graphics: Implement MSAA render textures #478
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Gleaned implementation idea directly from sokol. For now only for OpenGL.
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Gleaned the idea from sokol:
With
sample_count > 1, render buffer object will be created instead of a regulat texture, allowing us to have anti-aliased render targets on GLES3.For those textures, at the
end_render_pass, render buffer will be blit into aresolvetexture.A new example, examples/msaa_render_texture.rs, illustrates the idea.