samp0, int2(vicoord), 0);
#else
float4 texel = SAMPLE_TEXTURE_LEVEL(samp0, float2(vicoord) * RCP_VRAM_SIZE, 0.0);
#endif
uint vram_value = RGBA8ToRGBA5551(texel);
// apply palette
@ -898,13 +904,17 @@ float4 SampleFromVRAM(TEXPAGE_VALUE texpage, float2 coords)
uint2 palette_icoord = uint2(((texpage.z + palette_index) & 0x3FFu), texpage.w);
#endif
return SAMPLE_TEXTURE_LEVEL(samp0, float2(palette_icoord) * RCP_VRAM_SIZE, 0.0);
#if !UPSCALED
return LOAD_TEXTURE(samp0, int2(palette_icoord), 0);
#else
return SAMPLE_TEXTURE_LEVEL(samp0, float2(palette_icoord) * RCP_VRAM_SIZE, 0.0);
#endif
#else
// Direct texturing - usually render-to-texture effects.
#if !UPSCALED
uint2 icoord = ApplyTextureWindow(FloatToIntegerCoords(coords));
uint2 vicoord = (texpage.xy + icoord) & uint2(1023, 511);
return SAMPLE_TEXTURE_LEVEL(samp0, float2(vicoord) * RCP_VRAM_SIZE, 0.0);
return LOAD_TEXTURE(samp0, int2(vicoord), 0);
#else
// Coordinates are already upscaled, we need to downscale them to apply the texture
// window, then re-upscale/offset. We can't round here, because it could result in

2
src/core/gpu_thread.cpp
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@ -1,4 +1,4 @@
// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
// SPDX-FileCopyrightText: 2019-2025 Connor McLaughlin <stenzek@gmail.com>
// SPDX-License-Identifier: CC-BY-NC-ND-4.0
#include "gpu_thread.h"

4
src/core/shader_cache_version.h
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@ -1,8 +1,8 @@
// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
// SPDX-FileCopyrightText: 2019-2025 Connor McLaughlin <stenzek@gmail.com>
// SPDX-License-Identifier: CC-BY-NC-ND-4.0
#pragma once
#include "common/types.h"
static constexpr u32 SHADER_CACHE_VERSION = 27;
static constexpr u32 SHADER_CACHE_VERSION = 28;