OgreGLES2RenderSystem.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org

Copyright (c) 2000-2013 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/

#ifndef __GLES2RenderSystem_H__
#define __GLES2RenderSystem_H__

#include "OgreGLES2Prerequisites.h"

#include "OgreMaterialManager.h"
#include "OgreRenderSystem.h"
#include "OgreGLES2GpuProgram.h"

namespace Ogre {
    class GLES2Context;
    class GLES2Support;
    class GLES2RTTManager;
    class GLES2GpuProgramManager;
    class GLSLESProgramFactory;
#if !OGRE_NO_GLES2_CG_SUPPORT
    class GLSLESCgProgramFactory;
#endif
    class GLSLESGpuProgram;
    class HardwareBufferManager;

    class _OgreGLES2Export GLES2RenderSystem : public RenderSystem
    {
        private:
            typedef HashMap<GLenum, GLuint>  BindBufferMap;

            Matrix4 mViewMatrix;
            Matrix4 mWorldMatrix;
            Matrix4 mTextureMatrix;

            FilterOptions mMinFilter;
            FilterOptions mMipFilter;

            size_t mTextureCoordIndex[OGRE_MAX_TEXTURE_LAYERS];

            GLenum mTextureTypes[OGRE_MAX_TEXTURE_LAYERS];

            unsigned short mFixedFunctionTextureUnits;

            bool mColourWrite[4];

            bool mDepthWrite;

            uint32 mStencilMask;

            GLfloat mAutoTextureMatrix[16];

            bool mUseAutoTextureMatrix;

            GLES2Support *mGLSupport;

            /* The main GL context - main thread only */
            GLES2Context *mMainContext;

            /* The current GL context  - main thread only */
            GLES2Context *mCurrentContext;
            GLES2GpuProgramManager *mGpuProgramManager;
            GLSLESProgramFactory* mGLSLESProgramFactory;
#if !OGRE_NO_GLES2_CG_SUPPORT
            GLSLESCgProgramFactory* mGLSLESCgProgramFactory;
#endif
            HardwareBufferManager* mHardwareBufferManager;

            GLES2RTTManager *mRTTManager;

            GLenum mActiveTextureUnit;
            BindBufferMap mActiveBufferMap;

            bool mGLInitialised;

            unsigned int mDiscardBuffers;

            GLenum mPolygonMode;

            // local data member of _render that were moved here to improve performance
            // (save allocations)
            vector<GLuint>::type mRenderAttribsBound;

            GLint getCombinedMinMipFilter(void) const;

            GLES2GpuProgram* mCurrentVertexProgram;
            GLES2GpuProgram* mCurrentFragmentProgram;

            GLint getTextureAddressingMode(TextureUnitState::TextureAddressingMode tam) const;
            GLenum getBlendMode(SceneBlendFactor ogreBlend) const;

            bool activateGLTextureUnit(size_t unit);

        public:
            // Default constructor / destructor
            GLES2RenderSystem();
            virtual ~GLES2RenderSystem();
        
            friend class ShaderGeneratorTechniqueResolverListener;

            // ----------------------------------
            // Overridden RenderSystem functions
            // ----------------------------------
            const String& getName(void) const;
            ConfigOptionMap& getConfigOptions(void);
            void setConfigOption(const String &name, const String &value);
            String validateConfigOptions(void);
            RenderWindow* _initialise(bool autoCreateWindow, const String& windowTitle = "OGRE Render NativeWindowType");
            virtual RenderSystemCapabilities* createRenderSystemCapabilities() const;
            void initialiseFromRenderSystemCapabilities(RenderSystemCapabilities* caps, RenderTarget* primary);
            void reinitialise(void); // Used if settings changed mid-rendering
            void shutdown(void);
            void setAmbientLight(float r, float g, float b) { };   // Not supported
            void setShadingType(ShadeOptions so) { };   // Not supported
            void setLightingEnabled(bool enabled) { };   // Not supported

            RenderWindow* _createRenderWindow(const String &name, unsigned int width, unsigned int height, 
                bool fullScreen, const NameValuePairList *miscParams = 0);

            DepthBuffer* _createDepthBufferFor( RenderTarget *renderTarget );

            void _getDepthStencilFormatFor( GLenum internalColourFormat, GLenum *depthFormat,
                                            GLenum *stencilFormat );

            virtual MultiRenderTarget * createMultiRenderTarget(const String & name);

            void destroyRenderWindow(RenderWindow* pWin);
            String getErrorDescription(long errorNumber) const;
            VertexElementType getColourVertexElementType(void) const;
            void setNormaliseNormals(bool normalise) { };   // Not supported

            // -----------------------------
            // Low-level overridden members
            // -----------------------------
            void _useLights(const LightList& lights, unsigned short limit) { };   // Not supported
            bool areFixedFunctionLightsInViewSpace() const { return true; }
            void _setWorldMatrix(const Matrix4 &m);
            void _setViewMatrix(const Matrix4 &m);
            void _setProjectionMatrix(const Matrix4 &m);
            void _setSurfaceParams(const ColourValue &ambient,
                                   const ColourValue &diffuse, const ColourValue &specular,
                                   const ColourValue &emissive, Real shininess,
                                   TrackVertexColourType tracking) {}
            void _setPointParameters(Real size, bool attenuationEnabled,
                                     Real constant, Real linear, Real quadratic, Real minSize, Real maxSize) {}
            void _setPointSpritesEnabled(bool enabled) {}
            void _setTexture(size_t unit, bool enabled, const TexturePtr &tex);
            void _setTextureCoordSet(size_t stage, size_t index);
            void _setTextureCoordCalculation(size_t stage, TexCoordCalcMethod m,
                    const Frustum* frustum = 0) { };   // Not supported
            void _setTextureBlendMode(size_t stage, const LayerBlendModeEx& bm) { };   // Not supported
            void _setTextureAddressingMode(size_t stage, const TextureUnitState::UVWAddressingMode& uvw);
            void _setTextureBorderColour(size_t stage, const ColourValue& colour) { };   // Not supported
            void _setTextureMipmapBias(size_t unit, float bias) { };   // Not supported
            void _setTextureMatrix(size_t stage, const Matrix4& xform) { };   // Not supported
            void _setViewport(Viewport *vp);
            void _beginFrame(void);
            void _endFrame(void);
            void _setCullingMode(CullingMode mode);
            void _setDepthBufferParams(bool depthTest = true, bool depthWrite = true, CompareFunction depthFunction = CMPF_LESS_EQUAL);
            void _setDepthBufferCheckEnabled(bool enabled = true);
            void _setDepthBufferWriteEnabled(bool enabled = true);
            void _setDepthBufferFunction(CompareFunction func = CMPF_LESS_EQUAL);
            void _setDepthBias(float constantBias, float slopeScaleBias);
            void _setColourBufferWriteEnabled(bool red, bool green, bool blue, bool alpha);
            void _setFog(FogMode mode, const ColourValue& colour, Real density, Real start, Real end);
            void _convertProjectionMatrix(const Matrix4& matrix,
                    Matrix4& dest, bool forGpuProgram = false);
            void _makeProjectionMatrix(const Radian& fovy, Real aspect, Real nearPlane, Real farPlane,
                    Matrix4& dest, bool forGpuProgram = false);
            void _makeProjectionMatrix(Real left, Real right, Real bottom, Real top, 
                    Real nearPlane, Real farPlane, Matrix4& dest, bool forGpuProgram = false);
            void _makeOrthoMatrix(const Radian& fovy, Real aspect, Real nearPlane, Real farPlane,
                    Matrix4& dest, bool forGpuProgram = false);
            void _applyObliqueDepthProjection(Matrix4& matrix, const Plane& plane, 
                    bool forGpuProgram);
            void setClipPlane (ushort index, Real A, Real B, Real C, Real D);
            void enableClipPlane (ushort index, bool enable);
            void _setPolygonMode(PolygonMode level);
            void setStencilCheckEnabled(bool enabled);
            void setStencilBufferParams(CompareFunction func = CMPF_ALWAYS_PASS, 
                    uint32 refValue = 0, uint32 mask = 0xFFFFFFFF,
                    StencilOperation stencilFailOp = SOP_KEEP,
                    StencilOperation depthFailOp = SOP_KEEP,
                    StencilOperation passOp = SOP_KEEP,
                    bool twoSidedOperation = false);
            void _setTextureUnitFiltering(size_t unit, FilterType ftype, FilterOptions filter);
            void _setTextureLayerAnisotropy(size_t unit, unsigned int maxAnisotropy);
            void setVertexDeclaration(VertexDeclaration* decl) {}
            void setVertexBufferBinding(VertexBufferBinding* binding) {}
            void _render(const RenderOperation& op);
            void setScissorTest(bool enabled, size_t left = 0, size_t top = 0, size_t right = 800, size_t bottom = 600);
        
            void _setDiscardBuffers(unsigned int flags) { mDiscardBuffers = flags; }
            unsigned int getDiscardBuffers(void) { return mDiscardBuffers; }

            void clearFrameBuffer(unsigned int buffers,
                const ColourValue& colour = ColourValue::Black,
                Real depth = 1.0f, unsigned short stencil = 0);
            HardwareOcclusionQuery* createHardwareOcclusionQuery(void);
            Real getHorizontalTexelOffset(void) { return 0.0; }               // No offset in GL
            Real getVerticalTexelOffset(void) { return 0.0; }                 // No offset in GL
            Real getMinimumDepthInputValue(void) { return -1.0f; }            // Range [-1.0f, 1.0f]
            Real getMaximumDepthInputValue(void) { return 1.0f; }             // Range [-1.0f, 1.0f]
            void registerThread() {}
            void unregisterThread() {}
            void preExtraThreadsStarted() {}
            void postExtraThreadsStarted() {}
            void setClipPlanesImpl(const Ogre::PlaneList& planeList) {}

            // ----------------------------------
            // GLES2RenderSystem specific members
            // ----------------------------------
            GLES2Context* _getMainContext() { return mMainContext; }
            void _unregisterContext(GLES2Context *context);
            void _switchContext(GLES2Context *context);
            void _oneTimeContextInitialization();
            void initialiseContext(RenderWindow* primary);
            void _setRenderTarget(RenderTarget *target);

            GLES2Support* getGLES2Support() { return mGLSupport; }
            GLint convertCompareFunction(CompareFunction func) const;
            GLint convertStencilOp(StencilOperation op, bool invert = false) const;

            void bindGpuProgram(GpuProgram* prg);
            void unbindGpuProgram(GpuProgramType gptype);
            void bindGpuProgramParameters(GpuProgramType gptype, GpuProgramParametersSharedPtr params, uint16 mask);
            void bindGpuProgramPassIterationParameters(GpuProgramType gptype);

            void _setSceneBlending( SceneBlendFactor sourceFactor, SceneBlendFactor destFactor, SceneBlendOperation op );
            void _setSeparateSceneBlending( SceneBlendFactor sourceFactor, SceneBlendFactor destFactor, SceneBlendFactor sourceFactorAlpha, SceneBlendFactor destFactorAlpha, SceneBlendOperation op, SceneBlendOperation alphaOp );
            void _setAlphaRejectSettings( CompareFunction func, unsigned char value, bool alphaToCoverage );
            unsigned int getDisplayMonitorCount() const;

            GLfloat _getCurrentAnisotropy(size_t unit);

            GLenum _getPolygonMode(void) { return mPolygonMode; }

            void _setSceneBlendingOperation(SceneBlendOperation op);
            void _setSeparateSceneBlendingOperation(SceneBlendOperation op, SceneBlendOperation alphaOp);

            void _bindGLBuffer(GLenum target, GLuint buffer);
            void _deleteGLBuffer(GLenum target, GLuint buffer);

            virtual void beginProfileEvent( const String &eventName );
            
            virtual void endProfileEvent( void );
            
            virtual void markProfileEvent( const String &eventName );
    };
}

#endif