0024192: Adding support for shaders to OCCT visualization toolkit

src/Shaders/Declarations.glsl

@@ -0,0 +1,192 @@
+#define _OCC_MAX_LIGHTS_ 8
+
+#define _OCC_MAX_CLIP_PLANES_ 8
+
+
+//! OCCT ambient light source.
+const int occAmbientLight = 0;
+
+//! OCCT directional light source.
+const int occDirectLight = 1;
+
+//! OCCT isotropic point light source.
+const int occPointLight = 2;
+
+//! OCCT spot light source.
+const int occSpotLight = 3;
+
+
+//! Parameters of OCCT light source.
+struct occLightSource
+{
+  //! Type of light source.
+  int Type;
+  
+  //! Is light a headlight?
+  int Head;
+  
+  //! Ambient intensity.
+  vec3 Ambient;
+  
+  //! Diffuse intensity.
+  vec3 Diffuse;
+  
+  //! Specular intensity.
+  vec3 Specular;
+  
+  //! Position of light source.
+  vec3 Position;
+  
+  //! Direction of the spot light.
+  vec3 SpotDirection;
+    
+  //! Maximum spread angle of the spot light (in radians).
+  float SpotCutoff;
+  
+  //! Attenuation of the spot light intensity (from 0 to 1).
+  float SpotExponent;
+
+  //! Const attenuation factor of positional light source.
+  float ConstAttenuation;
+  
+  //! Linear attenuation factor of positional light source.
+  float LinearAttenuation;
+};
+
+//! Parameters of OCCT material.
+struct occMaterialParams
+{
+  //! Emission color.
+  vec4 Emission;
+  
+  //! Ambient reflection.
+  vec4 Ambient;
+  
+  //! Diffuse reflection.
+  vec4 Diffuse;
+  
+  //! Specular reflection.
+  vec4 Specular;
+  
+  //! Specular exponent.
+  float Shininess;
+  
+  //! Transparency coefficient.
+  float Transparency;
+};
+
+//! OCCT view-space clipping plane.
+const int occEquationCoordsView = 0;
+
+//! OCCT world-space clipping plane.
+const int occEquationCoordsWorld = 1;
+
+//! Parameters of OCCT clipping plane.
+struct occClipPlane
+{
+  //! Plane equation.
+  vec4 Equation;
+
+  //! Equation space.
+  int Space;
+};
+
+#ifdef VERTEX_SHADER
+
+/////////////////////////////////////////////////////////////////////
+// OCCT vertex attributes
+
+// Note: At the moment, we just 'rename' the default OpenGL
+// vertex attributes from compatibility profile. In the next
+// release old functionality will be removed from shader API.
+
+//! Vertex color.
+#define occColor gl_Color
+
+//! Normal coordinates.
+#define occNormal gl_Normal
+
+//! Vertex coordinates.
+#define occVertex gl_Vertex
+
+//! Texture coordinates.
+#define occTexCoord gl_MultiTexCoord0
+
+#endif
+
+/////////////////////////////////////////////////////////////////////
+// OCCT matrix state
+
+//! World-view matrix.
+uniform mat4 occWorldViewMatrix;
+
+//! Projection matrix.
+uniform mat4 occProjectionMatrix;
+
+//! Model-world matrix.
+uniform mat4 occModelWorldMatrix;
+
+//-------------------------------------------------------
+
+//! Inverse of the world-view matrix.
+uniform mat4 occWorldViewMatrixInverse;
+
+//! Inverse of the projection matrix.
+uniform mat4 occProjectionMatrixInverse;
+
+//! Inverse of the model-world matrix.
+uniform mat4 occModelWorldMatrixInverse;
+
+//-------------------------------------------------------
+
+//! Transpose of the world-view matrix.
+uniform mat4 occWorldViewMatrixTranspose;
+
+//! Transpose of the projection matrix.
+uniform mat4 occProjectionMatrixTranspose;
+
+//! Transpose of the model-world matrix.
+uniform mat4 occModelWorldMatrixTranspose;
+
+//-------------------------------------------------------
+
+//! Transpose of the inverse of the world-view matrix.
+uniform mat4 occWorldViewMatrixInverseTranspose;
+
+//! Transpose of the inverse of the projection matrix.
+uniform mat4 occProjectionMatrixInverseTranspose;
+
+//! Transpose of the inverse of the model-world matrix.
+uniform mat4 occModelWorldMatrixInverseTranspose;
+
+/////////////////////////////////////////////////////////////////////
+// OCCT light source state
+
+//! Array of OCCT light sources.
+uniform occLightSource occLightSources[_OCC_MAX_LIGHTS_];
+
+//! Total number of OCCT light sources.
+uniform int occLightSourcesCount;
+
+/////////////////////////////////////////////////////////////////////
+// OCCT material state
+
+//! Parameters of OCCT back material.
+uniform occMaterialParams occBackMaterial;
+
+//! Parameters of OCCT front material.
+uniform occMaterialParams occFrontMaterial;
+
+//! Are front and back faces distinguished?
+uniform int occDistinguishingMode;
+
+//! Is texture enabled?
+uniform int occTextureEnable;
+
+//! Current active sampler.
+uniform sampler2D occActiveSampler;
+
+/////////////////////////////////////////////////////////////////////
+// OCCT clipping planes state
+
+uniform occClipPlane occClipPlanes[_OCC_MAX_CLIP_PLANES_];