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GLSL matrices are stored in column-major order while GL_ARB_vertex/fragment_program
use row-major. So, need to use STATE_MATRIX_TRANSPOSE for built-in matrices.
Unfortunately, this means that the expression M * V isn't very efficient since we
need to extract the rows out of M. And that's the typical expression for vertex
transformation: gl_ModelViewProjectionMatrix * gl_Position.
Solve this inefficiency by looking for M*V expressions and replacing them
with V*Transpose(M).
Also, add support for GLSL 1.20's MatrixTranspose, Inverse and InverseTranspose
matrices.
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Replace CurFunction with curFuncEndLabel.
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These control code generation options. May be overridden by drivers, debuggers, etc.
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functions.
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Note that GL_ARB_v_p and GL_NV_v_p define the z component of the EXP instruction
differently. We follow the ARB extension.
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