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[Fix] (MG_Backend/DirectGLES): re-implement FBO sync, attachment remapping

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swung0x48
2026-02-04 14:42:48 +08:00
parent f4ce17af51
commit 1b47f1bb92
3 changed files with 114 additions and 105 deletions
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MobileGL/MG_Backend/DirectGLES/Managers.cpp
+51 -16
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@@ -850,24 +850,47 @@ namespace MobileGL::MG_Backend::DirectGLES {
GLenum glFBOTarget = MG_Util::ConvertFramebufferTargetToGLEnum(asTarget);
Bind(asTarget);
// connect attachments (set buffers)
// TODO: remapping
// -------------------- Connect attachments (set buffers) -----------------------
// 1. Remap draw buffers
auto& stateDrawBuffers = stateFBOObject->GetDrawBuffers();
Bool drawBufferDirty = false;
for (GLint i = 0; i < MG_State::GLState::FramebufferObject::MAX_DRAW_BUFFERS; ++i) {
auto currentBuf = MG_Util::ConvertFramebufferAttachmentTypeToGLEnum(stateDrawBuffers[i]);
if (m_backendDrawBuffers[i] != currentBuf)
drawBufferDirty = true;
m_backendDrawBuffers[i] = currentBuf;
Bool drawBufferClean = false;
if (memcmp(m_frontendDrawBuffers, stateDrawBuffers.data(),
FramebufferObject::MAX_DRAW_BUFFERS * sizeof(FramebufferAttachmentType)) == 0) {
drawBufferClean = true;
}
if (drawBufferDirty)
MG_External::GLES::glDrawBuffers(MG_State::GLState::FramebufferObject::MAX_DRAW_BUFFERS, m_backendDrawBuffers);
auto currentReadBuf = MG_Util::ConvertFramebufferAttachmentTypeToGLEnum(stateFBOObject->GetReadBuffer());
if (m_backendReadBuffer != currentReadBuf)
MG_External::GLES::glReadBuffer(m_backendReadBuffer);
if (!drawBufferClean) {
memcpy(m_frontendDrawBuffers, stateDrawBuffers.data(),
FramebufferObject::MAX_DRAW_BUFFERS * sizeof(FramebufferAttachmentType));
std::fill(m_backendDrawBuffers, m_backendDrawBuffers + FramebufferObject::MAX_DRAW_BUFFERS, GL_NONE);
int nEffectiveBuffers = 0;
for (GLint i = 0; i < FramebufferObject::MAX_DRAW_BUFFERS; ++i) {
if (stateDrawBuffers[i] == FramebufferAttachmentType::None) {
m_backendDrawBuffers[i] = GL_NONE;
continue;
}
// attach texture to fbo
// Create compacted mapping
m_backendDrawBuffers[i] = GL_COLOR_ATTACHMENT0 + i;
nEffectiveBuffers = i + 1;
}
MG_External::GLES::glDrawBuffers(nEffectiveBuffers, m_backendDrawBuffers);
}
// 2. Remap read buffer
auto frontendReadBuf = stateFBOObject->GetReadBuffer();
if (frontendReadBuf != m_frontendReadBuffer) {
m_frontendReadBuffer = frontendReadBuf;
GLenum glBackendReadBuffer = GetBackendAttachmentType(frontendReadBuf);
if (m_backendReadBuffer != glBackendReadBuffer) {
m_backendReadBuffer = glBackendReadBuffer;
MG_External::GLES::glReadBuffer(glBackendReadBuffer);
}
}
// -------------------- Attach texture to backend FBO -----------------------
// TODO: attach according to remapped
const auto& attachments = stateFBOObject->GetAllAttachmentObjects();
const auto& attachmentVersions = stateFBOObject->GetAllFramebufferAttachmentVersions();
@@ -885,8 +908,20 @@ namespace MobileGL::MG_Backend::DirectGLES {
}
}
FramebufferAttachmentType BackendFramebufferObject::GetCompactedAttachmentTypeAtDrawBufferIndex(Int index) {
return m_compactedFrontendDrawBuffers[index];
GLenum BackendFramebufferObject::GetBackendAttachmentType(FramebufferAttachmentType frontendAtt) const {
GLenum glBackendReadBuffer = GL_NONE;
auto it = std::find(m_frontendDrawBuffers,
m_frontendDrawBuffers + FramebufferObject::MAX_DRAW_BUFFERS, frontendAtt);
Bool notFound = (it == m_frontendDrawBuffers + FramebufferObject::MAX_DRAW_BUFFERS);
if (notFound) {
MGLOG_D("%s: frontendAtt not found in draw buffer (probably not remapped), just use the same as frontend", __func__);
glBackendReadBuffer = MG_Util::ConvertFramebufferAttachmentTypeToGLEnum(frontendAtt);
} else {
MGLOG_D("%s: frontendAtt found in draw buffer, keep it consistent as in read buffers", __func__);
auto index = std::distance(m_frontendDrawBuffers, it);
glBackendReadBuffer = m_backendDrawBuffers[index];
}
return glBackendReadBuffer;
}
UnorderedMap<SharedPtr<MG_State::GLState::FramebufferObject>, SharedPtr<BackendFramebufferObject>>