OpenSubdiv/examples/glBatchViewer/effect.h

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#ifndef EFFECT_H
#define EFFECT_H

#if defined(__APPLE__)
    #include "TargetConditionals.h"
    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
        #include <OpenGLES/ES2/gl.h>
    #else
        #include <OpenGL/gl3.h>
    #endif
#elif defined(ANDROID)
    #include <GLES2/gl2.h>
#else
    #if defined(_WIN32)
        #include <windows.h>
    #endif
    #include <GL/gl.h>
#endif

#include <osd/patch.h>
#include <osd/glDrawRegistry.h>

union EffectDesc {
public:
    struct {
        unsigned int wire:2;
        unsigned int screenSpaceTess:1;
    };
    int value;

    bool operator < (const EffectDesc &e) const {
        return value < e.value;
    }

    int GetWire() const { return wire; }
    bool GetScreenSpaceTess() const { return screenSpaceTess; }
};

struct MyDrawConfig : public OpenSubdiv::OsdGLDrawConfig {

    MyDrawConfig() : 
        diffuseColorUniform(-1) {}
    virtual ~MyDrawConfig() {}

    GLint diffuseColorUniform;
};

class MyEffect { // formerly EffectHandle
public:
    MyEffect() : displayPatchColor(false), screenSpaceTess(false), wire(0) {}

    EffectDesc GetEffectDescriptor() const {
        EffectDesc desc;

        desc.value = 0;
        desc.wire = wire;
        desc.screenSpaceTess = screenSpaceTess;

        return desc;
    }

    void BindDrawConfig(MyDrawConfig *config, OpenSubdiv::OsdDrawContext::PatchDescriptor desc);

    void SetMatrix(const float *modelview, const float *projection);
    void SetTessLevel(float tessLevel);
    void SetLighting();

    bool operator == (const MyEffect &other) const {
        return (displayPatchColor == other.displayPatchColor) and
               (screenSpaceTess == other.screenSpaceTess) and
               (wire == other.wire);
    }
    bool operator != (const MyEffect &other) const {
        return !(*this == other);
    }

    enum {
        kWire, kFill, kLine
    };

    bool displayPatchColor;  // runtime switchable
    bool screenSpaceTess;    // need recompile (should be considered in effect descriptor)
    int wire;                // need recompile
};


#endif  /* EFFECT_H */