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b17e5bae1a
Enable multiple draw buffers in shader program only if its required by specific application. occSetFragColor() - a new GLSL function has been introduced as an alternative to setting occFragColor/occFragCoverage variables.
177 lines
7.8 KiB
GLSL
177 lines
7.8 KiB
GLSL
// Created on: 2013-10-10
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// Created by: Denis BOGOLEPOV
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// Copyright (c) 2013-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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//! @file Declarations.glsl
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//! This files includes definition of common uniform variables in OCCT GLSL programs
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//! @def THE_MAX_LIGHTS
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//! Specifies the length of array of lights, which is 8 by default. Defined by Shader Manager.
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// #define THE_MAX_LIGHTS 8
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//! @def THE_MAX_CLIP_PLANES
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//! Specifies the length of array of clipping planes, which is 8 by default. Defined by Shader Manager.
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// #define THE_MAX_CLIP_PLANES 8
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//! @def THE_NB_FRAG_OUTPUTS
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//! Specifies the length of array of Fragment Shader outputs, which is 1 by default. Defined by Shader Manager.
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// #define THE_NB_FRAG_OUTPUTS 1
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// compatibility macros
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#if (__VERSION__ >= 130)
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#define THE_ATTRIBUTE in
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#define THE_SHADER_IN in
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#define THE_SHADER_OUT out
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#define THE_OUT out
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#define occTexture1D texture
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#define occTexture2D texture
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#define occTexture3D texture
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#else
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#define THE_ATTRIBUTE attribute
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#define THE_SHADER_IN varying
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#define THE_SHADER_OUT varying
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#define THE_OUT
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#define occTexture1D texture1D
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#define occTexture2D texture2D
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#define occTexture3D texture3D
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#endif
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#ifdef GL_ES
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#define THE_PREC_ENUM lowp // enumerations should fit into lowp range
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#else
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#define THE_PREC_ENUM
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#endif
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// Vertex attributes
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#ifdef VERTEX_SHADER
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THE_ATTRIBUTE vec4 occVertex;
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THE_ATTRIBUTE vec3 occNormal;
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THE_ATTRIBUTE vec4 occTexCoord;
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THE_ATTRIBUTE vec4 occVertColor;
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#elif defined(FRAGMENT_SHADER)
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#if (__VERSION__ >= 130)
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#ifdef OCC_ENABLE_draw_buffers
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out vec4 occFragColorArray[THE_NB_FRAG_OUTPUTS];
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#define occFragColorArrayAlias occFragColorArray
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#define occFragColor0 occFragColorArray[0]
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#else
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out vec4 occFragColor0;
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#endif
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#else
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#ifdef OCC_ENABLE_draw_buffers
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#define occFragColorArrayAlias gl_FragData
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#define occFragColor0 gl_FragData[0]
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#else
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#define occFragColor0 gl_FragColor
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#endif
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#endif
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#if (THE_NB_FRAG_OUTPUTS >= 2)
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#define occFragColor1 occFragColorArrayAlias[1]
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#else
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vec4 occFragColor1;
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#endif
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#if (THE_NB_FRAG_OUTPUTS >= 3)
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#define occFragColor2 occFragColorArrayAlias[2]
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#else
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vec4 occFragColor2;
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#endif
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#if (THE_NB_FRAG_OUTPUTS >= 4)
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#define occFragColor3 occFragColorArrayAlias[3]
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#else
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vec4 occFragColor3;
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#endif
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// Built-in outputs notation
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#define occFragColor occFragColor0
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#define occFragCoverage occFragColor1
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//! Define the main Fragment Shader output - color value.
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void occSetFragColor (in vec4 theColor);
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#endif
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// Matrix state
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uniform mat4 occWorldViewMatrix; //!< World-view matrix
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uniform mat4 occProjectionMatrix; //!< Projection matrix
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uniform mat4 occModelWorldMatrix; //!< Model-world matrix
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uniform mat4 occWorldViewMatrixInverse; //!< Inverse of the world-view matrix
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uniform mat4 occProjectionMatrixInverse; //!< Inverse of the projection matrix
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uniform mat4 occModelWorldMatrixInverse; //!< Inverse of the model-world matrix
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uniform mat4 occWorldViewMatrixTranspose; //!< Transpose of the world-view matrix
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uniform mat4 occProjectionMatrixTranspose; //!< Transpose of the projection matrix
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uniform mat4 occModelWorldMatrixTranspose; //!< Transpose of the model-world matrix
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uniform mat4 occWorldViewMatrixInverseTranspose; //!< Transpose of the inverse of the world-view matrix
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uniform mat4 occProjectionMatrixInverseTranspose; //!< Transpose of the inverse of the projection matrix
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uniform mat4 occModelWorldMatrixInverseTranspose; //!< Transpose of the inverse of the model-world matrix
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// light type enumeration
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const int OccLightType_Direct = 1; //!< directional light source
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const int OccLightType_Point = 2; //!< isotropic point light source
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const int OccLightType_Spot = 3; //!< spot light source
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// Light sources
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uniform vec4 occLightAmbient; //!< Cumulative ambient color
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#if defined(THE_MAX_LIGHTS) && (THE_MAX_LIGHTS > 0)
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uniform THE_PREC_ENUM int occLightSourcesCount; //!< Total number of light sources
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int occLight_Type (in int theId); //!< Type of light source
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int occLight_IsHeadlight (in int theId); //!< Is light a headlight?
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vec4 occLight_Diffuse (in int theId); //!< Diffuse intensity for specified light source
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vec4 occLight_Specular (in int theId); //!< Specular intensity (currently - equals to diffuse intencity)
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vec4 occLight_Position (in int theId); //!< Position of specified light source
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vec4 occLight_SpotDirection (in int theId); //!< Direction of specified spot light source
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float occLight_ConstAttenuation (in int theId); //!< Const attenuation factor of positional light source
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float occLight_LinearAttenuation (in int theId); //!< Linear attenuation factor of positional light source
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float occLight_SpotCutOff (in int theId); //!< Maximum spread angle of the spot light (in radians)
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float occLight_SpotExponent (in int theId); //!< Attenuation of the spot light intensity (from 0 to 1)
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#endif
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// Front material properties accessors
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vec4 occFrontMaterial_Emission(void); //!< Emission color
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vec4 occFrontMaterial_Ambient(void); //!< Ambient reflection
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vec4 occFrontMaterial_Diffuse(void); //!< Diffuse reflection
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vec4 occFrontMaterial_Specular(void); //!< Specular reflection
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float occFrontMaterial_Shininess(void); //!< Specular exponent
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float occFrontMaterial_Transparency(void); //!< Transparency coefficient
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// Back material properties accessors
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vec4 occBackMaterial_Emission(void); //!< Emission color
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vec4 occBackMaterial_Ambient(void); //!< Ambient reflection
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vec4 occBackMaterial_Diffuse(void); //!< Diffuse reflection
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vec4 occBackMaterial_Specular(void); //!< Specular reflection
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float occBackMaterial_Shininess(void); //!< Specular exponent
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float occBackMaterial_Transparency(void); //!< Transparency coefficient
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#define occActiveSampler occSampler0 //!< alias for backward compatibility
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#define occSamplerBaseColor occSampler0 //!< alias to a base color texture
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uniform sampler2D occSampler0; //!< current active sampler;
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//! occSampler1, occSampler2,... should be defined in GLSL program body for multitexturing
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uniform vec4 occColor; //!< color value (in case of disabled lighting)
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uniform THE_PREC_ENUM int occDistinguishingMode; //!< Are front and back faces distinguished?
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uniform THE_PREC_ENUM int occTextureEnable; //!< Is texture enabled?
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uniform vec4 occTexTrsf2d[2]; //!< 2D texture transformation parameters
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uniform float occPointSize; //!< point size
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//! Parameters of blended order-independent transparency rendering algorithm
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uniform int occOitOutput; //!< Enable bit for writing output color buffers for OIT (occFragColor, occFragCoverage)
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uniform float occOitDepthFactor; //!< Influence of the depth component to the coverage of the accumulated fragment
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//! Parameters of clipping planes
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#if defined(THE_MAX_CLIP_PLANES) && (THE_MAX_CLIP_PLANES > 0)
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uniform vec4 occClipPlaneEquations[THE_MAX_CLIP_PLANES];
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uniform THE_PREC_ENUM int occClipPlaneCount; //!< Total number of clip planes
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#endif
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