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+First we start with a vertex shader.
+There are a couple of intermediary processes that have to go into this, but this is good for our puposes.
+Then we do Vertex Post-Processing.
+Then we do primitive assembly.
+    Face culling (every face away will be removed).
+Rasterization: convert primitives to fragments: not quite pixels, the values are interpolated
+Fragment shader: Is where we can output color. Lighting, shadows.
+Per-sample operations: series of thests to see if the fragment should be drawn.
+    Most important test is the depth test for shadows.
+
+
+The most important shaders: Vertex and Fragment.
+
+
+Origin of shaders. Shader programs are a group of shaders (Vertex, Tessellation, Geometry, Fragment...) associated with one another.
+They are created in OpenGL with functions.
+
+
+
+Creating a Shader program
+1. Create an empty program
+    - glUseProgram(shader_id)
+    -
+2. Create empty shaders
+3. Attach shader source code to shaders.
+4. Compile shaders.
+5. Attach shaders to program.
+6. Link program (creates executables from shaders and links them together).
+7. Validate program (because things run on the GPU it's harder to debug).
+