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The association of a VBO to an array is to be saved in the client state: we should look up the VBO only when we draw some geometry. The error was discovered running the cube_tex example (it will be added to the repo in a later commit), which uses two different VBOs for the position and texture coordinate attributes.
This example uses SDL2 and glm. At the moment this example does not work on the Wii/GameCube, as the textured rendering using OpenGL 2.0 will come in a later commit. The "common" directory contains textures that get embedded into the executable, so that examples can be written without access to external files (which makes testing on the console -- or on the emulator -- very straightforward).
Colors are often specifies as a 3 or 4 long vector of floats, but GX does not support specifying colors using floating point components. Therefore, convert such values to GXColor.
The data here is just an integer number representing the texture unit bound to the uniform.
This is all what is needed to let the client developer write a GX shader capable of supporting textured geometries.
This is a bit primitive, because we are hardcoding the texture stage and other TEV variables (we'll improve this later), but it does the job.
To make clear that these functions are to be called only when implementing shaders in the client code, rename them to have a "ogx_shader" prefix. Also use the "_gx" or "_gl" suffix to indicate whether they expect the matrix to be in the GX or OpenGL format.
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Support for using textures in OpenGL 2.0 shader implementations.
Built on top of #99, it must be merged after that.