/* * Copyright (C) 2011 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 "config.h" #if ENABLE(WEBGL) #include "WebGLCompressedTextures.h" #include "Extensions3D.h" #include "WebGLRenderingContext.h" #include #include namespace WebCore { WebGLCompressedTextures::WebGLCompressedTextures(WebGLRenderingContext* context) : WebGLExtension(context) , m_supportsDxt1(false) , m_supportsDxt5(false) , m_supportsEtc1(false) , m_supportsPvrtc(false) { Extensions3D* extensions = context->graphicsContext3D()->getExtensions(); if (extensions->supports("GL_EXT_texture_compression_dxt1")) { extensions->ensureEnabled("GL_EXT_texture_compression_dxt1"); m_supportsDxt1 = true; } if (extensions->supports("GL_EXT_texture_compression_s3tc")) { extensions->ensureEnabled("GL_EXT_texture_compression_s3tc"); m_supportsDxt1 = true; m_supportsDxt5 = true; } if (extensions->supports("GL_CHROMIUM_texture_compression_dxt5")) { extensions->ensureEnabled("GL_CHROMIUM_texture_compression_dxt5"); m_supportsDxt5 = true; } if (extensions->supports("GL_OES_compressed_ETC1_RGB8_texture")) { extensions->ensureEnabled("GL_OES_compressed_ETC1_RGB8_texture"); m_supportsEtc1 = true; } if (extensions->supports("GL_IMG_texture_compression_pvrtc")) { extensions->ensureEnabled("GL_IMG_texture_compression_pvrtc"); m_supportsPvrtc = true; } if (m_supportsDxt1) { m_formats.append(Extensions3D::COMPRESSED_RGB_S3TC_DXT1_EXT); m_formats.append(Extensions3D::COMPRESSED_RGBA_S3TC_DXT1_EXT); } if (m_supportsDxt5) m_formats.append(Extensions3D::COMPRESSED_RGBA_S3TC_DXT5_EXT); if (m_supportsEtc1) m_formats.append(Extensions3D::ETC1_RGB8_OES); if (m_supportsPvrtc) { m_formats.append(Extensions3D::COMPRESSED_RGB_PVRTC_4BPPV1_IMG); m_formats.append(Extensions3D::COMPRESSED_RGBA_PVRTC_4BPPV1_IMG); } } WebGLCompressedTextures::~WebGLCompressedTextures() { } WebGLExtension::ExtensionName WebGLCompressedTextures::getName() const { return WebKitWebGLCompressedTexturesName; } PassOwnPtr WebGLCompressedTextures::create(WebGLRenderingContext* context) { return adoptPtr(new WebGLCompressedTextures(context)); } bool WebGLCompressedTextures::supported(WebGLRenderingContext* context) { Extensions3D* extensions = context->graphicsContext3D()->getExtensions(); return extensions->supports("GL_EXT_texture_compression_dxt1") || extensions->supports("GL_EXT_texture_compression_s3tc") || extensions->supports("GL_CHROMIUM_texture_compression_dxt5") || extensions->supports("GL_OES_compressed_ETC1_RGB8_texture") || extensions->supports("GL_IMG_texture_compression_pvrtc"); } bool WebGLCompressedTextures::validateCompressedTexFormat(GC3Denum format) { switch (format) { case Extensions3D::COMPRESSED_RGB_S3TC_DXT1_EXT: case Extensions3D::COMPRESSED_RGBA_S3TC_DXT1_EXT: return m_supportsDxt1; case Extensions3D::ETC1_RGB8_OES: return m_supportsEtc1; case Extensions3D::COMPRESSED_RGBA_S3TC_DXT5_EXT: return m_supportsDxt5; case Extensions3D::COMPRESSED_RGB_PVRTC_4BPPV1_IMG: case Extensions3D::COMPRESSED_RGBA_PVRTC_4BPPV1_IMG: return m_supportsPvrtc; } return false; } bool WebGLCompressedTextures::validateCompressedTexFuncData(GC3Dsizei width, GC3Dsizei height, GC3Denum format, ArrayBufferView* pixels) { GraphicsContext3D* context = m_context->graphicsContext3D(); if (!pixels) { context->synthesizeGLError(GraphicsContext3D::INVALID_VALUE); return false; } if (width < 0 || height < 0) { context->synthesizeGLError(GraphicsContext3D::INVALID_VALUE); return false; } unsigned int bytesRequired = 0; switch (format) { case Extensions3D::COMPRESSED_RGB_S3TC_DXT1_EXT: case Extensions3D::COMPRESSED_RGBA_S3TC_DXT1_EXT: case Extensions3D::ETC1_RGB8_OES: { const int kBlockWidth = 4; const int kBlockHeight = 4; const int kBlockSize = 8; int numBlocksAcross = (width + kBlockWidth - 1) / kBlockWidth; int numBlocksDown = (height + kBlockHeight - 1) / kBlockHeight; int numBlocks = numBlocksAcross * numBlocksDown; bytesRequired = numBlocks * kBlockSize; } break; case Extensions3D::COMPRESSED_RGBA_S3TC_DXT5_EXT: { const int kBlockWidth = 4; const int kBlockHeight = 4; const int kBlockSize = 16; int numBlocksAcross = (width + kBlockWidth - 1) / kBlockWidth; int numBlocksDown = (height + kBlockHeight - 1) / kBlockHeight; int numBlocks = numBlocksAcross * numBlocksDown; bytesRequired = numBlocks * kBlockSize; } break; case Extensions3D::COMPRESSED_RGB_PVRTC_4BPPV1_IMG: case Extensions3D::COMPRESSED_RGBA_PVRTC_4BPPV1_IMG: { bytesRequired = (std::max(width, 8) * std::max(height, 8) + 7) / 8; } break; default: context->synthesizeGLError(GraphicsContext3D::INVALID_ENUM); return false; } if (pixels->byteLength() != bytesRequired) { context->synthesizeGLError(GraphicsContext3D::INVALID_VALUE); return false; } return true; } bool WebGLCompressedTextures::validateCompressedTexSubDimensions(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dsizei width, GC3Dsizei height, GC3Denum format, WebGLTexture* tex) { switch (format) { case Extensions3D::COMPRESSED_RGB_S3TC_DXT1_EXT: case Extensions3D::COMPRESSED_RGBA_S3TC_DXT1_EXT: case Extensions3D::COMPRESSED_RGBA_S3TC_DXT5_EXT: case Extensions3D::ETC1_RGB8_OES: { const int kBlockWidth = 4; const int kBlockHeight = 4; if ((xoffset % kBlockWidth) || (yoffset % kBlockHeight)) return false; if (!xoffset) { if (width != tex->getWidth(target, level)) return false; } else { if (width % kBlockWidth) return false; } if (!yoffset) { if (height != tex->getHeight(target, level)) return false; } else { if (height % kBlockHeight) return false; } return true; } case Extensions3D::COMPRESSED_RGB_PVRTC_4BPPV1_IMG: case Extensions3D::COMPRESSED_RGBA_PVRTC_4BPPV1_IMG: { if (xoffset || yoffset || width != tex->getWidth(target, level) || height != tex->getHeight(target, level)) { return false; } return true; } } return false; } void WebGLCompressedTextures::compressedTexImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, ArrayBufferView* data) { GraphicsContext3D* context = m_context->graphicsContext3D(); if (m_context->isContextLost()) return; if (!validateCompressedTexFormat(internalformat)) { context->synthesizeGLError(GraphicsContext3D::INVALID_ENUM); return; } if (border) { context->synthesizeGLError(GraphicsContext3D::INVALID_VALUE); return; } if (!validateCompressedTexFuncData(width, height, internalformat, data)) return; WebGLTexture* tex = m_context->validateTextureBinding(target, true); if (!tex) return; if (!m_context->isGLES2NPOTStrict()) { if (level && WebGLTexture::isNPOT(width, height)) { context->synthesizeGLError(GraphicsContext3D::INVALID_VALUE); return; } } context->compressedTexImage2D(target, level, internalformat, width, height, border, data->byteLength(), data->baseAddress()); tex->setLevelInfo(target, level, internalformat, width, height, GraphicsContext3D::UNSIGNED_BYTE); m_context->cleanupAfterGraphicsCall(false); } void WebGLCompressedTextures::compressedTexSubImage2D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dsizei width, GC3Dsizei height, GC3Denum format, ArrayBufferView* data) { GraphicsContext3D* context = m_context->graphicsContext3D(); if (m_context->isContextLost()) return; if (!validateCompressedTexFormat(format)) { context->synthesizeGLError(GraphicsContext3D::INVALID_ENUM); return; } if (!validateCompressedTexFuncData(width, height, format, data)) return; WebGLTexture* tex = m_context->validateTextureBinding(target, true); if (!tex) return; if (format != tex->getInternalFormat(target, level)) { context->synthesizeGLError(GraphicsContext3D::INVALID_VALUE); return; } if (!validateCompressedTexSubDimensions(target, level, xoffset, yoffset, width, height, format, tex)) { context->synthesizeGLError(GraphicsContext3D::INVALID_OPERATION); return; } context->compressedTexSubImage2D(target, level, xoffset, yoffset, width, height, format, data->byteLength(), data->baseAddress()); m_context->cleanupAfterGraphicsCall(false); } WebGLGetInfo WebGLCompressedTextures::getCompressedTextureFormats() { return WebGLGetInfo(Int32Array::create(&m_formats[0], m_formats.size())); } } // namespace WebCore #endif // ENABLE(WEBGL)