使用CCRenderTexture填充具有紋理/顏色的多邊形

Question

我有一個凹多邊形。我做的第一件事就是對它進行三角化並將所有三角形點存儲在一個頂點數組中。 我試圖用紋理或顏色填充該多邊形，但這兩種解決方案都不起作用。

這裏是試圖獲得一個紋理用一種顏色時，代碼：

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(); 

}

而另外一個用256 * 256無縫紋理：

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(); 
} 

最後我在這段代碼中調用了這些函數，rockPolygon是原始精靈：

//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 

我檢查了三角測量，它工作正常。我還刪除了renderTexture-> beginWithClear（1，1，1，0）之間的所有代碼;和renderTexture-> end（），將alpha通道設置爲1 beginWithClear（1，1，1，1），並且白色方塊正確顯示。所以我想這個問題來自於opengl調用，但我找不到什麼錯誤。你對如何解決這個問題有什麼想法嗎？

Answer 1

你已經在cocos2d 2.x.你的三角形凸出形狀的作品。然後你可以用CCDrawNode繪製形狀，不需要編寫你自己的渲染代碼。