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thanks to memononen for the suggestion to use NVG_IMAGE_NODELETE
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demos/nanovg/main.c
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demos/nanovg/main.c
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/* Create a GPU_Image from a NanoVG Framebuffer */
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GPU_Image* generateFBO(NVGcontext* _vg, const float _w, const float _h, void (*draw)(NVGcontext*, const float, const float, const float, const float)) {
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// GPU_FlushBlitBuffer(); // you may want to call this if you're doing this in the middle of SDL_gpu blitting
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NVGLUframebuffer* fb = nvgluCreateFramebuffer(_vg, _w, _h, 0); // IMPORTANT: don't run nvgluDeleteFramebuffer
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// GPU_FlushBlitBuffer(); // call GPU_FlushBlitBuffer if you're doing this in the middle of SDL_gpu blitting
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NVGLUframebuffer* fb = nvgluCreateFramebuffer(_vg, _w, _h, NVG_IMAGE_NODELETE); // IMPORTANT: don't run nvgluDeleteFramebuffer
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nvgluBindFramebuffer(fb);
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glViewport(0, 0, _w, _h);
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glClearColor(0, 0, 0, 0);
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/* nvgluBindFramebuffer(0); // official documentation says to unbind, but I haven't had issues not doing it */
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GPU_ResetRendererState(); // not calling GPU_ResetRendererState can cause problems with SDL_gpu depending on your order of operations
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// IMPORTANT: don't run nvgluDeleteFramebuffer, GPU_CreateImageUsingTexture takes the handle
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return GPU_CreateImageUsingTexture(fb->texture, false); // should take_ownership be true?
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GPU_Image* return_image = GPU_CreateImageUsingTexture(fb->texture, false); // should take_ownership be true?
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nvgluDeleteFramebuffer(fb);
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return return_image;
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}
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/* Simple Drawing Example */
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/* SDL_gpu + NanoVG Rendering */
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GPU_ClearRGBA(_screen, 0x00, 0x00, 0x00, 0xFF); // GPU_ClearRGBA clears GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT
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glClear(GL_STENCIL_BUFFER_BIT); // IMPORTANT: GPU_ClearRGBA does not clear GL_STENCIL_BUFFER_BIT
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/* SDL_gpu Blitting */
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GPU_BlitRectX(fbo_complex, NULL, _screen, &fbo_complex_rect, 0.0f, 0.0f, 0.0f, GPU_FLIP_VERTICAL); // IMPORTANT: GPU_BlitRectX is required to use GPU_FLIP_VERTICAL which is required for NVGLUframebuffer data (why???)
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GPU_BlitRectX(fbo_simple, NULL, _screen, &fbo_simple_rect, 0.0f, 0.0f, 0.0f, GPU_FLIP_VERTICAL); // IMPORTANT: GPU_BlitRectX is required to use GPU_FLIP_VERTICAL which is required for NVGLUframebuffer data (why???)
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/* NanoVG Section */
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GPU_FlushBlitBuffer(); // IMPORTANT: run GPU_FlushBlitBuffer before nvgBeginFrame
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nvgBeginFrame(_vg, _screen_w, _screen_h, px_ratio); // Do your normal NanoVG stuff
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/* drawComplexNVG(_vg); */
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nvgEndFrame(_vg); // Finish our NanoVG pass
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GPU_ResetRendererState(); // IMPORTANT: run GPU_ResetRendererState after nvgEndFrame
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/* Finish */
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GPU_Flip(_screen); // Render to screen
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} while (loop);