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This eliminates the NOP instructions that had been used as placeholders for
branch targets.
Also, fix "return" statement bug.
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Also, start moving high vs. low-level instruction selection into slang_emit.c
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Clean-up ARB_shaderobjects code a bit.
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- add support for varyings;
GLSL fixes:
- pow was wrongly computed in x86 back-end;
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- add texture sampling support;
- fix assembly codegen bugs;
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- add x86 code generator;
- add full support for uniforms in ARB_shader_objects;
- add assembly instruction: global_addr;
- reorganize #includes;
- built-in uniforms accessed by index, rather than by name;
- add some entries to x86sse rtasm;
- add configurations to VC6 projects: 'Release x86' and 'Debug x86';
- #define SLANG_X86 active only on VC6 x86 builds;
- introduce code export table for a shader;
- remove GNU license from the noise library;
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- uniforms (only GetLocation, Uniform1f and Uniform4fv for now for demos);
- fix bugs and optimize array size handling;
- 2D texture sampling (needs Enable(TEXTURE_2D) to work);
- decrease built-in library assembly size by 30%.
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