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#ifndef QT3DRENDER_RENDER_GRAPHICSHELPERINTERFACE_H
#define QT3DRENDER_RENDER_GRAPHICSHELPERINTERFACE_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QOpenGLFunctions>
#include <QOpenGLTexture>
#include <QVector>
#include <Qt3DRenderer/private/shadervariables_p.h>

QT_BEGIN_NAMESPACE

namespace Qt3DRender {
namespace Render {

struct Attachment;

class GraphicsHelperInterface
{
public:
    enum Feature {
        MRT = 0,
        Tessellation,
        UniformBufferObject,
        BindableFragmentOutputs,
        PrimitiveRestart,
        RenderBufferDimensionRetrieval,
        TextureDimensionRetrieval
    };

    virtual ~GraphicsHelperInterface() {}
    virtual void    initializeHelper(QOpenGLContext *context, QAbstractOpenGLFunctions *functions) = 0;
    virtual void    drawElementsInstanced(GLenum primitiveType, GLsizei primitiveCount, GLint indexType, void * indices, GLsizei instances, GLint baseVertex = 0, GLint baseInstance = 0) = 0;
    virtual void    drawArraysInstanced(GLenum primitiveType, GLint first, GLsizei count, GLsizei instances) = 0;
    virtual void    drawElements(GLenum primitiveType, GLsizei primitiveCount, GLint indexType, void * indices, GLint baseVertex = 0) = 0;
    virtual void    drawArrays(GLenum primitiveType, GLint first, GLsizei count) = 0;
    virtual void    setVerticesPerPatch(GLint verticesPerPatch) = 0;
    virtual void    useProgram(GLuint programId) = 0;
    virtual QVector<ShaderUniform> programUniformsAndLocations(GLuint programId) = 0;
    virtual QVector<ShaderAttribute> programAttributesAndLocations(GLuint programId) = 0;
    virtual QVector<ShaderUniformBlock> programUniformBlocks(GLuint programId) = 0;
    virtual void    vertexAttribDivisor(GLuint index, GLuint divisor) = 0;
    virtual void    blendEquation(GLenum mode) = 0;
    virtual void    alphaTest(GLenum mode1, GLenum mode2) = 0;
    virtual void    depthTest(GLenum mode) = 0;
    virtual void    depthMask(GLenum mode) = 0;
    virtual void    cullFace(GLenum mode) = 0;
    virtual void    frontFace(GLenum mode) = 0;
    virtual void    enableAlphaCoverage() = 0;
    virtual void    disableAlphaCoverage() = 0;
    virtual GLuint  createFrameBufferObject() = 0;
    virtual void    releaseFrameBufferObject(GLuint frameBufferId) = 0;
    virtual void    bindFrameBufferObject(GLuint frameBufferId) = 0;
    virtual GLuint  boundFrameBufferObject() = 0;
    virtual bool    checkFrameBufferComplete() = 0;
    virtual void    bindFrameBufferAttachment(QOpenGLTexture *texture, const Attachment &attachment) = 0;
    virtual bool    supportsFeature(Feature feature) const = 0;
    virtual void    drawBuffers(GLsizei n, const int *bufs) = 0;
    virtual void    bindFragDataLocation(GLuint shader, const QHash<QString, int> &outputs) = 0;
    virtual void    bindUniform(const QVariant &v, const ShaderUniform &description) = 0;
    virtual void    bindUniformBlock(GLuint programId, GLuint uniformBlockIndex, GLuint uniformBlockBinding) = 0;
    virtual void    bindBufferBase(GLenum target, GLuint index, GLuint buffer) = 0;
    virtual void    buildUniformBuffer(const QVariant &v, const ShaderUniform &description, QByteArray &buffer) = 0;
    virtual uint    uniformByteSize(const ShaderUniform &description) = 0;
    virtual void    enableClipPlane(int clipPlane) = 0;
    virtual void    disableClipPlane(int clipPlane) = 0;
    virtual GLint   maxClipPlaneCount() = 0;
    virtual void    enablePrimitiveRestart(int primitiveRestartIndex) = 0;
    virtual void    disablePrimitiveRestart() = 0;
    virtual QSize   getRenderBufferDimensions(GLuint renderBufferId) = 0;
    virtual QSize   getTextureDimensions(GLuint textureId, GLenum target, uint level = 0) = 0;
};


} // namespace Render
} // namespace Qt3DRender

QT_END_NAMESPACE

#endif // QT3DRENDER_RENDER_GRAPHICSHELPERINTERFACE_H