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Visualizing NVIDIA gl_ThreadInWarpNV, gl_WarpIDNV and gl_SMIDNV

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This demo shows how a NVIDIA GPU draws a quad by visualizing some GLSL built-in variables: gl_ThreadInWarpNV, gl_WarpIDNV and gl_SMIDNV (GL_NV_shader_thread_group support is required).

The article also discusses about SMs, WARPS, threads and how the number of GPU cores can be computed.
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