bgfx/3rdparty/glsl-optimizer/Changelog.md

GLSL optimizer Change Log

2014 10

Goodies:

• Support for translating GLSL shaders into Apple Metal shading language. Exactly same process; GLSL in (preferably ES3 variant), optimization passes, Metal out. All uniforms currently will be put into one constant buffer. Pass kGlslTargetMetal target to get Metal.
• Shader reflection API. See glslopt_shader_get_* functions. Binding indices are only automatically assigned on Metal now; on GL/ES targets the reflection API is only useful to get list of inputs/uniforms, their names and types.
• Improved dead code elimation: some cases of swizzled/masked assignments where same variable was on both sides were not eliminated if that variable was totally unused later.
• Merged with upstream Mesa, comes with new optimizations (min/max pruning, tree rebalancing, vector_insert lowering).

Fixes:

• sampler3D declarations were missing precision qualifier on GLES3.0.

2014 09

Goodies:

• Supports GL_EXT_draw_buffers in ES2.0, for MRT.

2014 08

Goodies:

• Supports GL_EXT_shader_framebuffer_fetch now, in both ES2.0 & 3.0.

Fixes:

• Fixed printing of infinities & NaNs.
• Fixed vectorization pass in some cases going wrong on texture lookups.

2014 06

Goodies:

• Optimization: split vectors with only some used components into scalars.

Fixes:

• Fixed more issues with for-loop printing.
• Fixed printing of unsigned integer swizzled & constants.

2014 03

Fixes:

• Fixed missing precision qualifier in some ES shaders (mostly due to expansion of ternary ?: check).

2014 02

Fixes:

• Fixed vectorize pass introduced last month going wrong with dot products.

2014 01

Goodies:

• Better optimization: vectorize assignments to individual vector channels.
• More OpenGL ES 2.0 conformant printing of complex for-loops (loop inductions printed as += or ++; loop initializers inside loop body).

Fixes:

• Fixed array assignments sometimes appearing in pre-GLSL1.20 versions, especially with complex loops that couldn't be unrolled.
• Fixed output of textureOffset and texelFetch.
• Fixed error messages on MRT outputs on GL & GLES3 (now supports 4 MRTs).

2013 12

Goodies:

• Optimized performance; was spending half of the time in stupid string code.
• Added glslopt_shader_get_stats to get very approximate shader complexity stats.
• Nicer printing of complicated for-loops.

Fixes:

• Fixed printing of struct initializers.

2013 11

Goodies:

• Better optimizations: CSE; A+(-B) => A-B; !A || !B => !(A && B).
• Merged with upstream Mesa.

Fixes:

• Fixed location qualifiers, ES3.0 version printing, samplerCubeShadow sampling operations.

2013 10

Goodies:

• Initial OpenGL ES 3.0 support
• API to query shader input names; glslopt_shader_get_input_count and glslopt_shader_get_input_name

Changes:

• Xcode project files updated to Xcode 5

Fixes:

• VS2013 fixes