4aiman/obs-studio
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4 commits

Author SHA1 Message Date
jp9000
a6dbe1501d Fix precision issues with new conversion shader 
Turns out that on some adapters, due to some sort of internal GPU
precision error, fmod(x, y) can return x when x == y, wich is incorrect
(and no, they were actually equal, not off due to precision errors).

This would cause the shader to sample wrong coordinates on the edges
sometimes.  Just adding 0.1 to the x value before being put in to fmod
and then flooring the result after fixes the issue.
 2014-02-17 09:28:27 -07:00
jp9000
105aafbc96 Fix a NULL pointer deference 
Also, fixed an issue with the new conversion shader not compiling
properly on some video devices
 2014-02-16 22:42:35 -07:00
jp9000
f5fc9e7da8 Remove redundant constant from conversion shader 2014-02-16 19:55:59 -07:00
jp9000
2dbbffe4a2 Make a number of key optimizations 
- Changed glMapBuffer to glMapBufferRange to allow invalidation.  Using
   just glMapBuffer alone was causing some unacceptable stalls.

 - Changed dynamic buffers from GL_DYNAMIC_WRITE to GL_STREAM_WRITE
   because I had misunderstood the OpenGL specification

 - Added _OPENGL and _D3D11 builtin preprocessor macros to effects to
   allow special processing if needed

 - Added fmod support to shaders (NOTE: D3D and GL do not function
   identically with negative numbers when using this.  Positive numbers
   however function identically)

 - Created a planar conversion shader that converts from packed YUV to
   planar 420 right on the GPU without any CPU processing.  Reduces
   required GPU download size to approximately 37.5% of its normal rate
   as well.  GPU usage down by 10 entire percentage points despite the
   extra required pass.
 2014-02-16 19:28:21 -07:00