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gl_engine: fix always-true clear flag

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The clear flag specified in Canvas::draw is ignored when set to false,
since GlRenderer::mClearBuffer is never explicitly reset to false.

This commit ensures that mClearBuffer is reset to its default (false)
after being used, so that the clear operation behaves correctly per frame.

- Issue: #1779
This commit is contained in:
Sungun No 2025-06-06 20:40:57 +09:00
parent 0fa5d41c8d
commit a3a8a999b7
4 changed files with 21 additions and 19 deletions
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9
src/renderer/gl_engine/tvgGlRenderTask.cpp
View file

@ -195,23 +195,20 @@ void GlComposeTask::run()
{ {
GL_CHECK(glBindFramebuffer(GL_FRAMEBUFFER, getSelfFbo())); GL_CHECK(glBindFramebuffer(GL_FRAMEBUFFER, getSelfFbo()));
// clear this fbo
if (mClearBuffer) {
// we must clear all area of fbo // we must clear all area of fbo
GL_CHECK(glViewport(0, 0, mFbo->getWidth(), mFbo->getHeight())); GL_CHECK(glViewport(0, 0, mFbo->getWidth(), mFbo->getHeight()));
GL_CHECK(glScissor(0, 0, mFbo->getWidth(), mFbo->getHeight())); GL_CHECK(glScissor(0, 0, mFbo->getWidth(), mFbo->getHeight()));
GL_CHECK(glClearColor(0, 0, 0, 0)); GL_CHECK(glClearColor(0, 0, 0, 0));
GL_CHECK(glClearStencil(0)); GL_CHECK(glClearStencil(0));
#ifdef THORVG_GL_TARGET_GLES #ifdef THORVG_GL_TARGET_GLES
GL_CHECK(glClearDepthf(0.0)); GL_CHECK(glClearDepthf(0.0));
#else #else
GL_CHECK(glClearDepth(0.0)); GL_CHECK(glClearDepth(0.0));
#endif #endif
GL_CHECK(glDepthMask(1)); GL_CHECK(glDepthMask(1));
GL_CHECK(glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)); GL_CHECK(glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT));
GL_CHECK(glDepthMask(0)); GL_CHECK(glDepthMask(0));
}
GL_CHECK(glViewport(0, 0, mRenderWidth, mRenderHeight)); GL_CHECK(glViewport(0, 0, mRenderWidth, mRenderHeight));
GL_CHECK(glScissor(0, 0, mRenderWidth, mRenderHeight)); GL_CHECK(glScissor(0, 0, mRenderWidth, mRenderHeight));

4
src/renderer/gl_engine/tvgGlRenderTask.h
View file

@ -125,8 +125,8 @@ public:
void run() override; void run() override;
void setRenderSize(uint32_t width, uint32_t height) { mRenderWidth = width; mRenderHeight = height; } void setRenderSize(uint32_t width, uint32_t height) { mRenderWidth = width; mRenderHeight = height; }
void setClearBuffer(bool clearBuffer) { mClearBuffer = clearBuffer; }
bool mClearBuffer = true;
protected: protected:
GLuint getTargetFbo() { return mTargetFbo; } GLuint getTargetFbo() { return mTargetFbo; }
@ -134,6 +134,8 @@ protected:
GLuint getResolveFboId(); GLuint getResolveFboId();
void onResolve(); void onResolve();
bool mClearBuffer = false;
private: private:
GLuint mTargetFbo; GLuint mTargetFbo;
GlRenderTarget* mFbo; GlRenderTarget* mFbo;

5
src/renderer/gl_engine/tvgGlRenderer.cpp
View file

@ -839,7 +839,7 @@ bool GlRenderer::sync()
prepareBlitTask(task); prepareBlitTask(task);
task->mClearBuffer = mClearBuffer; task->setClearBuffer(mClearBuffer);
task->setTargetViewport({{0, 0}, {int32_t(surface.w), int32_t(surface.h)}}); task->setTargetViewport({{0, 0}, {int32_t(surface.w), int32_t(surface.h)}});
if (mGpuBuffer.flushToGPU()) { if (mGpuBuffer.flushToGPU()) {
@ -853,6 +853,9 @@ bool GlRenderer::sync()
clearDisposes(); clearDisposes();
// Reset clear buffer flag to default (false) after use.
mClearBuffer = false;
delete task; delete task;
return true; return true;

2
src/renderer/gl_engine/tvgGlRenderer.h
View file

@ -153,7 +153,7 @@ private:
} mDisposed; } mDisposed;
BlendMethod mBlendMethod = BlendMethod::Normal; BlendMethod mBlendMethod = BlendMethod::Normal;
bool mClearBuffer = true; //FIXME: clear buffer should be optional (default is false) bool mClearBuffer = false;
}; };
#endif /* _TVG_GL_RENDERER_H_ */ #endif /* _TVG_GL_RENDERER_H_ */