This is a series about the SDL2-Renderer
1 - sets up a Renderer and renders a png
1a, 1b, 1c using SDL_RenderCopyEx
1d how to take a screenshot
2 - uses SDL_RenderDrawPoint to render a gradient.
3 - resizes the gradient to the window dimensions
4 - animates the gradient like a new shadertoy gradient.
Shows a bit how glsl works and why we want shaders.
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