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D3D9: Apply a half-pixel offset in 2D shader draws. Makes Tantalus games less broken (but still broken)

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Henrik Rydgård 2022-08-30 15:01:04 +02:00
parent 81d741a5fe
commit e2480b9fa0
4 changed files with 13 additions and 4 deletions
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1
Common/GPU/D3D9/thin3d_d3d9.cpp
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@ -775,6 +775,7 @@ D3D9Context::D3D9Context(IDirect3D9 *d3d, IDirect3D9Ex *d3dEx, int adapterId, ID
caps_.framebufferSeparateDepthCopySupported = false;
caps_.texture3DSupported = true;
caps_.fragmentShaderDepthWriteSupported = true;
caps_.requiresHalfPixelOffset = true;
caps_.fragmentShaderStencilWriteSupported = false;
caps_.blendMinMaxSupported = true;
caps_.isTilingGPU = false;

1
Common/GPU/ShaderWriter.h
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@ -84,6 +84,7 @@ public:
void ConstFloat(const char *name, float value);
void SetFlags(ShaderWriterFlags flags) { flags_ |= flags; }
ShaderWriterFlags Flags() const { return flags_; }
void SetTexBindingBase(int base) { texBindingBase_ = base; }
ShaderWriter &SampleTexture2D(const char *texName, const char *uv);

1
Common/GPU/thin3d.h
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@ -608,6 +608,7 @@ struct DeviceCaps {
bool sampleRateShadingSupported;
bool setMaxFrameLatencySupported;
bool textureSwizzleSupported;
bool requiresHalfPixelOffset;
bool verySlowShaderCompiler;

14
GPU/Common/Draw2D.cpp
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@ -317,11 +317,17 @@ void Draw2D::Blit(Draw2DPipeline *pipeline, float srcX1, float srcY1, float srcX
float dY = 1.0f / (float)dstHeight;
float sX = 1.0f / (float)srcWidth;
float sY = 1.0f / (float)srcHeight;
float xOffset = 0.0f;
float yOffset = 0.0f;
if (draw_->GetDeviceCaps().requiresHalfPixelOffset) {
xOffset = -dX * 0.5f;
yOffset = -dY * 0.5f;
}
Draw2DVertex vtx[4] = {
{ -1.0f + 2.0f * dX * dstX1, -(1.0f - 2.0f * dY * dstY1), sX * srcX1, sY * srcY1 },
{ -1.0f + 2.0f * dX * dstX2, -(1.0f - 2.0f * dY * dstY1), sX * srcX2, sY * srcY1 },
{ -1.0f + 2.0f * dX * dstX1, -(1.0f - 2.0f * dY * dstY2), sX * srcX1, sY * srcY2 },
{ -1.0f + 2.0f * dX * dstX2, -(1.0f - 2.0f * dY * dstY2), sX * srcX2, sY * srcY2 },
{ -1.0f + 2.0f * dX * dstX1 + xOffset, -(1.0f - 2.0f * dY * dstY1) + yOffset, sX * srcX1, sY * srcY1 },
{ -1.0f + 2.0f * dX * dstX2 + xOffset, -(1.0f - 2.0f * dY * dstY1) + yOffset, sX * srcX2, sY * srcY1 },
{ -1.0f + 2.0f * dX * dstX1 + xOffset, -(1.0f - 2.0f * dY * dstY2) + yOffset, sX * srcX1, sY * srcY2 },
{ -1.0f + 2.0f * dX * dstX2 + xOffset, -(1.0f - 2.0f * dY * dstY2) + yOffset, sX * srcX2, sY * srcY2 },
};
DrawStrip2D(nullptr, vtx, 4, linear, pipeline, srcWidth, srcHeight, scaleFactor);