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https://git.dev.opencascade.org/repos/occt.git
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72f6dc612c
OpenGl_ShaderManager - metallic-roughness, emissive, occlusion and normal texture maps are now supported by PBR. Emissive, occlusion and normal texture maps are now supported by Phong shading model. Path-Tracing now handles metallic-roughness and emissive texture maps. Graphic3d_TextureUnit enumeration has been extended by new values corresponding to supported texture maps. OpenGl_TextureSet and OpenGl_ShaderProgram have been extended with bitmask Graphic3d_TextureSetBits identifying texture slots read from GLSL Program and slots defined within Texture Set to avoid undefined behavior by binding mock textures. OpenGl_TextureSet now duplicates texture unit information to handle textures shared across multiple slots (like Occlusion [R] + Metallic-Roughness [GB]). OpenGl_Context::BindTextures() has been extended with active GLSL program paramter to set mock textures to texture units used by program but undefined by texture set. OpenGl_Workspace::ApplyAspects() has been extended with parameter to avoid bining texture set.
266 lines
11 KiB
GLSL
266 lines
11 KiB
GLSL
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//! @file Declarations.glsl 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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#define occTextureCube texture
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#define occTextureCubeLod textureLod
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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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#define occTextureCube textureCube
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#define occTextureCubeLod textureCubeLod
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#endif
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#ifdef GL_ES
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#if (__VERSION__ >= 300)
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#define THE_PREC_ENUM highp // lowp should be enough for enums but triggers driver bugs
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#else
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#define THE_PREC_ENUM lowp
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#endif
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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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// Pi number definitions
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#define PI 3.141592654
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#define PI_2 6.283185307
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#define PI_DIV_2 1.570796327
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#define PI_DIV_3 1.047197551
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#define PI_DIV_4 0.785398163
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#define INV_PI 0.318309886
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#define INV_PI_2 0.159154943
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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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#if defined(THE_IS_PBR)
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uniform sampler2D occEnvLUT; //!< Environment Lookup Table
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uniform sampler2D occDiffIBLMapSHCoeffs; //!< Packed diffuse (irradiance) IBL map's spherical harmonics coefficients
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uniform samplerCube occSpecIBLMap; //!< Specular IBL map
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uniform int occNbSpecIBLLevels; //!< Number of mipmap levels used in occSpecIBLMap to store different roughness values maps
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vec3 occDiffIBLMap (in vec3 theNormal); //!< Unpacks spherical harmonics coefficients to diffuse IBL map's values
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#endif
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// light type enumeration (same as Graphic3d_TypeOfLightSource)
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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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//! Type of light source, int (see OccLightType enum).
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#define occLight_Type(theId) occLightSourcesTypes[theId].x
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//! Is light a headlight, int?
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#define occLight_IsHeadlight(theId) (occLightSourcesTypes[theId].y != 0)
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//! Specular intensity (equals to diffuse), vec4.
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#define occLight_Specular(theId) occLightSources[theId * 4 + 0]
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//! Position of specified light source, vec4.
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#define occLight_Position(theId) occLightSources[theId * 4 + 1]
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//! Direction of specified spot light source, vec4.
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#define occLight_SpotDirection(theId) occLightSources[theId * 4 + 2]
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//! Maximum spread angle of the spot light (in radians), float.
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#define occLight_SpotCutOff(theId) occLightSources[theId * 4 + 3].z
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//! Attenuation of the spot light intensity (from 0 to 1), float.
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#define occLight_SpotExponent(theId) occLightSources[theId * 4 + 3].w
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#if defined(THE_IS_PBR)
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//! Intensity of light source (>= 0), float.
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#define occLight_Intensity(theId) occLightSources[theId * 4 + 0].a
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#else
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//! Diffuse intensity (equals to Specular), vec4.
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#define occLight_Diffuse(theId) occLightSources[theId * 4 + 0]
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//! Const attenuation factor of positional light source, float.
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#define occLight_ConstAttenuation(theId) occLightSources[theId * 4 + 3].x
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//! Linear attenuation factor of positional light source, float.
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#define occLight_LinearAttenuation(theId) occLightSources[theId * 4 + 3].y
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#endif
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#endif
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#if defined(THE_IS_PBR)
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//! Converts roughness value from range [0, 1] to real value for calculations
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float occRoughness (in float theNormalizedRoughness);
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// Front/back material properties accessors
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vec4 occPBRMaterial_Color(in bool theIsFront); //!< Base color of PBR material
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float occPBRMaterial_Metallic(in bool theIsFront); //!< Metallic coefficient
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float occPBRMaterial_NormalizedRoughness(in bool theIsFront); //!< Normalized roughness coefficient
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vec3 occPBRMaterial_Emission(in bool theIsFront); //!< Light intensity emitted by material
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float occPBRMaterial_IOR(in bool theIsFront); //!< Index of refraction
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#else
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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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#endif
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#ifdef THE_HAS_DEFAULT_SAMPLER
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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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#endif //! occSampler1, occSampler2,... should be defined in GLSL program body for multitexturing
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#if defined(THE_HAS_TEXTURE_COLOR)
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#define occTextureColor(theMatColor, theTexCoord) (theMatColor * occTexture2D(occSamplerBaseColor, theTexCoord))
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#else
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#define occTextureColor(theMatColor, theTexCoord) theMatColor
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#endif
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#if defined(THE_HAS_TEXTURE_OCCLUSION) && defined(FRAGMENT_SHADER)
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uniform sampler2D occSamplerOcclusion; //!< R occlusion texture sampler
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#define occTextureOcclusion(theColor, theTexCoord) theColor *= occTexture2D(occSamplerOcclusion, theTexCoord).r;
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#else
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#define occTextureOcclusion(theColor, theTexCoord)
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#endif
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#if defined(THE_HAS_TEXTURE_EMISSIVE) && defined(FRAGMENT_SHADER)
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uniform sampler2D occSamplerEmissive; //!< RGB emissive texture sampler
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#define occTextureEmissive(theMatEmis, theTexCoord) (theMatEmis * occTexture2D(occSamplerEmissive, theTexCoord).rgb)
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#else
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#define occTextureEmissive(theMatEmis, theTexCoord) theMatEmis
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#endif
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#if defined(THE_HAS_TEXTURE_NORMAL) && defined(FRAGMENT_SHADER)
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uniform sampler2D occSamplerNormal; //!< XYZ normal texture sampler with W==0 indicating no texture
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#define occTextureNormal(theTexCoord) occTexture2D(occSamplerNormal, theTexCoord)
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#else
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#define occTextureNormal(theTexCoord) vec4(0.0) // no normal map
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#endif
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#if defined(THE_HAS_TEXTURE_METALROUGHNESS) && defined(FRAGMENT_SHADER)
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uniform sampler2D occSamplerMetallicRoughness; //!< BG metallic-roughness texture sampler
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#define occTextureRoughness(theRoug, theTexCoord) (theRoug * occTexture2D(occSamplerMetallicRoughness, theTexCoord).g)
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#define occTextureMetallic(theMet, theTexCoord) (theMet * occTexture2D(occSamplerMetallicRoughness, theTexCoord).b)
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#else
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#define occTextureRoughness(theRoug, theTexCoord) theRoug
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#define occTextureMetallic(theMet, theTexCoord) theMet
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#endif
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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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uniform float occAlphaCutoff; //!< alpha test cutoff value
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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 occClipPlaneChains[THE_MAX_CLIP_PLANES]; //! Indicating the number of planes in the Chain
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uniform THE_PREC_ENUM int occClipPlaneCount; //!< Total number of clip planes
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#endif
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//! @endfile Declarations.glsl
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