From 3f801cbb67895fa9fa29498aa017a7666960a627 Mon Sep 17 00:00:00 2001
From: jvanverth <jvanverth@google.com>
Date: Tue, 16 Dec 2014 09:49:38 -0800
Subject: Change desktop and ES 3.0 to always use sized internal texture
 formats.

Committed: https://skia.googlesource.com/skia/+/bc02bf0ee4221604796cd6d0394ca3af60c0a579

Review URL: https://codereview.chromium.org/806943002
---
 src/gpu/gl/GrGLCaps.cpp  |  9 +++++++++
 src/gpu/gl/GrGLCaps.h    |  4 ++++
 src/gpu/gl/GrGLDefines.h |  1 +
 src/gpu/gl/GrGpuGL.cpp   | 27 ++++++++++-----------------
 4 files changed, 24 insertions(+), 17 deletions(-)

(limited to 'src')

diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 8b26282968..c1eb6e10e2 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -44,6 +44,7 @@ void GrGLCaps::reset() {
     fTwoFormatLimit = false;
     fFragCoordsConventionSupport = false;
     fVertexArrayObjectSupport = false;
+    fES2CompatibilitySupport = false;
     fUseNonVBOVertexAndIndexDynamicData = false;
     fIsCoreProfile = false;
     fFullClearIsFree = false;
@@ -86,6 +87,7 @@ GrGLCaps& GrGLCaps::operator= (const GrGLCaps& caps) {
     fTwoFormatLimit = caps.fTwoFormatLimit;
     fFragCoordsConventionSupport = caps.fFragCoordsConventionSupport;
     fVertexArrayObjectSupport = caps.fVertexArrayObjectSupport;
+    fES2CompatibilitySupport = caps.fES2CompatibilitySupport;
     fUseNonVBOVertexAndIndexDynamicData = caps.fUseNonVBOVertexAndIndexDynamicData;
     fIsCoreProfile = caps.fIsCoreProfile;
     fFullClearIsFree = caps.fFullClearIsFree;
@@ -239,6 +241,13 @@ bool GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
                                     ctxInfo.hasExtension("GL_OES_vertex_array_object");
     }
 
+    if (kGL_GrGLStandard == standard) {
+        fES2CompatibilitySupport = ctxInfo.hasExtension("GL_ARB_ES2_compatibility");
+    }
+    else {
+        fES2CompatibilitySupport = true;
+    }
+
     if (kGLES_GrGLStandard == standard) {
         if (ctxInfo.hasExtension("GL_EXT_shader_framebuffer_fetch")) {
             fFBFetchSupport = true;
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index 19e9b878de..0018263b02 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -245,6 +245,9 @@ public:
     /// Is there support for Vertex Array Objects?
     bool vertexArrayObjectSupport() const { return fVertexArrayObjectSupport; }
 
+    /// Is there support for ES2 compatability?
+    bool ES2CompatibilitySupport() const { return fES2CompatibilitySupport; }
+
     /// Use indices or vertices in CPU arrays rather than VBOs for dynamic content.
     bool useNonVBOVertexAndIndexDynamicData() const {
         return fUseNonVBOVertexAndIndexDynamicData;
@@ -364,6 +367,7 @@ private:
     bool fTwoFormatLimit : 1;
     bool fFragCoordsConventionSupport : 1;
     bool fVertexArrayObjectSupport : 1;
+    bool fES2CompatibilitySupport : 1;
     bool fUseNonVBOVertexAndIndexDynamicData : 1;
     bool fIsCoreProfile : 1;
     bool fFullClearIsFree : 1;
diff --git a/src/gpu/gl/GrGLDefines.h b/src/gpu/gl/GrGLDefines.h
index dc9468fd1e..0eb5149a8c 100644
--- a/src/gpu/gl/GrGLDefines.h
+++ b/src/gpu/gl/GrGLDefines.h
@@ -736,6 +736,7 @@
 #define GR_GL_RGB565                         0x8D62
 #define GR_GL_RGBA8                          0x8058
 #define GR_GL_RGBA32F                        0x8814
+#define GR_GL_RGB5                           0x8050
 #define GR_GL_RGB8                           0x8051
 #define GR_GL_BGRA8                          0x93A1
 #define GR_GL_SRGB                           0x8C40
diff --git a/src/gpu/gl/GrGpuGL.cpp b/src/gpu/gl/GrGpuGL.cpp
index 2965cd4007..7d3920fad9 100644
--- a/src/gpu/gl/GrGpuGL.cpp
+++ b/src/gpu/gl/GrGpuGL.cpp
@@ -554,21 +554,14 @@ bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
         useTexStorage = desc.fConfig != kRGB_565_GrPixelConfig;
     }
 
-    GrGLenum internalFormat;
-    GrGLenum externalFormat = 0x0; // suprress warning
-    GrGLenum externalType = 0x0;// suprress warning
-
-    // glTexStorage requires sized internal formats on both desktop and ES. ES2 requires an unsized
-    // format for glTexImage, unlike ES3 and desktop. However, we allow the driver to decide the
-    // size of the internal format whenever possible and so only use a sized internal format when
-    // using texture storage.
-    bool useSizedFormat = useTexStorage;
-    // Many versions of the ES3 drivers on various platforms will not accept GL_RED in
-    // glTexImage2D for the internal format but will accept GL_R8.
-    if (kGLES_GrGLStandard == this->glStandard() && this->glVersion() >= GR_GL_VER(3, 0) &&
-        kAlpha_8_GrPixelConfig == dataConfig) {
-        useSizedFormat = true;
-    }
+    GrGLenum internalFormat = 0x0; // suppress warning
+    GrGLenum externalFormat = 0x0; // suppress warning
+    GrGLenum externalType = 0x0;   // suppress warning
+
+    // glTexStorage requires sized internal formats on both desktop and ES.
+    // ES2 requires an unsized format for glTexImage. On ES3 and desktop we default to sized.
+    bool useSizedFormat = useTexStorage || kGL_GrGLStandard == this->glStandard() ||
+                          this->glVersion() >= GR_GL_VER(3, 0);
     if (!this->configToGLFormats(dataConfig, useSizedFormat, &internalFormat,
                                  &externalFormat, &externalType)) {
         return false;
@@ -2276,8 +2269,8 @@ bool GrGLGpu::configToGLFormats(GrPixelConfig config,
             *internalFormat = GR_GL_RGB;
             *externalFormat = GR_GL_RGB;
             if (getSizedInternalFormat) {
-                if (this->glStandard() == kGL_GrGLStandard) {
-                    return false;
+                if (!this->glCaps().ES2CompatibilitySupport()) {
+                    *internalFormat = GR_GL_RGB5;
                 } else {
                     *internalFormat = GR_GL_RGB565;
                 }
-- 
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