Multiple #extensions may be specified for the same shader set, and all of them must be present in order for the set to be loaded. The parameter must be the exact name of the GL extension to use, such as GL_ARB_sample_shading or GL_EXT_framebuffer_object. The #extension directive defines a OpenGL extension that must be present in order for the shader set to be accepted. At least one #version directive must exist, before any shader files are specified. The highest version supported by the implementation will be loaded. It may be defined multiple times, each time with a different value defining a separate set of files to load. This is the same as the GLSL directive, except that core, compatibility, and es modifiers are not allowed. The #version directive defines the GLSL version this shader uses. The #name directive gives the shader a descriptive name. In the OpenGL information for COMBINED_VERT_UNIFORM_BLOCKS and others). There are a limited number of uniform blocksĪvailable in any shader stage (see Help ▸ About Houdini and Show Details, Uniforms, uniform blocks, and named vertex inputs ( P, Cd, Alpha, N) whichĬorrespond to their Houdini attribute names.īesides the glH_ Houdini uniforms listed above, the viewport also Instead, all information is passed through The predefined vertex shader inputs and outputs ( glVertex, glNormal, glColor, Uniforms, transform matrices ( gl_ProjectionMatrix, gl_ModelviewMatrix), and In addition, the GLSL built-ins are deprecated. Lookup primitive and vertex attributes (the vertex shader can only lookup vertex This makes parts of the shaders a bit moreĬomplicated, such as the geometry shader. The viewport pushes many responsibilities to the GPU, in order to improve
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