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swiftshader
Commit 9b4b63bf by Alexis Hetu Committed by Alexis Hétu
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Increase precision of 8 bit textures

Only use the upper 8 bits of the 16 bit fields when reading and outputting 8 bit values in order to get exact representations of x/255 for each possible 8 bit value. Bug: swiftshader:122 Bug: b/129523279 Change-Id: I0cd54eb325c24f2fc5a53f12a0b90696024ca9d1 Tests: dEQP-VK.memory.pipeline_barrier.all.* Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33028Tested-by: 's avatarAlexis Hétu <sugoi@google.com> Reviewed-by: 's avatarChris Forbes <chrisforbes@google.com> Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
parent 67180a07
Showing with 31 additions and 21 deletions
src/Pipeline/SamplerCore.cpp
......@@ -178,6 +178,17 @@ namespace sw
c.z *= Float4(1.0f / 0x7F00);
c.w *= Float4(1.0f / 0x7F00);
break;
case VK_FORMAT_R8_UNORM:
case VK_FORMAT_R8G8_UNORM:
case VK_FORMAT_R8G8B8A8_UNORM:
case VK_FORMAT_A8B8G8R8_UNORM_PACK32:
case VK_FORMAT_B8G8R8A8_SRGB:
case VK_FORMAT_R8G8B8A8_SRGB:
c.x *= Float4(1.0f / 0xFF00u);
c.y *= Float4(1.0f / 0xFF00u);
c.z *= Float4(1.0f / 0xFF00u);
c.w *= Float4(1.0f / 0xFF00u);
break;
default:
for (int component = 0; component < textureComponentCount(); component++)
{
......@@ -218,6 +229,17 @@ namespace sw
c.z = Float4(cs.z) * Float4(1.0f / 0x7F00);
c.w = Float4(cs.w) * Float4(1.0f / 0x7F00);
break;
case VK_FORMAT_R8_UNORM:
case VK_FORMAT_R8G8_UNORM:
case VK_FORMAT_R8G8B8A8_UNORM:
case VK_FORMAT_A8B8G8R8_UNORM_PACK32:
case VK_FORMAT_B8G8R8A8_SRGB:
case VK_FORMAT_R8G8B8A8_SRGB:
c.x = Float4(As<UShort4>(cs.x)) * Float4(1.0f / 0xFF00u);
c.y = Float4(As<UShort4>(cs.y)) * Float4(1.0f / 0xFF00u);
c.z = Float4(As<UShort4>(cs.z)) * Float4(1.0f / 0xFF00u);
c.w = Float4(As<UShort4>(cs.w)) * Float4(1.0f / 0xFF00u);
break;
default:
for(int component = 0; component < textureComponentCount(); component++)
{
......@@ -1379,10 +1401,10 @@ namespace sw
c.x = As<Short4>(UnpackHigh(c.x, c.y));
c.y = c.z;
c.w = c.x;
c.z = UnpackLow(As<Byte8>(c.z), As<Byte8>(c.z));
c.y = UnpackHigh(As<Byte8>(c.y), As<Byte8>(c.y));
c.x = UnpackLow(As<Byte8>(c.x), As<Byte8>(c.x));
c.w = UnpackHigh(As<Byte8>(c.w), As<Byte8>(c.w));
c.z = UnpackLow(As<Byte8>(Short4(0)), As<Byte8>(c.z));
c.y = UnpackHigh(As<Byte8>(Short4(0)), As<Byte8>(c.y));
c.x = UnpackLow(As<Byte8>(Short4(0)), As<Byte8>(c.x));
c.w = UnpackHigh(As<Byte8>(Short4(0)), As<Byte8>(c.w));
break;
case VK_FORMAT_R8G8B8A8_UNORM:
case VK_FORMAT_R8G8B8A8_SINT:
......@@ -1392,10 +1414,10 @@ namespace sw
c.x = As<Short4>(UnpackLow(c.x, c.y));
c.y = c.x;
c.w = c.z;
c.x = UnpackLow(As<Byte8>(c.x), As<Byte8>(c.x));
c.y = UnpackHigh(As<Byte8>(c.y), As<Byte8>(c.y));
c.z = UnpackLow(As<Byte8>(c.z), As<Byte8>(c.z));
c.w = UnpackHigh(As<Byte8>(c.w), As<Byte8>(c.w));
c.x = UnpackLow(As<Byte8>(Short4(0)), As<Byte8>(c.x));
c.y = UnpackHigh(As<Byte8>(Short4(0)), As<Byte8>(c.y));
c.z = UnpackLow(As<Byte8>(Short4(0)), As<Byte8>(c.z));
c.w = UnpackHigh(As<Byte8>(Short4(0)), As<Byte8>(c.w));
// Propagate sign bit
if(state.textureFormat == VK_FORMAT_R8G8B8A8_SINT)
{
......@@ -1404,16 +1426,6 @@ namespace sw
c.z >>= 8;
c.w >>= 8;
}
if (state.textureFormat == VK_FORMAT_R8G8B8A8_SNORM)
{
// TODO: avoid populating the low bits at all.
c.x &= Short4(0xFF00u);
c.y &= Short4(0xFF00u);
c.z &= Short4(0xFF00u);
c.w &= Short4(0xFF00u);
}
break;
case VK_FORMAT_R8G8B8A8_UINT:
c.z = As<Short4>(UnpackHigh(c.x, c.y));
......@@ -1439,9 +1451,6 @@ namespace sw
switch(state.textureFormat)
{
case VK_FORMAT_R8G8_UNORM:
c.y = (c.x & Short4(0xFF00u)) | As<Short4>(As<UShort4>(c.x) >> 8);
c.x = (c.x & Short4(0x00FFu)) | (c.x << 8);
break;
case VK_FORMAT_R8G8_SNORM:
c.y = (c.x & Short4(0xFF00u));
c.x = (c.x << 8);
......@@ -1481,6 +1490,7 @@ namespace sw
}
break;
case VK_FORMAT_R8_SNORM:
case VK_FORMAT_R8_UNORM:
// TODO: avoid populating the low bits at all.
c.x = Unpack(As<Byte4>(c0));
c.x &= Short4(0xFF00u);
......
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