Implement the texture uploading of ASTC compression for WebGL(part II)

Source/modules/webgl/WebGLCompressedTextureASTC.cpp

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#include "modules/webgl/WebGLCompressedTextureASTC.h"
+
+#include "modules/webgl/WebGLRenderingContextBase.h"
+
+namespace blink {
+
+const WebGLCompressedTextureASTC::BlockSizeCompressASTC
+    WebGLCompressedTextureASTC::kBlockSizeCompressASTC[] =
+    {
+        GL_COMPRESSED_RGBA_ASTC_4x4_KHR,           4, 4,
+        GL_COMPRESSED_RGBA_ASTC_5x4_KHR,           5, 4,
+        GL_COMPRESSED_RGBA_ASTC_5x5_KHR,           5, 5,
+        GL_COMPRESSED_RGBA_ASTC_6x5_KHR,           6, 5,
+        GL_COMPRESSED_RGBA_ASTC_6x6_KHR,           6, 6,
+        GL_COMPRESSED_RGBA_ASTC_8x5_KHR,           8, 5,
+        GL_COMPRESSED_RGBA_ASTC_8x6_KHR,           8, 6,
+        GL_COMPRESSED_RGBA_ASTC_8x8_KHR,           8, 8,
+        GL_COMPRESSED_RGBA_ASTC_10x5_KHR,          10, 5,
+        GL_COMPRESSED_RGBA_ASTC_10x6_KHR,          10, 6,
+        GL_COMPRESSED_RGBA_ASTC_10x8_KHR,          10, 8,
+        GL_COMPRESSED_RGBA_ASTC_10x10_KHR,         10, 10,
+        GL_COMPRESSED_RGBA_ASTC_12x10_KHR,         12, 10,
+        GL_COMPRESSED_RGBA_ASTC_12x12_KHR,         12, 12,
+    };
+
+WebGLCompressedTextureASTC::WebGLCompressedTextureASTC(WebGLRenderingContextBase* context)
+    : WebGLExtension(context)
+{
+    const int kAlphaFormatGap = 0x20;

[Ken Russell (switch to Gerrit), 2015/08/27 03:19:02]

Please compute this as COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR -
GL_COMPRESSED_RGBA_ASTC_4x4_KHR, rather than hardcoding it. There was obviously
already a mistake here previously.

+
+    for (size_t i = 0; i < arraysize(WebGLCompressedTextureASTC::kBlockSizeCompressASTC); i++) {
+        /* GL_COMPRESSED_RGBA_ASTC(0x93B0 ~ 0x93BD) */
+        context->addCompressedTextureFormat(
+            WebGLCompressedTextureASTC::kBlockSizeCompressASTC[i].CompressType);
+        /* GL_COMPRESSED_SRGB8_ALPHA8_ASTC(0x93D0 ~ 0x93DD) */
+        context->addCompressedTextureFormat(
+            WebGLCompressedTextureASTC::kBlockSizeCompressASTC[i].CompressType + kAlphaFormatGap);
+    }
+}
+
+WebGLCompressedTextureASTC::~WebGLCompressedTextureASTC()
+{
+}
+
+WebGLExtensionName WebGLCompressedTextureASTC::name() const
+{
+    return WebGLCompressedTextureASTCName;
+}
+
+WebGLCompressedTextureASTC* WebGLCompressedTextureASTC::create(WebGLRenderingContextBase* context)
+{
+    return new WebGLCompressedTextureASTC(context);
+}
+
+bool WebGLCompressedTextureASTC::supported(WebGLRenderingContextBase* context)
+{
+    Extensions3DUtil* extensionsUtil = context->extensionsUtil();
+    return extensionsUtil->supportsExtension("GL_KHR_texture_compression_astc_ldr");
+}
+
+const char* WebGLCompressedTextureASTC::extensionName()
+{
+    // TODO(cyzero.kim): implement extension for GL_KHR_texture_compression_astc_hdr.
+    return "WEBGL_compressed_texture_astc";
+}
+
+} // namespace blink