GL_EXT_float_blend support

DetermineFloatBlendSupport was added to be able to set floatBlend to true if requirements are met. Essentially GL_EXT_float_blend complements GL_EXT_color_buffer_float by making any non-blendable formats blendable. Bug: angleproject:4291 Change-Id: I40d6bb7a93b8847a63de2d25c6a8dc411d6d8fbb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2001479 Commit-Queue: Alexis Hétu <sugoi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>

GL_EXT_float_blend support
eb06bc24 · Alexis Hetu · Commit Bot · 41f6150e · eb06bc24
Commit eb06bc24 authored Jan 14, 2020 by Alexis Hetu Committed by Commit Bot Jan 17, 2020
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Caps.cpp src/libANGLE/Caps.cpp +13 -0

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--- a/src/libANGLE/Caps.cpp
+++ b/src/libANGLE/Caps.cpp
@@ -682,6 +682,18 @@ static bool DetermineColorBufferFloatSupport(const TextureCapsMap &textureCaps)
           GetFormatSupport(textureCaps, blendableFormats, true, false, true, true, true);
 }
+// Check for GL_EXT_float_blend support
+static bool DetermineFloatBlendSupport(const TextureCapsMap &textureCaps)
+{
+    constexpr GLenum requiredFormats[] = {
+        GL_R32F,
+        GL_RG32F,
+        GL_RGBA32F,
+    };
+    return GetFormatSupport(textureCaps, requiredFormats, true, false, true, true, true);
+}
 // Check for GL_EXT_texture_norm16 support
 static bool DetermineTextureNorm16Support(const TextureCapsMap &textureCaps)
 {
@@ -793,6 +805,7 @@ void Extensions::setTextureExtensionSupport(const TextureCapsMap &textureCaps)
    colorBufferFloatRGB              = DetermineColorBufferFloatRGBSupport(textureCaps);
    colorBufferFloatRGBA             = DetermineColorBufferFloatRGBASupport(textureCaps);
    colorBufferFloat                 = DetermineColorBufferFloatSupport(textureCaps);
+    floatBlend                       = DetermineFloatBlendSupport(textureCaps);
    textureNorm16                    = DetermineTextureNorm16Support(textureCaps);
    textureCompressionBPTC           = DetermineBPTCTextureSupport(textureCaps);
    compressedTexturePVRTC           = DeterminePVRTCTextureSupport(textureCaps);