Commit Graph

9 Commits

Author SHA1 Message Date
Sergey Sharybin
cf8cddf07a Film response curves implemented as a looks
This commit implement's OCIO's Looks idea which
is about applying some color correction on the
buffer before it get's affected by a display
transform.

This is mainly used to modify images in an
artistics way.

Currently we've got looks generated from film
response curves for all sorts of cameras.

Patch by both of me and Brecht.
2013-09-09 09:48:26 +00:00
Sergey Sharybin
f00349293f Code cleanup: us commented out arg names rather than leaving them if unused 2013-09-07 19:41:46 +00:00
Brecht Van Lommel
60ff60dcdc RenderEngine API: add viewport draw utility functions to bind a GLSL fragment
shader for converting colors from linear to display space, based on the scene
color management settings.

if engine.support_display_space_shader(scene): # test graphics card support
	engine.bind_display_space_shader(scene)
	# draw pixels ..
	engine.unbind_display_space_shader()
2013-08-30 23:49:35 +00:00
Sergey Sharybin
9c49e71216 Bunch of fixes for GLSL display transform
- GLSL shader wasn't aware of alpha predivide option,
  always assuming alpha is straight. Gave wrong results
  when displaying transparent float buffers.

- GLSL display wasn't aware of float buffers with number
  of channels different from 4, crashing when trying to
  display image with different number of channels.

  This required a bit larger changes, namely now it's
  possible to pass format (GL_RGB, GL_RGBAm GL_LUMINANCE)
  to glaDrawPixelsTex, This also implied adding format to
  glaDrawPixelsAuto and modifying all places where this
  functions are called.

  Now GLSL will handle both 3 and 4 channels buffers,
  single channel images are handled by CPU.

- Replaced hack for render result displaying with a bit
  different hack.

  Namely CPU conversion will happen only during render,
  once render is done GLSL would be used for displaying
  render result on a screen.

  This is so because of the way renderer updates parts
  of the image -- it happens without respect to active
  render layer in image user. This is harmless because
  only display buffer is modifying, but this is tricky
  because we don't have original buffer opened during
  rendering.

  One more related fix here was about when rendering
  multiple layers, wrong image would be displaying when
  rendering is done. Added a signal to invalidate
  display buffer once rendering is done (only happens
  when using multiple layers). This solves issue with
  wrong buffer stuck on the display when using regular
  CPU display space transform and if GLSL is available
  it'll make image displayed with a GLSL shader.

- As an additional change, byte buffers now also uses
  GLSL display transform.

  So now only dutehr and RGB curves are stoppers for
  using GLSL for all kind of display transforms.
2013-04-03 15:59:54 +00:00
Sergey Sharybin
f871d9a82f Fixes for recent GLSL display space conversions
- Building without OCIO will give correct results again
- If GLSL failed to compile, fallback to glaDrawPixelsAuto
  will happen.
2013-04-02 17:28:29 +00:00
Sergey Sharybin
2dff7c01ad Implement GPU-side display transform for clip editor
Implemented using GLSL API from OpenColorIO library and
some general functions were added to it's c-api:

- OCIO_setupGLSLDraw prepares OpenGL context for GPU-based
  transformation for a giver processor.

  This function compiles and links shader, sets  up it's
  argument. After this transformation would be applied
  on an image displaying as a 2D texture.

  So, glaDrawPixelsTex called after OCIO_setupGLSLDraw will
  do a proper color space transform.

- OCIO_finishGLSLDraw restores OpenGL context after all
  color-managed display is over.

- OCIO_freeOGLState frees allocated state structure used
  for cacheing some GLSL-related stuff.

There're some utility functions in IMB_colormanagent which
are basically proxies to lower level OCIO functions but
which could be used from any place in blender.

Chacheing of movie clip frame on GPU is also removed now,
and either glaDrawPixelsTex or glaDrawPixelsAuto are used
for display now. This is so no code duplication happens
now and no large textures are lurking around in GPU memory.

Known issues:
- Texture buffer and GLSL are no longer checking for
  video card capabilities, possibly could lead to some
  artifacts on crappy drivers/cards.

- Only float buffers are displaying using GLSL, byte
  buffers will still use fallback display method.

  This is to be addressed later.

- If RGB curves are used as a part of display transform,
  GLSL display will also be disabled. This is also thing
  to be solved later.

Additional changes:

- glaDrawPixelsTexScaled will now use RGBA16F as an
  internal format of storing textures when it's used
  to draw float buffer. This is needed so LUT are
  applied without precision loss.
2013-03-29 16:02:27 +00:00
Campbell Barton
6a51379bf7 tweaks to clang so blender can build with -Werror 2013-03-14 07:25:54 +00:00
Sergey Sharybin
4c3620c69d Fixed compilation error on widows
Was caused by mixing up own C-API typedefs with OCIO's
2012-10-05 10:05:26 +00:00
Sergey Sharybin
ef107d1a4d Color Management: fallback to stub ocio implementation in cases when
ocio configuration file failed to load

This solves issues with infinite NULL-checks to prevent crashes in
such situations. Currently only happens if there's no configuration
file at all, but could be tweaked further to fallback if this file
isn't usable by blender.
2012-10-04 13:39:08 +00:00