Basic Vertex Shader
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Scan day: 07 February 2014 UTC
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Description: A clean example of a no-frills vertex shader. demonstrates input/output semantics, application variables and state values.
i get garbage at the end of my buffer somehow.... by godecho !!ARBvp1.0 #************************************************** # www.UltimateGameProgramming.com # Basic Vertex Shader in OpenGL (ARBvp1.0) # Created by the Programming Ace #************************************************** # Original Input... ATTRIB OriginalPos = vertex.position; ATTRIB OriginalColor = vertex.color; # Vertex Output... OUTPUT OutPos = result.position; OUTPUT OutColor = result.color; # Constant variables... PARAM ModelViewProj[4] = { state.matrix.mvp }; # Modelview Projection Matrix. PARAM InputTranslation = program.env[0]; # Translation value sent in from the application. TEMP temp; # Just a temporary variable. #************************************************** # BODY #************************************************** # Here each axis is transformed into clip space. Basically we are storing the correct position # that the vertex would normally be in. Since this is a shader OpenGL cant do this for us. # So don't be scared, this is just positioning the vertex without any translation or rotation. DP4 temp.x, ModelViewProj[0], OriginalPos; DP4 temp.y, ModelViewProj[1], OriginalPos; DP4 temp.z, ModelViewProj[2], OriginalPos; DP4 temp.w, ModelViewProj[3], OriginalPos; # Now here we will add the translation to the position before setting it to the output. # I figured we could just use the ADD instruction to just add the x, y, z positions # and get an accurate look. ADD temp, temp, InputTranslation; # Set the final Output position. MOV OutPos, temp; # We will use the some color that the vertex come in with. MOV OutColor, OriginalColor; END
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