Samples: InstancedViewports - refactor to work with Cameras

Author: paroj

Samples/Media/materials/programs/GLSL/SampleLib_InstancedViewports.glsl

@@ -29,36 +29,22 @@ furnished to do so, subject to the following conditions:
 // Transform the output position to the current "monitor"
 //-----------------------------------------------------------------------------
 
+#ifdef OGRE_VERTEX_SHADER
 void SGX_InstancedViewportsTransform(
     in vec4 i_position,
-    in mat4 i_worldViewMatrix,
-    in mat4 i_projectionMatrix,
-    in vec4 i_viewportOffsetMatrixR0,
-    in vec4 i_viewportOffsetMatrixR1,
-    in vec4 i_viewportOffsetMatrixR2,
-    in vec4 i_viewportOffsetMatrixR3,
-    in vec2 i_monitorsCount,
+    in mat4 viewportOffsetArray[NUM_MONITORS],
     in vec4 i_monitorIndex,
     out vec4 o_position)
 {
-    o_position = mul(i_worldViewMatrix, i_position);
-    mat4 viewportOffset = mtxFromRows(i_viewportOffsetMatrixR0,
-                                      i_viewportOffsetMatrixR1,
-                                      i_viewportOffsetMatrixR2,
-                                      i_viewportOffsetMatrixR3);
-
-    o_position = mul(viewportOffset, o_position);
-    o_position = mul(i_projectionMatrix, o_position);
-
-    vec2 monitorIndexNorm = i_monitorIndex.xy - ((i_monitorsCount - 1.0)/2.0);
-    o_position.xy =
-        (o_position.xy + (o_position.w * monitorIndexNorm)*2.0) / i_monitorsCount;
+    mat4 viewportOffset = viewportOffsetArray[int(i_monitorIndex.z)];
+    o_position = mul(viewportOffset, i_position);
 }
+#endif
 
 //-----------------------------------------------------------------------------
 // Discard any pixel that is outside the bounds of the current "monitor"
 //-----------------------------------------------------------------------------
-
+#ifdef OGRE_FRAGMENT_SHADER
 void SGX_InstancedViewportsDiscardOutOfBounds(
     in vec2 i_monitorsCount,
     in vec4 i_monitorIndex,
@@ -72,8 +58,8 @@ void SGX_InstancedViewportsDiscardOutOfBounds(
     float maxM = max(boxedXY.x,boxedXY.y);
     if (maxM >= 0.5)
     {
-#ifdef OGRE_FRAGMENT_SHADER
+
         discard;
-#endif
     }
 }
+#endif

Samples/ShaderSystem/include/OgreShaderExInstancedViewports.h

@@ -82,66 +82,22 @@ class ShaderExInstancedViewports : public SubRenderState
 
     /** Set the monitors count. */
     void                    setMonitorsCount        (const Vector2 monitorsCount);
-    
-    /** Return the monitors count. */
-    Vector2                 getMonitorsCount        () const { return mMonitorsCount; }
+
+    void setParameter(const String& name, const Any& value) override;
 
     static String Type;
 
 // Protected methods.
 protected:
-    
+    bool createCpuSubPrograms(ProgramSet* programSet) override;
 
-    /** 
-    @see SubRenderState::resolveParameters.
-    */
-    bool            resolveParameters       (ProgramSet* programSet) override;
+    UniformParameterPtr     mPSInMonitorsCount;
+    UniformParameterPtr     mVSInMatrixArray;
 
-    /** 
-    @see SubRenderState::resolveDependencies.
-    */
-    bool            resolveDependencies     (ProgramSet* programSet) override;
-
-    /** 
-    @see SubRenderState::addFunctionInvocations.
-    */
-    bool            addFunctionInvocations  (ProgramSet* programSet) override;
-
-    /** 
-    Internal method that adds related vertex shader functions invocations.
-    */
-    bool            addVSInvocations                (Function* vsMain, const int groupOrder);
-
-
-    /** 
-    Internal method that adds related pixel shader functions invocations.
-    */
-    bool            addPSInvocations                (Function* psMain, const int groupOrder);
-
-
-// Attributes.
-protected:  
-    ParameterPtr            mVSInPosition;      // Vertex shader original input position in projective space.
-    ParameterPtr            mVSOriginalOutPositionProjectiveSpace;      // Vertex shader original output position in projective space.
-    ParameterPtr            mVSOutPositionProjectiveSpace;      // Vertex shader output texcord position in projective space.
-    ParameterPtr            mPSInPositionProjectiveSpace;       // Pixel shader input position in projective space.
-    UniformParameterPtr     mVSInMonitorsCount;                 // Vertex shader uniform monitors count.        
-    UniformParameterPtr     mPSInMonitorsCount;                 // Pixel shader uniform monitors count.     
-    ParameterPtr            mVSInMonitorIndex;                  // Vertex shader uniform monitor index.     
-    ParameterPtr            mVSOutMonitorIndex;                 // Vertex shader output monitor index.      
-    ParameterPtr            mPSInMonitorIndex;                  // Pixel shader input monitor index.    
-
-    ParameterPtr            mVSInViewportOffsetMatrixR0;    
-    ParameterPtr            mVSInViewportOffsetMatrixR1;    
-    ParameterPtr            mVSInViewportOffsetMatrixR2;    
-    ParameterPtr            mVSInViewportOffsetMatrixR3;    
-
-    UniformParameterPtr     mWorldViewMatrix;                       // world & view parameter.
-    UniformParameterPtr     mProjectionMatrix;                      // projection parameter.
-
-    Vector2                 mMonitorsCount;
+    Vector2                 mViewportGrid;
     bool                    mMonitorsCountChanged;
 
+    std::vector<Camera*>    mCameras;
 };