0029337: Visualization, TKOpenGl - visual artifacts on Intel Broadwell GPU
[occt.git] / src / Shaders / Declarations.glsl
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d5f74e42 1// Created on: 2013-10-10
2// Created by: Denis BOGOLEPOV
3// Copyright (c) 2013-2014 OPEN CASCADE SAS
4//
5// This file is part of Open CASCADE Technology software library.
6//
7// This library is free software; you can redistribute it and/or modify it under
8// the terms of the GNU Lesser General Public License version 2.1 as published
9// by the Free Software Foundation, with special exception defined in the file
10// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11// distribution for complete text of the license and disclaimer of any warranty.
12//
13// Alternatively, this file may be used under the terms of Open CASCADE
14// commercial license or contractual agreement.
15
daf73ab7 16//! @file Declarations.glsl
17//! This files includes definition of common uniform variables in OCCT GLSL programs
30f0ad28 18
daf73ab7 19//! @def THE_MAX_LIGHTS
20//! Specifies the length of array of lights, which is 8 by default. Defined by Shader Manager.
21// #define THE_MAX_LIGHTS 8
22
23//! @def THE_MAX_CLIP_PLANES
24//! Specifies the length of array of clipping planes, which is 8 by default. Defined by Shader Manager.
25// #define THE_MAX_CLIP_PLANES 8
30f0ad28 26
b17e5bae 27//! @def THE_NB_FRAG_OUTPUTS
28//! Specifies the length of array of Fragment Shader outputs, which is 1 by default. Defined by Shader Manager.
29// #define THE_NB_FRAG_OUTPUTS 1
30
b86bb3df 31// compatibility macros
32#if (__VERSION__ >= 130)
33 #define THE_ATTRIBUTE in
34 #define THE_SHADER_IN in
35 #define THE_SHADER_OUT out
36 #define THE_OUT out
ff6665dc 37 #define occTexture1D texture
b86bb3df 38 #define occTexture2D texture
ff6665dc 39 #define occTexture3D texture
b86bb3df 40#else
41 #define THE_ATTRIBUTE attribute
42 #define THE_SHADER_IN varying
43 #define THE_SHADER_OUT varying
44 #define THE_OUT
ff6665dc 45 #define occTexture1D texture1D
b86bb3df 46 #define occTexture2D texture2D
ff6665dc 47 #define occTexture3D texture3D
b86bb3df 48#endif
49
8a53d1c4 50#ifdef GL_ES
51 #define THE_PREC_ENUM lowp // enumerations should fit into lowp range
52#else
53 #define THE_PREC_ENUM
54#endif
55
12381341 56// Vertex attributes
12381341 57#ifdef VERTEX_SHADER
b86bb3df 58 THE_ATTRIBUTE vec4 occVertex;
59 THE_ATTRIBUTE vec3 occNormal;
60 THE_ATTRIBUTE vec4 occTexCoord;
61 THE_ATTRIBUTE vec4 occVertColor;
8e0a2b19 62#elif defined(FRAGMENT_SHADER)
63 #if (__VERSION__ >= 130)
64 #ifdef OCC_ENABLE_draw_buffers
b17e5bae 65 out vec4 occFragColorArray[THE_NB_FRAG_OUTPUTS];
66 #define occFragColorArrayAlias occFragColorArray
67 #define occFragColor0 occFragColorArray[0]
8e0a2b19 68 #else
b17e5bae 69 out vec4 occFragColor0;
8e0a2b19 70 #endif
177781da 71 #else
8e0a2b19 72 #ifdef OCC_ENABLE_draw_buffers
b17e5bae 73 #define occFragColorArrayAlias gl_FragData
74 #define occFragColor0 gl_FragData[0]
8e0a2b19 75 #else
b17e5bae 76 #define occFragColor0 gl_FragColor
8e0a2b19 77 #endif
a1073ae2 78 #endif
b17e5bae 79
80 #if (THE_NB_FRAG_OUTPUTS >= 2)
81 #define occFragColor1 occFragColorArrayAlias[1]
82 #else
83 vec4 occFragColor1;
84 #endif
85 #if (THE_NB_FRAG_OUTPUTS >= 3)
86 #define occFragColor2 occFragColorArrayAlias[2]
87 #else
88 vec4 occFragColor2;
89 #endif
90 #if (THE_NB_FRAG_OUTPUTS >= 4)
91 #define occFragColor3 occFragColorArrayAlias[3]
92 #else
93 vec4 occFragColor3;
94 #endif
95
96 // Built-in outputs notation
97 #define occFragColor occFragColor0
98 #define occFragCoverage occFragColor1
99
100 //! Define the main Fragment Shader output - color value.
101 void occSetFragColor (in vec4 theColor);
30f0ad28 102#endif
103
12381341 104// Matrix state
105uniform mat4 occWorldViewMatrix; //!< World-view matrix
106uniform mat4 occProjectionMatrix; //!< Projection matrix
107uniform mat4 occModelWorldMatrix; //!< Model-world matrix
108
109uniform mat4 occWorldViewMatrixInverse; //!< Inverse of the world-view matrix
110uniform mat4 occProjectionMatrixInverse; //!< Inverse of the projection matrix
111uniform mat4 occModelWorldMatrixInverse; //!< Inverse of the model-world matrix
112
113uniform mat4 occWorldViewMatrixTranspose; //!< Transpose of the world-view matrix
114uniform mat4 occProjectionMatrixTranspose; //!< Transpose of the projection matrix
115uniform mat4 occModelWorldMatrixTranspose; //!< Transpose of the model-world matrix
116
117uniform mat4 occWorldViewMatrixInverseTranspose; //!< Transpose of the inverse of the world-view matrix
118uniform mat4 occProjectionMatrixInverseTranspose; //!< Transpose of the inverse of the projection matrix
119uniform mat4 occModelWorldMatrixInverseTranspose; //!< Transpose of the inverse of the model-world matrix
120
121// light type enumeration
122const int OccLightType_Direct = 1; //!< directional light source
123const int OccLightType_Point = 2; //!< isotropic point light source
124const int OccLightType_Spot = 3; //!< spot light source
125
126// Light sources
8a53d1c4 127uniform vec4 occLightAmbient; //!< Cumulative ambient color
daf73ab7 128#if defined(THE_MAX_LIGHTS) && (THE_MAX_LIGHTS > 0)
8a53d1c4 129uniform THE_PREC_ENUM int occLightSourcesCount; //!< Total number of light sources
12381341 130int occLight_Type (in int theId); //!< Type of light source
131int occLight_IsHeadlight (in int theId); //!< Is light a headlight?
132vec4 occLight_Diffuse (in int theId); //!< Diffuse intensity for specified light source
133vec4 occLight_Specular (in int theId); //!< Specular intensity (currently - equals to diffuse intencity)
134vec4 occLight_Position (in int theId); //!< Position of specified light source
135vec4 occLight_SpotDirection (in int theId); //!< Direction of specified spot light source
136float occLight_ConstAttenuation (in int theId); //!< Const attenuation factor of positional light source
137float occLight_LinearAttenuation (in int theId); //!< Linear attenuation factor of positional light source
138float occLight_SpotCutOff (in int theId); //!< Maximum spread angle of the spot light (in radians)
139float occLight_SpotExponent (in int theId); //!< Attenuation of the spot light intensity (from 0 to 1)
daf73ab7 140#endif
12381341 141
142// Front material properties accessors
143vec4 occFrontMaterial_Emission(void); //!< Emission color
144vec4 occFrontMaterial_Ambient(void); //!< Ambient reflection
145vec4 occFrontMaterial_Diffuse(void); //!< Diffuse reflection
146vec4 occFrontMaterial_Specular(void); //!< Specular reflection
147float occFrontMaterial_Shininess(void); //!< Specular exponent
148float occFrontMaterial_Transparency(void); //!< Transparency coefficient
149
8625ef7e 150// Back material properties accessors
12381341 151vec4 occBackMaterial_Emission(void); //!< Emission color
152vec4 occBackMaterial_Ambient(void); //!< Ambient reflection
153vec4 occBackMaterial_Diffuse(void); //!< Diffuse reflection
154vec4 occBackMaterial_Specular(void); //!< Specular reflection
155float occBackMaterial_Shininess(void); //!< Specular exponent
156float occBackMaterial_Transparency(void); //!< Transparency coefficient
157
cc8cbabe 158#define occActiveSampler occSampler0 //!< alias for backward compatibility
159#define occSamplerBaseColor occSampler0 //!< alias to a base color texture
160uniform sampler2D occSampler0; //!< current active sampler;
161 //! occSampler1, occSampler2,... should be defined in GLSL program body for multitexturing
8a53d1c4 162uniform vec4 occColor; //!< color value (in case of disabled lighting)
163uniform THE_PREC_ENUM int occDistinguishingMode; //!< Are front and back faces distinguished?
164uniform THE_PREC_ENUM int occTextureEnable; //!< Is texture enabled?
79f4f036 165uniform vec4 occTexTrsf2d[2]; //!< 2D texture transformation parameters
8a53d1c4 166uniform float occPointSize; //!< point size
12381341 167
a1073ae2 168//! Parameters of blended order-independent transparency rendering algorithm
169uniform int occOitOutput; //!< Enable bit for writing output color buffers for OIT (occFragColor, occFragCoverage)
170uniform float occOitDepthFactor; //!< Influence of the depth component to the coverage of the accumulated fragment
171
12381341 172//! Parameters of clipping planes
daf73ab7 173#if defined(THE_MAX_CLIP_PLANES) && (THE_MAX_CLIP_PLANES > 0)
8a53d1c4 174uniform vec4 occClipPlaneEquations[THE_MAX_CLIP_PLANES];
8a53d1c4 175uniform THE_PREC_ENUM int occClipPlaneCount; //!< Total number of clip planes
daf73ab7 176#endif