It should also be noted that using the OpenGL paint engine isn't a silver bullet which makes everything faster. QPainter supports setting an arbitrary clip, including complex QPainterPaths. Engine Operation Primitive Rendering Simple Primitives : To render convex primitives such as rounded rectangles, we just generate a GL triangle fan and render it using glDrawArrays Text : For large text, we convert it to a complex path and render is as such. We then multiply the fragment colour by a sample taken from this mask. So QGLWidget might be a great way to get the best of both worlds when combined with the raster graphicssystem - Use QGLWidget for operations which GL excels at and the raster engine for everything else. Perhaps the most common error in measuring the performance of an OpenGL program is to say something like:. This only allows a single, untransformed rectangle to be used as the clip, which can be quite restrictive. If you measure the time it takes to draw triangles with a glFinish in front and behindyou'll probably be happy to discover that it doesn't take twice as long to draw of them. This is because the GPU will need to sample the texture at multiple locations and run an algorithm on the many texels it reads and then return the final result to your shader.
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Unified cross-platform 3D graphics benchmark database. macOS. GFXBench OpenGL · GFXBench Metal.
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Windows. GFXBench Windows. Choose. GpuTest is a cross-platform (Windows, Linux and Max OS X) GPU stress test and OpenGL benchmark.
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GpuTest comes with several GPU tests including some.
This is done by the QTriangulatingStroker. All the complexity lives in the shaders you give to the GPU to run.
So now the stencil buffer contains the silhouette of our path. Any computer owner can evaluate their individual system.
As a general rule of thumb, OpenGL state changes are expensive. However, instead of filling pixel colours into a colour buffer, we fill stencil values into the stencil buffer.
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3D ExerciZer is an OpenGL application for use on PCs running Windows 95. made on the engine similar to N-Bench, that will test your video sub-system's. Linux Direct3D/OpenGL Performance Data the cases when running Wine at the sub-4K resolutions, the Wine performance is abnormally high.
So, use the knowledge you now have of what's going on under QPainter and try to minimise the number of OpenGL state changes the paint engine needs to do.
A great example of this is drawRect. If it does then you are at least partially fill rate limited - if it doesn't then that's not the problem. Qt uses the GL stencil buffer or more specifically the lower 7 bits of the stencil buffer to store the clip.
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If you measure the time it takes to draw triangles with a glFinish in front and behindyou'll probably be happy to discover that it doesn't take twice as long to draw of them. As already mentioned, the colour of a pixel is determined by the fragment shader.
However, we also need to support text rendering with arbitrary fills QPainter lets you fill text with a perspective transformed radial gradient.
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|When looking at the existing engine, there was a major problem — although it supported fragment programs, it was heavily reliant on fixed-function vertex processing.
Rendering Using Stencil Technique Take the following path as an example: Here we have a seemingly trivial path with only 4 points. Most of the time, this means that the FPS is 3x as high. Not only do we have different types of fill, but we also support a full 3x3 transformation matrix on the brushes.
Deprecated functionality is often a lot slower than core functionality. Leave a Reply Cancel reply Your email address will not be published. Text Pixmaps Strokes Complex vector paths QPainterPath In addition to this, we have various fills which we can use on our primitives provided by QBrush : Solid colour Linear gradients Radial gradients Conical gradients Bitmap patterns Textures Not only do we have different types of fill, but we also support a full 3x3 transformation matrix on the brushes.
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