void
WebGL2Context::BlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
GLbitfield mask, GLenum filter)
{
if (IsContextLost())
return;
const GLbitfield validBits = LOCAL_GL_COLOR_BUFFER_BIT |
LOCAL_GL_DEPTH_BUFFER_BIT |
LOCAL_GL_STENCIL_BUFFER_BIT;
if ((mask | validBits) != validBits) {
ErrorInvalidValue("blitFramebuffer: Invalid bit set in mask.");
return;
}
switch (filter) {
case LOCAL_GL_NEAREST:
case LOCAL_GL_LINEAR:
break;
default:
ErrorInvalidEnumInfo("blitFramebuffer: Bad `filter`:", filter);
return;
}
const GLbitfield depthAndStencilBits = LOCAL_GL_DEPTH_BUFFER_BIT |
LOCAL_GL_STENCIL_BUFFER_BIT;
if (mask & depthAndStencilBits &&
filter != LOCAL_GL_NEAREST)
{
ErrorInvalidOperation("blitFramebuffer: DEPTH_BUFFER_BIT and"
" STENCIL_BUFFER_BIT can only be used with"
" NEAREST filtering.");
return;
}
if (mBoundReadFramebuffer == mBoundDrawFramebuffer) {
// TODO: It's actually more complicated than this. We need to check that
// the underlying buffers are not the same, not the framebuffers
// themselves.
ErrorInvalidOperation("blitFramebuffer: Source and destination must"
" differ.");
return;
}
GLsizei srcSamples;
const webgl::FormatInfo* srcColorFormat = nullptr;
const webgl::FormatInfo* srcDepthFormat = nullptr;
const webgl::FormatInfo* srcStencilFormat = nullptr;
if (mBoundReadFramebuffer) {
if (!mBoundReadFramebuffer->ValidateAndInitAttachments("blitFramebuffer's READ_FRAMEBUFFER"))
return;
if (!GetFBInfoForBlit(mBoundReadFramebuffer, "READ_FRAMEBUFFER", &srcSamples,
&srcColorFormat, &srcDepthFormat, &srcStencilFormat))
{
return;
}
} else {
srcSamples = 0; // Always 0.
GetBackbufferFormats(mOptions, &srcColorFormat, &srcDepthFormat,
&srcStencilFormat);
}
GLsizei dstSamples;
const webgl::FormatInfo* dstColorFormat = nullptr;
const webgl::FormatInfo* dstDepthFormat = nullptr;
const webgl::FormatInfo* dstStencilFormat = nullptr;
if (mBoundDrawFramebuffer) {
if (!mBoundDrawFramebuffer->ValidateAndInitAttachments("blitFramebuffer's DRAW_FRAMEBUFFER"))
return;
if (!GetFBInfoForBlit(mBoundDrawFramebuffer, "DRAW_FRAMEBUFFER", &dstSamples,
&dstColorFormat, &dstDepthFormat, &dstStencilFormat))
{
return;
}
} else {
dstSamples = gl->Screen()->Samples();
GetBackbufferFormats(mOptions, &dstColorFormat, &dstDepthFormat,
&dstStencilFormat);
}
if (mask & LOCAL_GL_COLOR_BUFFER_BIT) {
const auto fnSignlessType = [](const webgl::FormatInfo* format)
-> webgl::ComponentType
{
if (!format)
return webgl::ComponentType::None;
switch (format->componentType) {
case webgl::ComponentType::UInt:
return webgl::ComponentType::Int;
case webgl::ComponentType::NormUInt:
return webgl::ComponentType::NormInt;
default:
return format->componentType;
}
};
const auto srcType = fnSignlessType(srcColorFormat);
const auto dstType = fnSignlessType(dstColorFormat);
if (srcType != dstType) {
ErrorInvalidOperation("blitFramebuffer: Color buffer format component type"
" mismatch.");
return;
}
const bool srcIsInt = (srcType == webgl::ComponentType::Int);
if (srcIsInt && filter != LOCAL_GL_NEAREST) {
ErrorInvalidOperation("blitFramebuffer: Integer read buffers can only"
" be filtered with NEAREST.");
return;
}
}
/* GLES 3.0.4, p199:
* Calling BlitFramebuffer will result in an INVALID_OPERATION error if
* mask includes DEPTH_BUFFER_BIT or STENCIL_BUFFER_BIT, and the source
* and destination depth and stencil buffer formats do not match.
*
* jgilbert: The wording is such that if only DEPTH_BUFFER_BIT is specified,
* the stencil formats must match. This seems wrong. It could be a spec bug,
* or I could be missing an interaction in one of the earlier paragraphs.
*/
if (mask & LOCAL_GL_DEPTH_BUFFER_BIT &&
dstDepthFormat != srcDepthFormat)
{
ErrorInvalidOperation("blitFramebuffer: Depth buffer formats must match"
" if selected.");
return;
}
if (mask & LOCAL_GL_STENCIL_BUFFER_BIT &&
dstStencilFormat != srcStencilFormat)
{
ErrorInvalidOperation("blitFramebuffer: Stencil buffer formats must"
" match if selected.");
return;
}
if (dstSamples != 0) {
ErrorInvalidOperation("blitFramebuffer: DRAW_FRAMEBUFFER may not have"
" multiple samples.");
return;
}
if (srcSamples != 0) {
if (mask & LOCAL_GL_COLOR_BUFFER_BIT &&
dstColorFormat != srcColorFormat)
{
ErrorInvalidOperation("blitFramebuffer: Color buffer formats must"
" match if selected, when reading from a"
" multisampled source.");
return;
}
if (dstX0 != srcX0 ||
dstX1 != srcX1 ||
dstY0 != srcY0 ||
dstY1 != srcY1)
{
ErrorInvalidOperation("blitFramebuffer: If the source is"
" multisampled, then the source and dest"
" regions must match exactly.");
return;
}
}
MakeContextCurrent();
gl->fBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
dstX0, dstY0, dstX1, dstY1,
mask, filter);
}
void
WebGL2Context::BlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
GLbitfield mask, GLenum filter)
{
const GLbitfield validBits = LOCAL_GL_COLOR_BUFFER_BIT |
LOCAL_GL_DEPTH_BUFFER_BIT |
LOCAL_GL_STENCIL_BUFFER_BIT;
if ((mask | validBits) != validBits) {
ErrorInvalidValue("blitFramebuffer: Invalid bit set in mask.");
return;
}
switch (filter) {
case LOCAL_GL_NEAREST:
case LOCAL_GL_LINEAR:
break;
default:
ErrorInvalidEnumInfo("blitFramebuffer: Bad `filter`:", filter);
return;
}
const GLbitfield depthAndStencilBits = LOCAL_GL_DEPTH_BUFFER_BIT |
LOCAL_GL_STENCIL_BUFFER_BIT;
if (mask & depthAndStencilBits &&
filter != LOCAL_GL_NEAREST)
{
ErrorInvalidOperation("blitFramebuffer: DEPTH_BUFFER_BIT and"
" STENCIL_BUFFER_BIT can only be used with"
" NEAREST filtering.");
return;
}
if (mBoundReadFramebuffer == mBoundDrawFramebuffer) {
// TODO: It's actually more complicated than this. We need to check that
// the underlying buffers are not the same, not the framebuffers
// themselves.
ErrorInvalidOperation("blitFramebuffer: Source and destination must"
" differ.");
return;
}
GLsizei srcSamples;
GLenum srcColorFormat;
GLenum srcDepthFormat;
GLenum srcStencilFormat;
if (mBoundReadFramebuffer) {
if (!GetFBInfoForBlit(mBoundReadFramebuffer, this, "READ_FRAMEBUFFER",
&srcSamples, &srcColorFormat, &srcDepthFormat,
&srcStencilFormat))
{
return;
}
} else {
srcSamples = 1; // Always 1.
// TODO: Don't hardcode these.
srcColorFormat = mOptions.alpha ? LOCAL_GL_RGBA8 : LOCAL_GL_RGB8;
if (mOptions.depth && mOptions.stencil) {
srcDepthFormat = LOCAL_GL_DEPTH24_STENCIL8;
srcStencilFormat = srcDepthFormat;
} else {
if (mOptions.depth) {
srcDepthFormat = LOCAL_GL_DEPTH_COMPONENT16;
}
if (mOptions.stencil) {
srcStencilFormat = LOCAL_GL_STENCIL_INDEX8;
}
}
}
GLsizei dstSamples;
GLenum dstColorFormat;
GLenum dstDepthFormat;
GLenum dstStencilFormat;
if (mBoundDrawFramebuffer) {
if (!GetFBInfoForBlit(mBoundDrawFramebuffer, this, "DRAW_FRAMEBUFFER",
&dstSamples, &dstColorFormat, &dstDepthFormat,
&dstStencilFormat))
{
return;
}
} else {
dstSamples = gl->Screen()->Samples();
// TODO: Don't hardcode these.
dstColorFormat = mOptions.alpha ? LOCAL_GL_RGBA8 : LOCAL_GL_RGB8;
if (mOptions.depth && mOptions.stencil) {
dstDepthFormat = LOCAL_GL_DEPTH24_STENCIL8;
dstStencilFormat = dstDepthFormat;
} else {
if (mOptions.depth) {
dstDepthFormat = LOCAL_GL_DEPTH_COMPONENT16;
}
if (mOptions.stencil) {
dstStencilFormat = LOCAL_GL_STENCIL_INDEX8;
}
}
}
if (mask & LOCAL_GL_COLOR_BUFFER_BIT) {
const GLenum srcColorType = srcColorFormat ? ValueTypeForFormat(srcColorFormat)
: 0;
const GLenum dstColorType = dstColorFormat ? ValueTypeForFormat(dstColorFormat)
: 0;
if (dstColorType != srcColorType) {
ErrorInvalidOperation("blitFramebuffer: Color buffer value type"
" mismatch.");
return;
}
const bool srcIsInt = srcColorType == LOCAL_GL_INT ||
srcColorType == LOCAL_GL_UNSIGNED_INT;
if (srcIsInt && filter != LOCAL_GL_NEAREST) {
ErrorInvalidOperation("blitFramebuffer: Integer read buffers can only"
" be filtered with NEAREST.");
return;
}
}
/* GLES 3.0.4, p199:
* Calling BlitFramebuffer will result in an INVALID_OPERATION error if
* mask includes DEPTH_BUFFER_BIT or STENCIL_BUFFER_BIT, and the source
* and destination depth and stencil buffer formats do not match.
*
* jgilbert: The wording is such that if only DEPTH_BUFFER_BIT is specified,
* the stencil formats must match. This seems wrong. It could be a spec bug,
* or I could be missing an interaction in one of the earlier paragraphs.
*/
if (mask & LOCAL_GL_DEPTH_BUFFER_BIT &&
dstDepthFormat != srcDepthFormat)
{
ErrorInvalidOperation("blitFramebuffer: Depth buffer formats must match"
" if selected.");
return;
}
if (mask & LOCAL_GL_STENCIL_BUFFER_BIT &&
dstStencilFormat != srcStencilFormat)
{
ErrorInvalidOperation("blitFramebuffer: Stencil buffer formats must"
" match if selected.");
return;
}
if (dstSamples != 1) {
ErrorInvalidOperation("blitFramebuffer: DRAW_FRAMEBUFFER may not have"
" multiple samples.");
return;
}
if (srcSamples != 1) {
if (mask & LOCAL_GL_COLOR_BUFFER_BIT &&
dstColorFormat != srcColorFormat)
{
ErrorInvalidOperation("blitFramebuffer: Color buffer formats must"
" match if selected, when reading from a"
" multisampled source.");
return;
}
if (dstX0 != srcX0 ||
dstX1 != srcX1 ||
dstY0 != srcY0 ||
dstY1 != srcY1)
{
ErrorInvalidOperation("blitFramebuffer: If the source is"
" multisampled, then the source and dest"
" regions must match exactly.");
return;
}
}
MakeContextCurrent();
gl->fBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
dstX0, dstY0, dstX1, dstY1,
mask, filter);
}