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[D3D12] tfetch: change epsilon sign, add 0.5 to getWeights coords

This commit is contained in:
Triang3l 2019-01-29 12:35:22 +03:00
parent 61fd5a6dc2
commit 0c8ce2af04
1 changed files with 20 additions and 15 deletions
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35
src/xenia/gpu/dxbc_shader_translator_fetch.cc
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@ -1373,23 +1373,26 @@ void DxbcShaderTranslator::ProcessTextureFetchInstruction(
// It's probably applicable to tfetchCube too, we're going to assume it's
// used for them the same way as for stacked textures.
// http://web.archive.org/web/20090511231340/http://msdn.microsoft.com:80/en-us/library/bb313959.aspx
// Adding 1/1024 - quarter of one fixed-point unit of subpixel precision
// (not to touch rounding when the GPU is converting to fixed-point) - to
// resolve the ambiguity when the texture coordinate is directly between two
// pixels, which hurts nearest-neighbor sampling (fixes the XBLA logo being
// blocky in Banjo-Kazooie and the outlines around things and overall
// blockiness in Halo 3).
float offset_x = instr.attributes.offset_x;
if (instr.opcode != FetchOpcode::kGetTextureWeights) {
offset_x += 1.0f / 1024.0f;
// Subtracting 1/1024 - quarter of one fixed-point unit of subpixel
// precision (not to touch rounding when the GPU is converting to
// fixed-point) - to resolve the ambiguity when the texture coordinate is
// directly between two pixels, which hurts nearest-neighbor sampling (fixes
// the XBLA logo being blocky in Banjo-Kazooie and the outlines around
// things and overall blockiness in Halo 3). The sign was checked in Halo 3,
// with plus there are outlines when MSAA is enabled, and also outline
// around the weapon when it's drawn over a shadow.
float offset_x = instr.attributes.offset_x - (1.0f / 1024.0f);
if (instr.opcode == FetchOpcode::kGetTextureWeights) {
// Needed for correct shadow filtering (at least in Halo 3).
offset_x += 0.5f;
}
float offset_y = 0.0f, offset_z = 0.0f;
if (instr.dimension == TextureDimension::k2D ||
instr.dimension == TextureDimension::k3D ||
instr.dimension == TextureDimension::kCube) {
offset_y = instr.attributes.offset_y;
if (instr.opcode != FetchOpcode::kGetTextureWeights) {
offset_y += 1.0f / 1024.0f;
offset_y = instr.attributes.offset_y - (1.0f / 1024.0f);
if (instr.opcode == FetchOpcode::kGetTextureWeights) {
offset_y += 0.5f;
}
// Don't care about the Z offset for cubemaps when getting weights because
// zero Z will be returned anyway (the face index doesn't participate in
@ -1398,10 +1401,12 @@ void DxbcShaderTranslator::ProcessTextureFetchInstruction(
(instr.dimension == TextureDimension::kCube &&
instr.opcode != FetchOpcode::kGetTextureWeights)) {
offset_z = instr.attributes.offset_z;
if (instr.opcode != FetchOpcode::kGetTextureWeights &&
instr.dimension == TextureDimension::k3D) {
if (instr.dimension == TextureDimension::k3D) {
// Z is the face index for cubemaps, so don't apply the epsilon to it.
offset_z += 1.0f / 1024.0f;
offset_z -= 1.0f / 1024.0f;
if (instr.opcode == FetchOpcode::kGetTextureWeights) {
offset_z += 0.5f;
}
}
}
}