32 bpp floating point textures

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 8f2d4c129742fb9cbcb0be099b7538fbbec386d4..df244437b63a1071c959f689ca93a40fe3bb1950 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -444,6 +444,10 @@ void GrGLCaps::initConfigRenderableTable(const GrGLContextInfo& ctxInfo) {
         }
     }
 
+    if (this->isConfigTexturable(kRGBA_float_GrPixelConfig)) {
+      fConfigRenderSupport[kRGBA_float_GrPixelConfig][kNo_MSAA] = true;
+    }
+
     // If we don't support MSAA then undo any places above where we set a config as renderable with
     // msaa.
     if (kNone_MSFBOType == fMSFBOType) {
@@ -558,6 +562,13 @@ void GrGLCaps::initConfigTexturableTable(const GrGLContextInfo& ctxInfo, const G
     } else {
         fConfigTextureSupport[kR11_EAC_GrPixelConfig] = version >= GR_GL_VER(3, 0);
     }
+
+    // Check for floating point texture support
+    bool hasFPTexture = (kGL_GrGLStandard == standard);

[bsalomon, 2014/07/09 14:06:42]

It wasn't required in GL until 3.1 but is available before that via
GL_ARB_texture_float. We should prolly check that. We do sometimes run under old
GL versions.

+    if (!hasFPTexture) {
+      hasFPTexture = ctxInfo.hasExtension("GL_OES_texture_float");

[bsalomon, 2014/07/09 14:06:42]

RGBA32F is required as of ES3.1, we should check that here.

Also, if just this extension is available then only LINEAR filtering is allowed.
We'd have to make sure we never use another filtering mode. Maybe we should only
allow float textures if GL_OES_texture_float_linear is available? I'm not sure
how restrictive that is in terms of hardware.

+    }
+    fConfigTextureSupport[kRGBA_float_GrPixelConfig] = hasFPTexture;
 }
 
 bool GrGLCaps::readPixelsSupported(const GrGLInterface* intf,