Implement WEBGL_compressed_texture_s3tc_srgb

third_party/WebKit/Source/modules/webgl/WebGLCompressedTextureS3TCsRGB.cpp

 /*
- * Copyright (C) 2012 Google Inc. All rights reserved.
+ * Copyright (C) 2016 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "modules/webgl/WebGLDepthTexture.h"
+#include "modules/webgl/WebGLCompressedTextureS3TCsRGB.h"
+
+#include "modules/webgl/WebGLRenderingContextBase.h"
 
 namespace blink {
 
-WebGLDepthTexture::WebGLDepthTexture(WebGLRenderingContextBase* context)
+WebGLCompressedTextureS3TCsRGB::WebGLCompressedTextureS3TCsRGB(WebGLRenderingContextBase* context)
     : WebGLExtension(context)
 {
-    context->extensionsUtil()->ensureExtensionEnabled("GL_CHROMIUM_depth_texture");
+    context->addCompressedTextureFormat(GL_COMPRESSED_SRGB_S3TC_DXT1_NV);
+    context->addCompressedTextureFormat(GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_NV);
+    context->addCompressedTextureFormat(GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_NV);
+    context->addCompressedTextureFormat(GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_NV);
 }
 
-WebGLDepthTexture::~WebGLDepthTexture()
+WebGLCompressedTextureS3TCsRGB::~WebGLCompressedTextureS3TCsRGB()
 {
 }
 
-WebGLExtensionName WebGLDepthTexture::name() const
+WebGLExtensionName WebGLCompressedTextureS3TCsRGB::name() const
 {
-    return WebGLDepthTextureName;
+    return WebGLCompressedTextureS3TCsRGBName;
 }
 
-WebGLDepthTexture* WebGLDepthTexture::create(WebGLRenderingContextBase* context)
+WebGLCompressedTextureS3TCsRGB* WebGLCompressedTextureS3TCsRGB::create(WebGLRenderingContextBase* context)
 {
-    return new WebGLDepthTexture(context);
+    return new WebGLCompressedTextureS3TCsRGB(context);
 }
 
-bool WebGLDepthTexture::supported(WebGLRenderingContextBase* context)
+bool WebGLCompressedTextureS3TCsRGB::supported(WebGLRenderingContextBase* context)
 {
     Extensions3DUtil* extensionsUtil = context->extensionsUtil();
-    // Emulating the UNSIGNED_INT_24_8_WEBGL texture internal format in terms
-    // of two separate texture objects is too difficult, so disable depth
-    // textures unless a packed depth/stencil format is available.
-    if (!extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil"))
-        return false;
-    return extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture")
-        || extensionsUtil->supportsExtension("GL_OES_depth_texture")
-        || extensionsUtil->supportsExtension("GL_ARB_depth_texture");
+    return extensionsUtil->supportsExtension("GL_NV_sRGB_formats");

[Ken Russell (switch to Gerrit), 2016/09/15 00:50:35]

Let's add a TODO here, at least, about changing this to
GL_EXT_texture_compression_s3tc_srgb once it's published.

[Kai Ninomiya, 2016/09/15 20:45:35]

Done.

 }
 
-const char* WebGLDepthTexture::extensionName()
+const char* WebGLCompressedTextureS3TCsRGB::extensionName()
 {
-    return "WEBGL_depth_texture";
+    return "WEBGL_compressed_texture_s3tc_srgb";
 }
 
 } // namespace blink