使用CCRenderTexture填充具有纹理/颜色的多边形

Question

我有一个凹多边形。我做的第一件事就是对它进行三角化并将所有三角形点存储在一个顶点数组中。 我试图用纹理或颜色填充该多边形，但这两种解决方案都不起作用。

这里是试图获得一个纹理用一种颜色时，代码：

CCTexture2D* TextureTest::textureColorWithVertices(CCPoint* vertices, 
                int count, 
                CCRect spriteRect) 
{ 
    CCRenderTexture *renderTexture = CCRenderTexture::create(spriteRect.size.width, spriteRect.size.height); 

    renderTexture->beginWithClear(1, 1, 1, 0); 

    mShaderProgram->use(); 
    mShaderProgram->setUniformForModelViewProjectionMatrix(); 

    ccVertex2F* verts = new ccVertex2F[count]; 
    for(int i=0;i<count;i++) { 
     verts[i].x = vertices[i].x + spriteRect.size.width/2;//*CC_CONTENT_SCALE_FACTOR(); 
     verts[i].y = vertices[i].y + spriteRect.size.height/2;//*CC_CONTENT_SCALE_FACTOR(); 
    } 

    ccColor4F* colors = new ccColor4F[count]; 
    ccColor4F red = ccc4f(1, 0, 0, 1); 
    for (int i = 0; i < count; i++) 
    { 
     colors[i] = red; 
    } 
    glDisable(GL_TEXTURE_2D); 
    mShaderProgram->setUniformLocationWith4f(mColorLocation, 1.0f, 1.0f, 1.0f, 1.0f); 

    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, verts); 
    glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_FLOAT, GL_FALSE, 0, colors); 
    glDrawArrays(GL_TRIANGLES, 0, count); 
    glEnable(GL_TEXTURE_2D); 

    CC_INCREMENT_GL_DRAWS(1); 
    delete[] colors; 
    delete[] verts; 


    renderTexture->end(); 

    return renderTexture->getSprite()->getTexture(); 

}

而另外一个用256 * 256无缝纹理：

CCTexture2D* TextureTest::textureWithVertices(CCPoint* vertices, 
              int count, 
              CCTexture2D* baseTexture, 
              CCRect spriteRect) 
{  
    CCRenderTexture *renderTexture = CCRenderTexture::create(spriteRect.size.width, spriteRect.size.height); 

    renderTexture->beginWithClear(1, 1, 1, 0); 

    mShaderProgram->use(); 
    mShaderProgram->setUniformForModelViewProjectionMatrix(); 

    ccVertex2F* verts = new ccVertex2F[count]; 
    for(int i=0;i<count;i++) 
    { 
     verts[i].x = vertices[i].x + spriteRect.size.width/2;//*CC_CONTENT_SCALE_FACTOR(); 
     verts[i].y = vertices[i].y + spriteRect.size.height/2;//*CC_CONTENT_SCALE_FACTOR(); 
    } 

    ccTex2F* uvs = new ccTex2F[count]; 
    float baseTexturePixelsWide = baseTexture->getPixelsWide(); 
    float baseTexturePixelsHigh = baseTexture->getPixelsHigh(); 
    for(int i=0;i<count;i++) 
    { 
     uvs[i].u = ((spriteRect.size.width/2 + vertices[i].x)/baseTexturePixelsWide) * CC_CONTENT_SCALE_FACTOR(); 
     uvs[i].v = ((spriteRect.size.height/2 - vertices[i].y)/baseTexturePixelsHigh) * CC_CONTENT_SCALE_FACTOR(); 
    } 

    ccGLBindTexture2D(baseTexture->getName()); 

    mShaderProgram->setUniformLocationWith4f(mColorLocation, 1.0f, 1.0f, 1.0f, 1.0f); 

    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, 0, uvs); 
    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, verts); 
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); 
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); 
    glDrawArrays(GL_TRIANGLES, 0, count); 


    CC_INCREMENT_GL_DRAWS(1); 
    delete[] uvs; 
    delete[] verts; 


    renderTexture->end(); 

    return renderTexture->getSprite()->getTexture(); 
} 

最后我在这段代码中调用了这些函数，rockPolygon是原始精灵：

//Get the seamless square texture 
    CCSpriteBatchNode* rockBatch = CCSpriteBatchNode::create("rock_small.png", kDefaultSpriteBatchCapacity); 
    //Triangulate the old sprite 
    vector<CCPoint> triangles = triangulateSprite(rockPolygon); 

    //CCTexture2D* rockTexture = textureColorWithVertices(&triangles[0], triangles.size(), rockPolygon->getOriginalRect()); 
    CCTexture2D* rockTexture = textureWithVertices(&triangles[0], triangles.size(), rockBatch->getTexture(), rockPolygon->getOriginalRect()); 
    CCSprite* genSprite = new CCSprite(); 
    genSprite->initWithTexture(rockTexture); 
    genSprite->setPosition(ccp(200,200)); 
    addChild(genSprite); //add generated sprite to main layer 

我检查了三角测量，它工作正常。我还删除了renderTexture-> beginWithClear（1，1，1，0）之间的所有代码;和renderTexture-> end（），将alpha通道设置为1 beginWithClear（1，1，1，1），并且白色方块正确显示。所以我想这个问题来自于opengl调用，但我找不到什么错误。你对如何解决这个问题有什么想法吗？

Answer 1

你已经在cocos2d 2.x.你的三角形凸出形状的作品。然后你可以用CCDrawNode绘制形状，不需要编写你自己的渲染代码。