OpenGL issues - use of undeclared identifiers

cocos2d-x C++
#1

Hi,

I am trying to convert the example here from ObjectiveC to C*+ but I am running into some problems, the following code gives me issues:
Link: http://www.raywenderlich.com/3857/how-to-create-dynamic-textures-with-ccrendertexture
I added a* sign before each line that tell’s me I am missing a reference:

glDisable(GL_TEXTURE_2D);

  • glDisableClientState(GL_TEXTURE_COORD_ARRAY);

float gradientAlpha = 0.7;
CCPoint vertices[4];
ccColor4F colors[4];
int nVertices = 0;

vertices[nVertices] = CCPointMake(0, 0);
colors[nVertices**] = ;
vertices[nVertices] = CCPointMake;
colors[nVertices**] = (ccColor4F){0, 0, 0, 0};
vertices[nVertices] = CCPointMake(0, textureSize);
colors[nVertices**] = ;
vertices[nVertices] = CCPointMake;
colors[nVertices**] = (ccColor4F){0, 0, 0, gradientAlpha};

  • glVertexPointer(2, GL_FLOAT, 0, vertices);
  • glColorPointer(4, GL_FLOAT, 0, colors);

glDrawArrays(GL_TRIANGLE_STRIP, 0, (GLsizei)nVertices);

  • glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    glEnable(GL_TEXTURE_2D);

I tried #include “CCGL.h” but that didn’t solve it and I got the latest from GitHub as well which also didn’t solve it.

The API calls that I am using here are from OpenGLES 1.0 and I assume my code automatically uses 2.0, I think I rather make it work in 2.0 then figure out how to use 1.0

I know this must be easy to fix, but so far I haven’t been able to extract the answer from Google yet.

-Mark

#2

Ok,

I am silly, the comments area in the last comment it shows the solution.

Sorry

#3

Hi there!

Did you converted the tutorial with success?

I’m trying to convert it too, but i’m having problems rendering the gradients and stripes.

I will write here my code for “spriteWithColor” method…

CCSprite* HelloWorld::sprite(cocos2d::ccColor4F bgColor, float textureSize)
{
    CCRenderTexture *rt = CCRenderTexture::create(textureSize, textureSize);

    rt->beginWithClear(bgColor.r, bgColor.g, bgColor.b, bgColor.a);

    //gradient
    float gradientAlpha = 0.7;
    CCPoint vertices[4];
    ccColor4F colors[4];
    int nVertices = 0;

    vertices[nVertices] = CCPointMake(0, 0);
    colors[nVertices++] = (ccColor4F){0, 0, 0, 0 };
    vertices[nVertices] = CCPointMake(textureSize, 0);
    colors[nVertices++] = (ccColor4F){0, 0, 0, 0};
    vertices[nVertices] = CCPointMake(0, textureSize);
    colors[nVertices++] = (ccColor4F){0, 0, 0, gradientAlpha};
    vertices[nVertices] = CCPointMake(textureSize, textureSize);
    colors[nVertices++] = (ccColor4F){0, 0, 0, gradientAlpha};

    CC_NODE_DRAW_SETUP();
    ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position | kCCVertexAttribFlag_Color );
    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
    glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_FLOAT, GL_FALSE, 0, colors);
    glBlendFunc(CC_BLEND_SRC, CC_BLEND_DST);
    glDrawArrays(GL_TRIANGLE_STRIP, 0, (GLsizei)nVertices);

    //noise
    CCSprite *noise = CCSprite::create("Noise.png");
    noise->setBlendFunc((ccBlendFunc){ GL_DST_COLOR, GL_ZERO });
    noise->setPosition(ccp(textureSize/2, textureSize/2));
    noise->visit();

    rt->end();

    return CCSprite::createWithTexture(rt->getSprite()->getTexture());
}

Can you or anyone help me with this?

Thank you

#4

Hey, did you manage to do that? I have the same problem. Even now, after 4 years I can’t find any solution