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This branch introduces new FRAG_ATTRIB_FACE and FRAG_ATTRIB_PNTC fragment
program inputs for GLSL gl_FrontFacing and gl_PointCoord. Before, these
attributes were packed with the FOG attribute. That made things
complicated elsewhere.
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This is a more logical place for this code.
Also add some functions for querying vertex shader input names, types, etc.
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The two indexes were mixed up when accessing a row of a matrix in an array
of matrices.
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gl_NormalMatrix is the inverse transpose of the modelview matrix, but
as every matrix here needs to be transposed, we end up with
{MODELVIEW_MATRIX, INVERSE}.
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This fixes broken variable indexing into the gl_Eye/ObjectPlaneS/T/R/Q arrays.
See bug 20986.
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This allows code such as "vec4 a = gl_LightSource[i].ambient;" to work.
When a built-in uniform array is indexed with a variable index we need to
"unroll" the whole array into the parameter list (aka constant buffer) because
we don't know which elements may be accessed at compile-time. In the case of
the gl_LightSource array of size [8], we emit 64 state references into the
parameter array (8 elements times 8 vec4s per gl_LightSourceParameters
struct).
Previously, we only allowed constant-indexed references to uniform arrays
(such as gl_LightSource[2].position) which resulted in a single state reference
being added to the parameter array, not 64. We still optimize this case.
Users should be aware that using "gl_LightSource[i].ambient" in their shaders
is a bit expensive since state validation will involve updating all 64
light source entries in the parameter list.
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Was broken by commit 9aca9a4b72b2a7b378e50bd88f9c3324d07375ec.
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Build on the heirarchal approach implemented for arrays/structs.
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The slang_ir_storage type now has a pointer to parent storage to represent
storage of an array element within an array, or a field within a struct.
This fixes some problems related to addressing of fields/elements in non-
trivial cases. More work to follow.
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variable array indexes.
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of -I flags.
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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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After several tries at making a table-based system for examining pre-defined
uniforms to find statevar indexes, give up and do it the simple way (lots of
strcmp() calls). Not terribly elegant, but perfectly functional.
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