void QGLFramebufferObjectPrivate::init(QGLFramebufferObject *q, const QSize &sz,
QGLFramebufferObject::Attachment attachment,
GLenum texture_target, GLenum internal_format,
GLint samples, bool mipmap)
{
QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext());
funcs.initializeOpenGLFunctions();
if (!funcs.hasOpenGLFeature(QOpenGLFunctions::Framebuffers))
return;
ctx->d_ptr->refreshCurrentFbo();
size = sz;
target = texture_target;
// texture dimensions
QT_RESET_GLERROR(); // reset error state
GLuint fbo = 0;
funcs.glGenFramebuffers(1, &fbo);
funcs.glBindFramebuffer(GL_FRAMEBUFFER, fbo);
GLuint texture = 0;
GLuint color_buffer = 0;
GLuint depth_buffer = 0;
GLuint stencil_buffer = 0;
QT_CHECK_GLERROR();
// init texture
if (samples == 0) {
funcs.glGenTextures(1, &texture);
funcs.glBindTexture(target, texture);
funcs.glTexImage2D(target, 0, internal_format, size.width(), size.height(), 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
if (mipmap) {
int width = size.width();
int height = size.height();
int level = 0;
while (width > 1 || height > 1) {
width = qMax(1, width >> 1);
height = qMax(1, height >> 1);
++level;
funcs.glTexImage2D(target, level, internal_format, width, height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
}
}
funcs.glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
funcs.glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
funcs.glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
funcs.glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
funcs.glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
target, texture, 0);
QT_CHECK_GLERROR();
valid = checkFramebufferStatus();
funcs.glBindTexture(target, 0);
color_buffer = 0;
} else {
void QOpenGLFramebufferObjectPrivate::initTexture(GLenum target, GLenum internal_format,
const QSize &size, bool mipmap)
{
QOpenGLContext *ctx = QOpenGLContext::currentContext();
GLuint texture = 0;
funcs.glGenTextures(1, &texture);
funcs.glBindTexture(target, texture);
funcs.glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
funcs.glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
funcs.glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
funcs.glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
funcs.glTexImage2D(target, 0, internal_format, size.width(), size.height(), 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
if (mipmap) {
int width = size.width();
int height = size.height();
int level = 0;
while (width > 1 || height > 1) {
width = qMax(1, width >> 1);
height = qMax(1, height >> 1);
++level;
funcs.glTexImage2D(target, level, internal_format, width, height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
}
}
funcs.glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
target, texture, 0);
QT_CHECK_GLERROR();
funcs.glBindTexture(target, 0);
valid = checkFramebufferStatus(ctx);
if (valid)
texture_guard = new QOpenGLSharedResourceGuard(ctx, texture, freeTextureFunc);
else
funcs.glDeleteTextures(1, &texture);
}
void QGLFramebufferObjectPrivate::init(QGLFramebufferObject *q, const QSize &sz,
QGLFramebufferObject::Attachment attachment,
GLenum texture_target, GLenum internal_format, GLint samples)
{
QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext());
fbo_guard.setContext(ctx);
bool ext_detected = (QGLExtensions::glExtensions() & QGLExtensions::FramebufferObject);
if (!ext_detected || (ext_detected && !qt_resolve_framebufferobject_extensions(ctx)))
return;
size = sz;
target = texture_target;
// texture dimensions
QT_RESET_GLERROR(); // reset error state
GLuint fbo = 0;
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo);
fbo_guard.setId(fbo);
glDevice.setFBO(q, attachment);
QT_CHECK_GLERROR();
// init texture
if (samples == 0) {
glGenTextures(1, &texture);
glBindTexture(target, texture);
glTexImage2D(target, 0, internal_format, size.width(), size.height(), 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
#ifndef QT_OPENGL_ES
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
#else
glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
#endif
glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
target, texture, 0);
QT_CHECK_GLERROR();
valid = checkFramebufferStatus();
glBindTexture(target, 0);
color_buffer = 0;
} else {
GLint maxSamples;
glGetIntegerv(GL_MAX_SAMPLES_EXT, &maxSamples);
samples = qBound(1, int(samples), int(maxSamples));
glGenRenderbuffers(1, &color_buffer);
glBindRenderbuffer(GL_RENDERBUFFER_EXT, color_buffer);
if (glRenderbufferStorageMultisampleEXT) {
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
internal_format, size.width(), size.height());
} else {
samples = 0;
glRenderbufferStorage(GL_RENDERBUFFER_EXT, internal_format,
size.width(), size.height());
}
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_RENDERBUFFER_EXT, color_buffer);
QT_CHECK_GLERROR();
valid = checkFramebufferStatus();
if (valid)
glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT, GL_RENDERBUFFER_SAMPLES_EXT, &samples);
}
if (attachment == QGLFramebufferObject::CombinedDepthStencil
&& (QGLExtensions::glExtensions() & QGLExtensions::PackedDepthStencil)) {
// depth and stencil buffer needs another extension
glGenRenderbuffers(1, &depth_stencil_buffer);
Q_ASSERT(!glIsRenderbuffer(depth_stencil_buffer));
glBindRenderbuffer(GL_RENDERBUFFER_EXT, depth_stencil_buffer);
Q_ASSERT(glIsRenderbuffer(depth_stencil_buffer));
if (samples != 0 && glRenderbufferStorageMultisampleEXT)
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH24_STENCIL8_EXT, size.width(), size.height());
else
glRenderbufferStorage(GL_RENDERBUFFER_EXT,
GL_DEPTH24_STENCIL8_EXT, size.width(), size.height());
GLint i = 0;
glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT, GL_RENDERBUFFER_DEPTH_SIZE_EXT, &i);
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_stencil_buffer);
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_stencil_buffer);
fbo_attachment = QGLFramebufferObject::CombinedDepthStencil;
valid = checkFramebufferStatus();
if (!valid)
glDeleteRenderbuffers(1, &depth_stencil_buffer);
} else if (attachment == QGLFramebufferObject::Depth
|| attachment == QGLFramebufferObject::CombinedDepthStencil)
{
glGenRenderbuffers(1, &depth_stencil_buffer);
Q_ASSERT(!glIsRenderbuffer(depth_stencil_buffer));
glBindRenderbuffer(GL_RENDERBUFFER_EXT, depth_stencil_buffer);
Q_ASSERT(glIsRenderbuffer(depth_stencil_buffer));
if (samples != 0 && glRenderbufferStorageMultisampleEXT) {
#ifdef QT_OPENGL_ES
#define GL_DEPTH_COMPONENT16 0x81A5
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH_COMPONENT16, size.width(), size.height());
#else
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH_COMPONENT, size.width(), size.height());
#endif
} else {
#ifdef QT_OPENGL_ES
#define GL_DEPTH_COMPONENT16 0x81A5
glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, size.width(), size.height());
#else
glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, size.width(), size.height());
#endif
}
GLint i = 0;
glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT, GL_RENDERBUFFER_DEPTH_SIZE_EXT, &i);
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_stencil_buffer);
fbo_attachment = QGLFramebufferObject::Depth;
valid = checkFramebufferStatus();
if (!valid)
glDeleteRenderbuffers(1, &depth_stencil_buffer);
} else {
fbo_attachment = QGLFramebufferObject::NoAttachment;
}
glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
if (!valid) {
if (color_buffer)
glDeleteRenderbuffers(1, &color_buffer);
else
glDeleteTextures(1, &texture);
glDeleteFramebuffers(1, &fbo);
fbo_guard.setId(0);
}
QT_CHECK_GLERROR();
format.setTextureTarget(target);
format.setSamples(int(samples));
format.setAttachment(fbo_attachment);
format.setInternalTextureFormat(internal_format);
}
void QOpenGLFramebufferObjectPrivate::initAttachments(QOpenGLContext *ctx, QOpenGLFramebufferObject::Attachment attachment)
{
int samples = format.samples();
// free existing attachments
if (depth_buffer_guard) {
funcs.glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, 0);
depth_buffer_guard->free();
}
if (stencil_buffer_guard) {
funcs.glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, 0);
if (stencil_buffer_guard != depth_buffer_guard)
stencil_buffer_guard->free();
}
depth_buffer_guard = 0;
stencil_buffer_guard = 0;
GLuint depth_buffer = 0;
GLuint stencil_buffer = 0;
// In practice, a combined depth-stencil buffer is supported by all desktop platforms, while a
// separate stencil buffer is not. On embedded devices however, a combined depth-stencil buffer
// might not be supported while separate buffers are, according to QTBUG-12861.
if (attachment == QOpenGLFramebufferObject::CombinedDepthStencil
&& funcs.hasOpenGLExtension(QOpenGLExtensions::PackedDepthStencil))
{
// depth and stencil buffer needs another extension
funcs.glGenRenderbuffers(1, &depth_buffer);
funcs.glBindRenderbuffer(GL_RENDERBUFFER, depth_buffer);
Q_ASSERT(funcs.glIsRenderbuffer(depth_buffer));
if (samples != 0 && funcs.hasOpenGLExtension(QOpenGLExtensions::FramebufferMultisample))
funcs.glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples,
GL_DEPTH24_STENCIL8, size.width(), size.height());
else
funcs.glRenderbufferStorage(GL_RENDERBUFFER,
GL_DEPTH24_STENCIL8, size.width(), size.height());
stencil_buffer = depth_buffer;
funcs.glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, depth_buffer);
funcs.glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, stencil_buffer);
valid = checkFramebufferStatus(ctx);
if (!valid) {
funcs.glDeleteRenderbuffers(1, &depth_buffer);
stencil_buffer = depth_buffer = 0;
}
}
if (depth_buffer == 0 && (attachment == QOpenGLFramebufferObject::CombinedDepthStencil
|| (attachment == QOpenGLFramebufferObject::Depth)))
{
funcs.glGenRenderbuffers(1, &depth_buffer);
funcs.glBindRenderbuffer(GL_RENDERBUFFER, depth_buffer);
Q_ASSERT(funcs.glIsRenderbuffer(depth_buffer));
if (samples != 0 && funcs.hasOpenGLExtension(QOpenGLExtensions::FramebufferMultisample)) {
if (ctx->isOpenGLES()) {
if (funcs.hasOpenGLExtension(QOpenGLExtensions::Depth24))
funcs.glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples,
GL_DEPTH_COMPONENT24, size.width(), size.height());
else
funcs.glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples,
GL_DEPTH_COMPONENT16, size.width(), size.height());
} else {
funcs.glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples,
GL_DEPTH_COMPONENT, size.width(), size.height());
}
} else {
if (ctx->isOpenGLES()) {
if (funcs.hasOpenGLExtension(QOpenGLExtensions::Depth24)) {
funcs.glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24,
size.width(), size.height());
} else {
funcs.glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16,
size.width(), size.height());
}
} else {
funcs.glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, size.width(), size.height());
}
}
funcs.glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, depth_buffer);
valid = checkFramebufferStatus(ctx);
if (!valid) {
funcs.glDeleteRenderbuffers(1, &depth_buffer);
depth_buffer = 0;
}
}
if (stencil_buffer == 0 && (attachment == QOpenGLFramebufferObject::CombinedDepthStencil)) {
funcs.glGenRenderbuffers(1, &stencil_buffer);
funcs.glBindRenderbuffer(GL_RENDERBUFFER, stencil_buffer);
Q_ASSERT(funcs.glIsRenderbuffer(stencil_buffer));
#ifdef QT_OPENGL_ES
GLenum storage = GL_STENCIL_INDEX8;
#else
GLenum storage = ctx->isOpenGLES() ? GL_STENCIL_INDEX8 : GL_STENCIL_INDEX;
#endif
if (samples != 0 && funcs.hasOpenGLExtension(QOpenGLExtensions::FramebufferMultisample))
funcs.glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples, storage, size.width(), size.height());
else
funcs.glRenderbufferStorage(GL_RENDERBUFFER, storage, size.width(), size.height());
funcs.glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, stencil_buffer);
valid = checkFramebufferStatus(ctx);
if (!valid) {
funcs.glDeleteRenderbuffers(1, &stencil_buffer);
stencil_buffer = 0;
}
}
// The FBO might have become valid after removing the depth or stencil buffer.
valid = checkFramebufferStatus(ctx);
if (depth_buffer && stencil_buffer) {
fbo_attachment = QOpenGLFramebufferObject::CombinedDepthStencil;
} else if (depth_buffer) {
fbo_attachment = QOpenGLFramebufferObject::Depth;
} else {
fbo_attachment = QOpenGLFramebufferObject::NoAttachment;
}
if (valid) {
if (depth_buffer)
depth_buffer_guard = new QOpenGLSharedResourceGuard(ctx, depth_buffer, freeRenderbufferFunc);
if (stencil_buffer) {
if (stencil_buffer == depth_buffer)
stencil_buffer_guard = depth_buffer_guard;
else
stencil_buffer_guard = new QOpenGLSharedResourceGuard(ctx, stencil_buffer, freeRenderbufferFunc);
}
} else {
if (depth_buffer)
funcs.glDeleteRenderbuffers(1, &depth_buffer);
if (stencil_buffer && depth_buffer != stencil_buffer)
funcs.glDeleteRenderbuffers(1, &stencil_buffer);
}
QT_CHECK_GLERROR();
format.setAttachment(fbo_attachment);
}
void QOpenGLFramebufferObjectPrivate::init(QOpenGLFramebufferObject *, const QSize &sz,
QOpenGLFramebufferObject::Attachment attachment,
GLenum texture_target, GLenum internal_format,
GLint samples, bool mipmap)
{
QOpenGLContext *ctx = QOpenGLContext::currentContext();
funcs.initializeOpenGLFunctions();
if (!funcs.hasOpenGLFeature(QOpenGLFunctions::Framebuffers))
return;
// Fall back to using a normal non-msaa FBO if we don't have support for MSAA
if (!funcs.hasOpenGLExtension(QOpenGLExtensions::FramebufferMultisample)
|| !funcs.hasOpenGLExtension(QOpenGLExtensions::FramebufferBlit)) {
samples = 0;
}
#ifndef QT_OPENGL_ES_2
GLint maxSamples;
funcs.glGetIntegerv(GL_MAX_SAMPLES, &maxSamples);
samples = qBound(0, int(samples), int(maxSamples));
#endif
size = sz;
target = texture_target;
// texture dimensions
QT_RESET_GLERROR(); // reset error state
GLuint fbo = 0;
funcs.glGenFramebuffers(1, &fbo);
funcs.glBindFramebuffer(GL_FRAMEBUFFER, fbo);
GLuint color_buffer = 0;
QT_CHECK_GLERROR();
// init texture
if (samples == 0) {
initTexture(texture_target, internal_format, size, mipmap);
} else {
mipmap = false;
funcs.glGenRenderbuffers(1, &color_buffer);
funcs.glBindRenderbuffer(GL_RENDERBUFFER, color_buffer);
funcs.glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples, internal_format, size.width(), size.height());
funcs.glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, color_buffer);
QT_CHECK_GLERROR();
valid = checkFramebufferStatus(ctx);
if (valid) {
funcs.glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
color_buffer_guard = new QOpenGLSharedResourceGuard(ctx, color_buffer, freeRenderbufferFunc);
}
}
format.setTextureTarget(target);
format.setSamples(int(samples));
format.setInternalTextureFormat(internal_format);
format.setMipmap(mipmap);
initAttachments(ctx, attachment);
funcs.glBindFramebuffer(GL_FRAMEBUFFER, ctx->d_func()->current_fbo);
if (valid) {
fbo_guard = new QOpenGLSharedResourceGuard(ctx, fbo, freeFramebufferFunc);
} else {
if (color_buffer_guard) {
color_buffer_guard->free();
color_buffer_guard = 0;
} else if (texture_guard) {
texture_guard->free();
texture_guard = 0;
}
funcs.glDeleteFramebuffers(1, &fbo);
}
QT_CHECK_GLERROR();
}
void QGLFramebufferObjectPrivate::init(QGLFramebufferObject *q, const QSize &sz,
QGLFramebufferObject::Attachment attachment,
GLenum texture_target, GLenum internal_format, GLint samples)
{
QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext());
fbo_guard.setContext(ctx);
bool ext_detected = (QGLExtensions::glExtensions() & QGLExtensions::FramebufferObject);
if (!ext_detected || (ext_detected && !qt_resolve_framebufferobject_extensions(ctx)))
return;
size = sz;
target = texture_target;
// texture dimensions
QT_RESET_GLERROR(); // reset error state
GLuint fbo = 0;
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo);
fbo_guard.setId(fbo);
glDevice.setFBO(q, attachment);
QT_CHECK_GLERROR();
// init texture
if (samples == 0) {
glGenTextures(1, &texture);
glBindTexture(target, texture);
glTexImage2D(target, 0, internal_format, size.width(), size.height(), 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
#ifndef QT_OPENGL_ES
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
#else
glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
#endif
glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
target, texture, 0);
QT_CHECK_GLERROR();
valid = checkFramebufferStatus();
glBindTexture(target, 0);
color_buffer = 0;
} else {
GLint maxSamples;
glGetIntegerv(GL_MAX_SAMPLES_EXT, &maxSamples);
samples = qBound(0, int(samples), int(maxSamples));
glGenRenderbuffers(1, &color_buffer);
glBindRenderbuffer(GL_RENDERBUFFER_EXT, color_buffer);
if (glRenderbufferStorageMultisampleEXT && samples > 0) {
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
internal_format, size.width(), size.height());
} else {
samples = 0;
glRenderbufferStorage(GL_RENDERBUFFER_EXT, internal_format,
size.width(), size.height());
}
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_RENDERBUFFER_EXT, color_buffer);
QT_CHECK_GLERROR();
valid = checkFramebufferStatus();
if (valid)
glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT, GL_RENDERBUFFER_SAMPLES_EXT, &samples);
}
// In practice, a combined depth-stencil buffer is supported by all desktop platforms, while a
// separate stencil buffer is not. On embedded devices however, a combined depth-stencil buffer
// might not be supported while separate buffers are, according to QTBUG-12861.
if (attachment == QGLFramebufferObject::CombinedDepthStencil
&& (QGLExtensions::glExtensions() & QGLExtensions::PackedDepthStencil)) {
// depth and stencil buffer needs another extension
glGenRenderbuffers(1, &depth_buffer);
Q_ASSERT(!glIsRenderbuffer(depth_buffer));
glBindRenderbuffer(GL_RENDERBUFFER_EXT, depth_buffer);
Q_ASSERT(glIsRenderbuffer(depth_buffer));
if (samples != 0 && glRenderbufferStorageMultisampleEXT)
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH24_STENCIL8_EXT, size.width(), size.height());
else
glRenderbufferStorage(GL_RENDERBUFFER_EXT,
GL_DEPTH24_STENCIL8_EXT, size.width(), size.height());
stencil_buffer = depth_buffer;
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_buffer);
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, stencil_buffer);
valid = checkFramebufferStatus();
if (!valid) {
glDeleteRenderbuffers(1, &depth_buffer);
stencil_buffer = depth_buffer = 0;
}
}
if (depth_buffer == 0 && (attachment == QGLFramebufferObject::CombinedDepthStencil
|| (attachment == QGLFramebufferObject::Depth)))
{
glGenRenderbuffers(1, &depth_buffer);
Q_ASSERT(!glIsRenderbuffer(depth_buffer));
glBindRenderbuffer(GL_RENDERBUFFER_EXT, depth_buffer);
Q_ASSERT(glIsRenderbuffer(depth_buffer));
if (samples != 0 && glRenderbufferStorageMultisampleEXT) {
#ifdef QT_OPENGL_ES
if (QGLExtensions::glExtensions() & QGLExtensions::Depth24) {
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH_COMPONENT24_OES, size.width(), size.height());
} else {
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH_COMPONENT16, size.width(), size.height());
}
#else
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH_COMPONENT, size.width(), size.height());
#endif
} else {
#ifdef QT_OPENGL_ES
if (QGLExtensions::glExtensions() & QGLExtensions::Depth24) {
glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24_OES,
size.width(), size.height());
} else {
glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16,
size.width(), size.height());
}
#else
glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, size.width(), size.height());
#endif
}
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_buffer);
valid = checkFramebufferStatus();
if (!valid) {
glDeleteRenderbuffers(1, &depth_buffer);
depth_buffer = 0;
}
}
if (stencil_buffer == 0 && (attachment == QGLFramebufferObject::CombinedDepthStencil)) {
glGenRenderbuffers(1, &stencil_buffer);
Q_ASSERT(!glIsRenderbuffer(stencil_buffer));
glBindRenderbuffer(GL_RENDERBUFFER_EXT, stencil_buffer);
Q_ASSERT(glIsRenderbuffer(stencil_buffer));
if (samples != 0 && glRenderbufferStorageMultisampleEXT) {
#ifdef QT_OPENGL_ES
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_STENCIL_INDEX8_EXT, size.width(), size.height());
#else
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_STENCIL_INDEX, size.width(), size.height());
#endif
} else {
#ifdef QT_OPENGL_ES
glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX8_EXT,
size.width(), size.height());
#else
glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX,
size.width(), size.height());
#endif
}
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, stencil_buffer);
valid = checkFramebufferStatus();
if (!valid) {
glDeleteRenderbuffers(1, &stencil_buffer);
stencil_buffer = 0;
}
}
// The FBO might have become valid after removing the depth or stencil buffer.
valid = checkFramebufferStatus();
if (depth_buffer && stencil_buffer) {
fbo_attachment = QGLFramebufferObject::CombinedDepthStencil;
} else if (depth_buffer) {
fbo_attachment = QGLFramebufferObject::Depth;
} else {
fbo_attachment = QGLFramebufferObject::NoAttachment;
}
glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
if (!valid) {
if (color_buffer)
glDeleteRenderbuffers(1, &color_buffer);
else
glDeleteTextures(1, &texture);
if (depth_buffer)
glDeleteRenderbuffers(1, &depth_buffer);
if (stencil_buffer && depth_buffer != stencil_buffer)
glDeleteRenderbuffers(1, &stencil_buffer);
glDeleteFramebuffers(1, &fbo);
fbo_guard.setId(0);
}
QT_CHECK_GLERROR();
format.setTextureTarget(target);
format.setSamples(int(samples));
format.setAttachment(fbo_attachment);
format.setInternalTextureFormat(internal_format);
}
