void DrawingBuffer::initialize(const IntSize& size)
{
ASSERT(m_context);
m_attributes = m_context->getContextAttributes();
if (m_attributes.alpha) {
m_internalColorFormat = GraphicsContext3D::RGBA;
m_colorFormat = GraphicsContext3D::RGBA;
m_internalRenderbufferFormat = Extensions3D::RGBA8_OES;
} else {
m_internalColorFormat = GraphicsContext3D::RGB;
m_colorFormat = GraphicsContext3D::RGB;
m_internalRenderbufferFormat = Extensions3D::RGB8_OES;
}
m_context->getIntegerv(GraphicsContext3D::MAX_TEXTURE_SIZE, &m_maxTextureSize);
m_fbo = m_context->createFramebuffer();
if (m_separateFrontTexture)
m_frontColorBuffer = createColorTexture();
m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
m_colorBuffer = createColorTexture();
m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, m_colorBuffer, 0);
createSecondaryBuffers();
reset(size);
#if ENABLE(CANVAS_USES_MAILBOX)
m_lastColorBuffer = createNewMailbox(m_colorBuffer);
#endif // ENABLE(CANVAS_USES_MAILBOX)
}
DrawingBuffer::DrawingBuffer(GraphicsContext3D* context,
const IntSize& size,
bool multisampleExtensionSupported,
bool packedDepthStencilExtensionSupported)
: m_context(context)
, m_size(size)
, m_multisampleExtensionSupported(multisampleExtensionSupported)
, m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
, m_fbo(0)
, m_colorBuffer(0)
, m_depthStencilBuffer(0)
, m_depthBuffer(0)
, m_stencilBuffer(0)
, m_multisampleFBO(0)
, m_multisampleColorBuffer(0)
, m_internal(new DrawingBufferInternal)
{
if (!m_context->getExtensions()->supports("GL_CHROMIUM_copy_texture_to_parent_texture")) {
m_context.clear();
return;
}
m_fbo = context->createFramebuffer();
context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
m_colorBuffer = generateColorTexture(context, size);
createSecondaryBuffers();
reset(size);
}
DrawingBuffer::DrawingBuffer(GraphicsContext3D* context,
const IntSize& size,
bool multisampleExtensionSupported,
bool packedDepthStencilExtensionSupported,
PreserveDrawingBuffer preserveDrawingBuffer,
AlphaRequirement alpha)
: m_preserveDrawingBuffer(preserveDrawingBuffer)
, m_alpha(alpha)
, m_scissorEnabled(false)
, m_texture2DBinding(0)
, m_framebufferBinding(0)
, m_activeTextureUnit(GraphicsContext3D::TEXTURE0)
, m_context(context)
, m_size(-1, -1)
, m_multisampleExtensionSupported(multisampleExtensionSupported)
, m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
, m_fbo(context->createFramebuffer())
, m_colorBuffer(0)
, m_frontColorBuffer(0)
, m_separateFrontTexture(false)
, m_depthStencilBuffer(0)
, m_depthBuffer(0)
, m_stencilBuffer(0)
, m_multisampleFBO(0)
, m_multisampleColorBuffer(0)
{
ASSERT(m_fbo);
if (!m_fbo) {
clear();
return;
}
// create a texture to render into
m_colorBuffer = context->createTexture();
context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
createSecondaryBuffers();
reset(size);
}
DrawingBuffer::DrawingBuffer(GraphicsContext3D* context,
const IntSize& size,
bool multisampleExtensionSupported,
bool packedDepthStencilExtensionSupported)
: m_context(context)
, m_size(-1, -1)
, m_multisampleExtensionSupported(multisampleExtensionSupported)
, m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
, m_fbo(context->createFramebuffer())
, m_colorBuffer(0)
, m_depthStencilBuffer(0)
, m_depthBuffer(0)
, m_stencilBuffer(0)
, m_multisampleFBO(0)
, m_multisampleColorBuffer(0)
{
#if 0
ASSERT(m_fbo);
if (!m_fbo) {
clear();
return;
}
// create a texture to render into
m_colorBuffer = context->createTexture();
context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
// Create the FBO
m_fbo = context->createFramebuffer();
ASSERT(m_fbo);
if (!m_fbo) {
clear();
return;
}
createSecondaryBuffers();
reset(size);
#endif
}
DrawingBuffer::DrawingBuffer(GraphicsContext3D* context,
const IntSize& size,
bool multisampleExtensionSupported,
bool packedDepthStencilExtensionSupported,
bool separateBackingTexture)
: m_separateBackingTexture(separateBackingTexture)
, m_scissorEnabled(false)
, m_texture2DBinding(0)
, m_activeTextureUnit(GraphicsContext3D::TEXTURE0)
, m_context(context)
, m_size(-1, -1)
, m_multisampleExtensionSupported(multisampleExtensionSupported)
, m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
, m_fbo(context->createFramebuffer())
, m_colorBuffer(0)
, m_depthStencilBuffer(0)
, m_depthBuffer(0)
, m_stencilBuffer(0)
, m_multisampleFBO(0)
, m_multisampleColorBuffer(0)
{
// Support for a separate backing texture has only been enabled for
// the chromium port.
ASSERT(!m_separateBackingTexture);
ASSERT(m_fbo);
if (!m_fbo) {
clear();
return;
}
// create a texture to render into
m_colorBuffer = context->createTexture();
context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
createSecondaryBuffers();
reset(size);
}
void DrawingBuffer::initialize(const IntSize& size)
{
ASSERT(m_context);
m_attributes = m_context->getContextAttributes();
Extensions3DUtil extensionsUtil(m_context);
if (m_attributes.alpha) {
m_internalColorFormat = GL_RGBA;
m_colorFormat = GL_RGBA;
m_internalRenderbufferFormat = GL_RGBA8_OES;
} else {
m_internalColorFormat = GL_RGB;
m_colorFormat = GL_RGB;
m_internalRenderbufferFormat = GL_RGB8_OES;
}
m_context->getIntegerv(GL_MAX_TEXTURE_SIZE, &m_maxTextureSize);
int maxSampleCount = 0;
m_multisampleMode = None;
if (m_attributes.antialias && m_multisampleExtensionSupported) {
m_context->getIntegerv(GL_MAX_SAMPLES_ANGLE, &maxSampleCount);
m_multisampleMode = ExplicitResolve;
if (extensionsUtil.supportsExtension("GL_EXT_multisampled_render_to_texture"))
m_multisampleMode = ImplicitResolve;
}
m_sampleCount = std::min(4, maxSampleCount);
m_fbo = m_context->createFramebuffer();
m_context->bindFramebuffer(GL_FRAMEBUFFER, m_fbo);
m_colorBuffer = createColorTexture();
if (m_multisampleMode == ImplicitResolve)
m_context->framebufferTexture2DMultisampleEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_colorBuffer, 0, m_sampleCount);
else
m_context->framebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_colorBuffer, 0);
createSecondaryBuffers();
reset(size);
}
