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VideoBackends: Scale bounding box rectangle in the pixel shader

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This commit is contained in:
Stenzek
2019-03-20 22:14:38 +10:00
parent 20999db93c
commit 16294acd2a
5 changed files with 59 additions and 145 deletions
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68
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -444,16 +444,46 @@ void WritePixelShaderCommonHeader(ShaderCode& out, APIType ApiType, u32 num_texg
if (bounding_box)
{
if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
{
out.Write("SSBO_BINDING(0) buffer BBox {\n"
"\tint bbox_left, bbox_right, bbox_top, bbox_bottom;\n"
"};\n");
}
else
{
out.Write("globallycoherent RWBuffer<int> bbox_data : register(u2);\n");
}
out.Write(R"(
#ifdef API_D3D
globallycoherent RWBuffer<int> bbox_data : register(u2);
#define atomicMin InterlockedMin
#define atomicMax InterlockedMax
#define bbox_left bbox_data[0]
#define bbox_right bbox_data[1]
#define bbox_top bbox_data[2]
#define bbox_bottom bbox_data[3]
#else
SSBO_BINDING(0) buffer BBox {
int bbox_left, bbox_right, bbox_top, bbox_bottom;
};
#endif
void UpdateBoundingBox(float2 rawpos) {
// The pixel center in the GameCube GPU is 7/12, not 0.5 (see VertexShaderGen.cpp)
// Adjust for this by unapplying the offset we added in the vertex shader.
const float PIXEL_CENTER_OFFSET = 7.0 / 12.0 - 0.5;
float2 offset = float2(PIXEL_CENTER_OFFSET, -PIXEL_CENTER_OFFSET);
#ifdef API_OPENGL
// OpenGL lower-left origin means that Y goes in the opposite direction.
offset.y = -offset.y;
#endif
// The bounding box register is exclusive of the right coordinate, hence the +1.
int2 pos = iround(rawpos * cefbscale + offset);
int2 pos_offset = pos + int2(1, 1);
if (bbox_left > pos.x)
atomicMin(bbox_left, pos.x);
if (bbox_right < pos_offset.x)
atomicMax(bbox_right, pos_offset.x);
if (bbox_top > pos.y)
atomicMin(bbox_top, pos.y);
if (bbox_bottom < pos_offset.y)
atomicMax(bbox_bottom, pos_offset.y);
}
)");
}
}
@ -859,23 +889,7 @@ ShaderCode GeneratePixelShaderCode(APIType ApiType, const ShaderHostConfig& host
WriteBlend(out, uid_data);
if (uid_data->bounding_box)
{
if (ApiType == APIType::D3D)
{
out.Write(
"\tif(bbox_data[0] > int(rawpos.x)) InterlockedMin(bbox_data[0], int(rawpos.x));\n"
"\tif(bbox_data[1] < int(rawpos.x)) InterlockedMax(bbox_data[1], int(rawpos.x));\n"
"\tif(bbox_data[2] > int(rawpos.y)) InterlockedMin(bbox_data[2], int(rawpos.y));\n"
"\tif(bbox_data[3] < int(rawpos.y)) InterlockedMax(bbox_data[3], int(rawpos.y));\n");
}
else
{
out.Write("\tif(bbox_left > int(rawpos.x)) atomicMin(bbox_left, int(rawpos.x));\n"
"\tif(bbox_right < int(rawpos.x)) atomicMax(bbox_right, int(rawpos.x));\n"
"\tif(bbox_top > int(rawpos.y)) atomicMin(bbox_top, int(rawpos.y));\n"
"\tif(bbox_bottom < int(rawpos.y)) atomicMax(bbox_bottom, int(rawpos.y));\n");
}
}
out.Write("\tUpdateBoundingBox(rawpos.xy);\n");
out.Write("}\n");