Fix the shader calculation for the level of detail for certain samplers.

We were using an extra sqrt function for some cases. TRAC #23591 Change-Id: I7d5d2b4b78586085396a281daf7975be316a1386 Signed-off-by: Shannon Woods Signed-off-by: Geoff Lang

Fix the shader calculation for the level of detail for certain samplers.
03847b6d · Jamie Madill · 829f59e9 · 03847b6d
Commit 03847b6d authored Nov 13, 2013 by Jamie Madill
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OutputHLSL.cpp src/compiler/translator/OutputHLSL.cpp +3 -3

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--- a/src/compiler/translator/OutputHLSL.cpp
+++ b/src/compiler/translator/OutputHLSL.cpp
@@ -1091,7 +1091,7 @@ void OutputHLSL::header()
                                       "    float2 tSized = float2(t.x * width, t.y * height);\n"
                                       "    float dx = length(ddx(tSized));\n"
                                       "    float dy = length(ddy(tSized));\n"
-                                       "    float lod = log2(max(sqrt(dx), sqrt(dy)));\n";
+                                       "    float lod = log2(max(dx, dy));\n";
                                if (textureFunction->method == TextureFunction::BIAS)
                                {
@@ -1121,7 +1121,7 @@ void OutputHLSL::header()
                                       "    float2 tSized = float2(t.x * width, t.y * height);\n"
                                       "    float dx = length(ddx(tSized));\n"
                                       "    float dy = length(ddy(tSized));\n"
-                                       "    float lod = log2(max(sqrt(dx), sqrt(dy)));\n";
+                                       "    float lod = log2(max(dx, dy));\n";
                                if (textureFunction->method == TextureFunction::BIAS)
                                {
@@ -1152,7 +1152,7 @@ void OutputHLSL::header()
                                   "    float3 tSized = float3(t.x * width, t.y * height, t.z * depth);\n"
                                   "    float dx = length(ddx(tSized));\n"
                                   "    float dy = length(ddy(tSized));\n"
-                                   "    float lod = log2(max(sqrt(dx), sqrt(dy)));\n";
+                                   "    float lod = log2(max(dx, dy));\n";
                            if (textureFunction->method == TextureFunction::BIAS)
                            {