Box2d draw Line Help class in cocos2d-x

/* * Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com * * iPhone port by Simon Oliver - http://www.simonoliver.com - http://www.handcircus.com * * This software is provided 'as-is', without any express or implied * warranty.  In no event will the authors be held liable for any damages * arising from the use of this software. * Permission is granted to anyone to use this software for any purpose, * including commercial applications, and to alter it and redistribute it * freely, subject to the following restrictions: * 1. The origin of this software must not be misrepresented; you must not * claim that you wrote the original software. If you use this software * in a product, an acknowledgment in the product documentation would be * appreciated but is not required. * 2. Altered source versions must be plainly marked as such, and must not be * misrepresented as being the original software. * 3. This notice may not be removed or altered from any source distribution. *///// File modified for cocos2d integration// http://www.cocos2d-iphone.org//#ifndef GLES_RENDER_H#define GLES_RENDER_H#include "Box2D/Box2D.h"#include "cocos2d.h"struct b2AABB;// This class implements debug drawing callbacks that are invoked// inside b2World::Step.class GLESDebugDraw : public b2Draw{float32 mRatio;cocos2d::GLProgram *mShaderProgram;GLintmColorLocation;    void initShader( void );public:GLESDebugDraw();    GLESDebugDraw( float32 ratio );    void DrawPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color);    void DrawSolidPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color);    void DrawCircle(const b2Vec2& center, float32 radius, const b2Color& color);    void DrawSolidCircle(const b2Vec2& center, float32 radius, const b2Vec2& axis, const b2Color& color);    void DrawSegment(const b2Vec2& p1, const b2Vec2& p2, const b2Color& color);    void DrawTransform(const b2Transform& xf);        void DrawPoint(const b2Vec2& p, float32 size, const b2Color& color);        void DrawString(int x, int y, const char* string, ...);        void DrawAABB(b2AABB* aabb, const b2Color& color);};#endif // GLES_RENDER_H

#include "cocos2d.h"#include 
 
  #include 
  
   #include 
   
    USING_NS_CC;GLESDebugDraw::GLESDebugDraw(): mRatio( 1.0f ){this->initShader();}GLESDebugDraw::GLESDebugDraw( float32 ratio ): mRatio( ratio ){this->initShader();}void GLESDebugDraw::initShader( void ){mShaderProgram = ShaderCache::getInstance()->getProgram(GLProgram::SHADER_NAME_POSITION_U_COLOR);mColorLocation = glGetUniformLocation( mShaderProgram->getProgram(), "u_color");}void GLESDebugDraw::DrawPolygon(const b2Vec2* old_vertices, int32 vertexCount, const b2Color& color){mShaderProgram->use();mShaderProgram->setUniformsForBuiltins();b2Vec2* vertices = new b2Vec2[vertexCount];for( int i=0;i
    
     setUniformLocationWith4f(mColorLocation, color.r, color.g, color.b, 1);glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);glDrawArrays(GL_LINE_LOOP, 0, vertexCount);CC_INCREMENT_GL_DRAWS(1);CHECK_GL_ERROR_DEBUG();delete[] vertices;}void GLESDebugDraw::DrawSolidPolygon(const b2Vec2* old_vertices, int32 vertexCount, const b2Color& color){mShaderProgram->use();mShaderProgram->setUniformsForBuiltins();b2Vec2* vertices = new b2Vec2[vertexCount];for( int i=0;i
     
      setUniformLocationWith4f(mColorLocation, color.r*0.5f, color.g*0.5f, color.b*0.5f, 0.5f);glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);glDrawArrays(GL_TRIANGLE_FAN, 0, vertexCount);mShaderProgram->setUniformLocationWith4f(mColorLocation, color.r, color.g, color.b, 1);glDrawArrays(GL_LINE_LOOP, 0, vertexCount);CC_INCREMENT_GL_DRAWS(2);CHECK_GL_ERROR_DEBUG();delete[] vertices;}void GLESDebugDraw::DrawCircle(const b2Vec2& center, float32 radius, const b2Color& color){mShaderProgram->use();mShaderProgram->setUniformsForBuiltins();const float32 k_segments = 16.0f;int vertexCount=16;const float32 k_increment = 2.0f * b2_pi / k_segments;float32 theta = 0.0f;GLfloat*    glVertices = new GLfloat[vertexCount*2];for (int i = 0; i < k_segments; ++i){b2Vec2 v = center + radius * b2Vec2(cosf(theta), sinf(theta));glVertices[i*2]=v.x * mRatio;glVertices[i*2+1]=v.y * mRatio;theta += k_increment;}mShaderProgram->setUniformLocationWith4f(mColorLocation, color.r, color.g, color.b, 1);glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, glVertices);glDrawArrays(GL_LINE_LOOP, 0, vertexCount);CC_INCREMENT_GL_DRAWS(1);CHECK_GL_ERROR_DEBUG();delete[] glVertices;}void GLESDebugDraw::DrawSolidCircle(const b2Vec2& center, float32 radius, const b2Vec2& axis, const b2Color& color){mShaderProgram->use();mShaderProgram->setUniformsForBuiltins();const float32 k_segments = 16.0f;int vertexCount=16;const float32 k_increment = 2.0f * b2_pi / k_segments;float32 theta = 0.0f;GLfloat*    glVertices = new GLfloat[vertexCount*2];for (int i = 0; i < k_segments; ++i){b2Vec2 v = center + radius * b2Vec2(cosf(theta), sinf(theta));glVertices[i*2]=v.x * mRatio;glVertices[i*2+1]=v.y * mRatio;theta += k_increment;}mShaderProgram->setUniformLocationWith4f(mColorLocation, color.r*0.5f, color.g*0.5f, color.b*0.5f, 0.5f);glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, glVertices);glDrawArrays(GL_TRIANGLE_FAN, 0, vertexCount);mShaderProgram->setUniformLocationWith4f(mColorLocation, color.r, color.g, color.b, 1);glDrawArrays(GL_LINE_LOOP, 0, vertexCount);// Draw the axis lineDrawSegment(center,center+radius*axis,color);CC_INCREMENT_GL_DRAWS(2);CHECK_GL_ERROR_DEBUG();delete[] glVertices;}void GLESDebugDraw::DrawSegment(const b2Vec2& p1, const b2Vec2& p2, const b2Color& color){mShaderProgram->use();mShaderProgram->setUniformsForBuiltins();mShaderProgram->setUniformLocationWith4f(mColorLocation, color.r, color.g, color.b, 1);GLfloat    glVertices[] = {p1.x * mRatio, p1.y * mRatio,p2.x * mRatio, p2.y * mRatio};glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, glVertices);glDrawArrays(GL_LINES, 0, 2);CC_INCREMENT_GL_DRAWS(1);CHECK_GL_ERROR_DEBUG();}void GLESDebugDraw::DrawTransform(const b2Transform& xf){b2Vec2 p1 = xf.p, p2;const float32 k_axisScale = 0.4f;p2 = p1 + k_axisScale * xf.q.GetXAxis();DrawSegment(p1, p2, b2Color(1,0,0));    p2 = p1 + k_axisScale * xf.q.GetYAxis();DrawSegment(p1,p2,b2Color(0,1,0));}void GLESDebugDraw::DrawPoint(const b2Vec2& p, float32 size, const b2Color& color){mShaderProgram->use();mShaderProgram->setUniformsForBuiltins();mShaderProgram->setUniformLocationWith4f(mColorLocation, color.r, color.g, color.b, 1);//    glPointSize(size);GLfloat                glVertices[] = {p.x * mRatio, p.y * mRatio};glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, glVertices);glDrawArrays(GL_POINTS, 0, 1);//    glPointSize(1.0f);CC_INCREMENT_GL_DRAWS(1);CHECK_GL_ERROR_DEBUG();}void GLESDebugDraw::DrawString(int x, int y, const char *string, ...){//NSLog(@"DrawString: unsupported: %s", string);//printf(string);/* Unsupported as yet. Could replace with bitmap font renderer at a later date */}void GLESDebugDraw::DrawAABB(b2AABB* aabb, const b2Color& color){mShaderProgram->use();mShaderProgram->setUniformsForBuiltins();mShaderProgram->setUniformLocationWith4f(mColorLocation, color.r, color.g, color.b, 1);GLfloat                glVertices[] = {aabb->lowerBound.x * mRatio, aabb->lowerBound.y * mRatio,aabb->upperBound.x * mRatio, aabb->lowerBound.y * mRatio,aabb->upperBound.x * mRatio, aabb->upperBound.y * mRatio,aabb->lowerBound.x * mRatio, aabb->upperBound.y * mRatio};glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, glVertices);glDrawArrays(GL_LINE_LOOP, 0, 8);CC_INCREMENT_GL_DRAWS(1);CHECK_GL_ERROR_DEBUG();}