DebugRenderer.h

/*
 * Copyright (C) 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef DEBUGRENDERER_H
#define DEBUGRENDERER_H

#include "RendererCommon.h"
#include <vector>

class DebugRenderer {
public:
    DebugRenderer();
    ~DebugRenderer();

    const Matrix4& getProjectionMatrix() const { return mProjectionMatrix; }
    void setProjectionMatrix(const Matrix4& matrix);

    void queueLine(const Vector2& pos1, const Vector2& pos2, unsigned int colorRgba);
    void queuePolygon(const Vector2* points, int count, unsigned int colorRgba);
    void queueFilledPolygon(const Vector2* points, int count, unsigned int colorRgba);
    void queueCircle(const Vector2& center, float radius, int segments, unsigned int colorRgba);
    void queueFilledCircle(const Vector2& center, float radius, int segments,
            unsigned int colorRgba);

    void flush();
    void synchronizeForRendering();
    void render();
private:
    struct DebugVertex {
        Vector2 position = Vector2(0.0f, 0.0f);
        unsigned int color = 0x00000000;
    };
    struct DebugDraw {
        int count = 0;
        GLuint mode = GL_LINES;
    };

    DebugVertex* allocateVertices(int count, GLuint mode);
    void flushCurrentDraw();
    void createShader();
    Vector2 transformVertex(const Vector2& point);

    Matrix4 mProjectionMatrix = {
            1.0f, 0.0f, 0.0f, 0.0f,
            0.0f, 1.0f, 0.0f, 0.0f,
            0.0f, 0.0f, 1.0f, 0.0f,
            0.0f, 0.0f, 0.0f, 1.0f };
    bool mHasCurrentDraw = false;
    DebugDraw mCurrentDraw;
    std::vector<DebugVertex> mVertexBuffer;
    std::vector<DebugDraw> mDrawList;
    std::vector<DebugVertex> mRenderVertexBuffer;
    std::vector<DebugDraw> mRenderDrawList;
    MeshPtr mRenderMesh;
    MeshInstancePtr mRenderMeshInstance;
};

#endif // DEBUGRENDERER_H