Remove <canvas>

sky/engine/core/html/canvas/WebGLDrawBuffers.cpp

-/*
- * Copyright (C) 2013 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 "sky/engine/config.h"
-
-#include "sky/engine/core/html/canvas/WebGLDrawBuffers.h"
-
-namespace blink {
-
-WebGLDrawBuffers::WebGLDrawBuffers(WebGLRenderingContextBase* context)
-    : WebGLExtension(context)
-{
-    context->extensionsUtil()->ensureExtensionEnabled("GL_EXT_draw_buffers");
-}
-
-WebGLDrawBuffers::~WebGLDrawBuffers()
-{
-}
-
-WebGLExtensionName WebGLDrawBuffers::name() const
-{
-    return WebGLDrawBuffersName;
-}
-
-PassRefPtr<WebGLDrawBuffers> WebGLDrawBuffers::create(WebGLRenderingContextBase* context)
-{
-    return adoptRef(new WebGLDrawBuffers(context));
-}
-
-// static
-bool WebGLDrawBuffers::supported(WebGLRenderingContextBase* context)
-{
-    return (context->extensionsUtil()->supportsExtension("GL_EXT_draw_buffers")
-        && satisfiesWebGLRequirements(context));
-}
-
-const char* WebGLDrawBuffers::extensionName()
-{
-    return "WEBGL_draw_buffers";
-}
-
-void WebGLDrawBuffers::drawBuffersWEBGL(const Vector<GLenum>& buffers)
-{
-    if (isLost())
-        return;
-    GLsizei n = buffers.size();
-    const GLenum* bufs = buffers.data();
-    if (!m_context->m_framebufferBinding) {
-        if (n != 1) {
-            m_context->synthesizeGLError(GL_INVALID_VALUE, "drawBuffersWEBGL", "more than one buffer");
-            return;
-        }
-        if (bufs[0] != GL_BACK && bufs[0] != GL_NONE) {
-            m_context->synthesizeGLError(GL_INVALID_OPERATION, "drawBuffersWEBGL", "BACK or NONE");
-            return;
-        }
-        // Because the backbuffer is simulated on all current WebKit ports, we need to change BACK to COLOR_ATTACHMENT0.
-        GLenum value = (bufs[0] == GL_BACK) ? GL_COLOR_ATTACHMENT0 : GL_NONE;
-        m_context->webContext()->drawBuffersEXT(1, &value);
-        m_context->setBackDrawBuffer(bufs[0]);
-    } else {
-        if (n > m_context->maxDrawBuffers()) {
-            m_context->synthesizeGLError(GL_INVALID_VALUE, "drawBuffersWEBGL", "more than max draw buffers");
-            return;
-        }
-        for (GLsizei i = 0; i < n; ++i) {
-            if (bufs[i] != GL_NONE && bufs[i] != static_cast<GLenum>(GL_COLOR_ATTACHMENT0_EXT + i)) {
-                m_context->synthesizeGLError(GL_INVALID_OPERATION, "drawBuffersWEBGL", "COLOR_ATTACHMENTi_EXT or NONE");
-                return;
-            }
-        }
-        m_context->m_framebufferBinding->drawBuffers(buffers);
-    }
-}
-
-// static
-bool WebGLDrawBuffers::satisfiesWebGLRequirements(WebGLRenderingContextBase* webglContext)
-{
-    blink::WebGraphicsContext3D* context = webglContext->webContext();
-    Extensions3DUtil* extensionsUtil = webglContext->extensionsUtil();
-
-    // This is called after we make sure GL_EXT_draw_buffers is supported.
-    GLint maxDrawBuffers = 0;
-    GLint maxColorAttachments = 0;
-    context->getIntegerv(GL_MAX_DRAW_BUFFERS_EXT, &maxDrawBuffers);
-    context->getIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &maxColorAttachments);
-    if (maxDrawBuffers < 4 || maxColorAttachments < 4)
-        return false;
-
-    Platform3DObject fbo = context->createFramebuffer();
-    context->bindFramebuffer(GL_FRAMEBUFFER, fbo);
-
-    const unsigned char* buffer = 0; // Chromium doesn't allow init data for depth/stencil tetxures.
-    bool supportsDepth = (extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture")
-        || extensionsUtil->supportsExtension("GL_OES_depth_texture")
-        || extensionsUtil->supportsExtension("GL_ARB_depth_texture"));
-    bool supportsDepthStencil = (extensionsUtil->supportsExtension("GL_EXT_packed_depth_stencil")
-        || extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil"));
-    Platform3DObject depthStencil = 0;
-    if (supportsDepthStencil) {
-        depthStencil = context->createTexture();
-        context->bindTexture(GL_TEXTURE_2D, depthStencil);
-        context->texImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_STENCIL_OES, 1, 1, 0, GL_DEPTH_STENCIL_OES, GL_UNSIGNED_INT_24_8_OES, buffer);
-    }
-    Platform3DObject depth = 0;
-    if (supportsDepth) {
-        depth = context->createTexture();
-        context->bindTexture(GL_TEXTURE_2D, depth);
-        context->texImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 1, 1, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buffer);
-    }
-
-    Vector<Platform3DObject> colors;
-    bool ok = true;
-    GLint maxAllowedBuffers = std::min(maxDrawBuffers, maxColorAttachments);
-    for (GLint i = 0; i < maxAllowedBuffers; ++i) {
-        Platform3DObject color = context->createTexture();
-        colors.append(color);
-        context->bindTexture(GL_TEXTURE_2D, color);
-        context->texImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
-        context->framebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, color, 0);
-        if (context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
-            ok = false;
-            break;
-        }
-        if (supportsDepth) {
-            context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth, 0);
-            if (context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
-                ok = false;
-                break;
-            }
-            context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
-        }
-        if (supportsDepthStencil) {
-            context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
-            context->framebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
-            if (context->checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
-                ok = false;
-                break;
-            }
-            context->framebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
-            context->framebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
-        }
-    }
-
-    webglContext->restoreCurrentFramebuffer();
-    context->deleteFramebuffer(fbo);
-    webglContext->restoreCurrentTexture2D();
-    if (supportsDepth)
-        context->deleteTexture(depth);
-    if (supportsDepthStencil)
-        context->deleteTexture(depthStencil);
-    for (size_t i = 0; i < colors.size(); ++i)
-        context->deleteTexture(colors[i]);
-    return ok;
-}
-
-} // namespace blink