This source file includes following definitions.
- name
- create
- supported
- extensionName
- drawBuffersWEBGL
- satisfiesWebGLRequirements
#include "config.h"
#include "core/html/canvas/WebGLDrawBuffers.h"
namespace WebCore {
WebGLDrawBuffers::WebGLDrawBuffers(WebGLRenderingContextBase* context)
: WebGLExtension(context)
{
ScriptWrappable::init(this);
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));
}
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;
}
GLenum value = (bufs[0] == GL_BACK) ? GL_COLOR_ATTACHMENT0 : GL_NONE;
m_context->webGraphicsContext3D()->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);
}
}
bool WebGLDrawBuffers::satisfiesWebGLRequirements(WebGLRenderingContextBase* webglContext)
{
blink::WebGraphicsContext3D* context = webglContext->webGraphicsContext3D();
Extensions3DUtil* extensionsUtil = webglContext->extensionsUtil();
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;
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;
}
}