occt: master a1073ae2

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Author Committer Branch Timestamp Parent
apl bugmaster master 2017-04-25 12:10:15 master 91515621
Affected Issues  0027925: Visualization - implement order-independent transparency algorithm within rasterization rendering
Changeset 0027925: Visualization - implement order-independent transparency algorithm within rasterization rendering

Weighted, Blended Order-Independent Transparency algorithm has been added rasterization pipeline.
In contrast to classical blending transparency it makes transparent objects look independent
from point of view. It also gives better depth occlusion when being used together with a weight factor
based on value of a GL depth buffer. The feature supports desktop OpenGL, OpenGL ES 3.0, ANGLE
and can be used together with MSAA on desktop GL.

To be used it require availability of:
1) Shaders pipeline.
2) Floating point color format for framebuffer (GL_ARB_color_buffer_float).
3) Multiple render targets (GL_ARB_draw_buffers).

Patch does not modify API and does not require application porting.
It adds new rendering options to Graphic3d_RenderingParams structure:
a) Transparency method from enumeration.
b) Scalar factor [0-1] controlling influence of a fragment's depth to its visibility.

Patch also simplifies processing of transparent objects for standard method:
rendering priority of transparent graphical structures is managed automatically,
therefore there is no need to care about it at application's side.
mod - src/AIS/AIS_Shape.cxx Diff File
mod - src/AIS/AIS_Triangulation.cxx Diff File
mod - src/D3DHost/D3DHost_FrameBuffer.cxx Diff File
mod - src/Graphic3d/FILES Diff File
mod - src/Graphic3d/Graphic3d_RenderingParams.hxx Diff File
add - src/Graphic3d/Graphic3d_RenderTransparentMethod.hxx Diff File
mod - src/Graphic3d/Graphic3d_TypeOfLimit.hxx Diff File
mod - src/OpenGl/OpenGl_CappingAlgo.cxx Diff File
mod - src/OpenGl/OpenGl_CappingAlgo.hxx Diff File
mod - src/OpenGl/OpenGl_Context.cxx Diff File
mod - src/OpenGl/OpenGl_Context.hxx Diff File
mod - src/OpenGl/OpenGl_Element.hxx Diff File
mod - src/OpenGl/OpenGl_FrameBuffer.cxx Diff File
mod - src/OpenGl/OpenGl_FrameBuffer.hxx Diff File
mod - src/OpenGl/OpenGl_GlFunctions.hxx Diff File
mod - src/OpenGl/OpenGl_GraphicDriver.cxx Diff File
mod - src/OpenGl/OpenGl_Layer.cxx Diff File
mod - src/OpenGl/OpenGl_LayerList.cxx Diff File
mod - src/OpenGl/OpenGl_LayerList.hxx Diff File
mod - src/OpenGl/OpenGl_PrimitiveArray.hxx Diff File
mod - src/OpenGl/OpenGl_RenderFilter.hxx Diff File
mod - src/OpenGl/OpenGl_SetOfShaderPrograms.hxx Diff File
mod - src/OpenGl/OpenGl_ShaderManager.cxx Diff File
mod - src/OpenGl/OpenGl_ShaderManager.hxx Diff File
mod - src/OpenGl/OpenGl_ShaderProgram.cxx Diff File
mod - src/OpenGl/OpenGl_ShaderProgram.hxx Diff File
mod - src/OpenGl/OpenGl_ShaderStates.hxx Diff File
mod - src/OpenGl/OpenGl_Texture.cxx Diff File
mod - src/OpenGl/OpenGl_View.cxx Diff File
mod - src/OpenGl/OpenGl_View.hxx Diff File
mod - src/OpenGl/OpenGl_View_Redraw.cxx Diff File
mod - src/OpenGl/OpenGl_Workspace.cxx Diff File
mod - src/OpenGl/OpenGl_Workspace.hxx Diff File
mod - src/Shaders/Declarations.glsl Diff File
mod - src/Shaders/PhongShading.fs Diff File
mod - src/Shaders/Shaders_Declarations_glsl.pxx Diff File
mod - src/ViewerTest/ViewerTest_ViewerCommands.cxx Diff File
add - tests/v3d/transparency/begin Diff File
add - tests/v3d/transparency/blend Diff File
add - tests/v3d/transparency/highlight Diff File