绘制没有纹理或着色器的 OpenGLES 图元会导致错误

发布于 2024-12-26 18:30:57 字数 1122 浏览 1 评论 0原文

我正在尝试在 iPhone 游戏中绘制一个简单的盒子。

以下是呈现该框的代码：

- (void)render {
  const SHAPE_TYPE * shape = dynamic_cast<SHAPE_TYPE *>(fixture->GetShape());

  if (!shape)
    return;

  GLfloat vertices[shape->m_vertexCount][2];
  for (int i = 0; i < shape->m_vertexCount; ++i) {
    vertices[i][0] = shape->m_vertices[i].x;
    vertices[i][1] = shape->m_vertices[i].y;
  }

  glPushMatrix();
  glLoadIdentity();
  CHECK_GL_ERROR();
  glDisableClientState(GL_TEXTURE_COORD_ARRAY);
  CHECK_GL_ERROR();
  glDisableClientState(GL_COLOR_ARRAY);
  CHECK_GL_ERROR();
  glEnableClientState(GL_VERTEX_ARRAY);
  CHECK_GL_ERROR();

  glVertexPointer(2, GL_FLOAT, 0, vertices);
  glDrawArrays(GL_LINE_LOOP, 0, (GLsizei)shape->m_vertexCount);

  glDisableClientState(GL_VERTEX_ARRAY);
  glEnableClientState(GL_COLOR_ARRAY);
  glEnableClientState(GL_TEXTURE_COORD_ARRAY);

  glPopMatrix();

  CHECK_GL_ERROR();
}

我在第二个 CHECK_GL_ERROR 上收到错误错误是 OpenGL error 0x0502 in -[MyApp render] 97

除了您所看到的之外，我没有任何 opengl 设置。我认为这与 cocos2d 启用的某些状态有关，但不知道是哪一个。

原文

I'm trying to draw a simple box in my iPhone game.

Here is the code that renders the box:

- (void)render {
  const SHAPE_TYPE * shape = dynamic_cast<SHAPE_TYPE *>(fixture->GetShape());

  if (!shape)
    return;

  GLfloat vertices[shape->m_vertexCount][2];
  for (int i = 0; i < shape->m_vertexCount; ++i) {
    vertices[i][0] = shape->m_vertices[i].x;
    vertices[i][1] = shape->m_vertices[i].y;
  }

  glPushMatrix();
  glLoadIdentity();
  CHECK_GL_ERROR();
  glDisableClientState(GL_TEXTURE_COORD_ARRAY);
  CHECK_GL_ERROR();
  glDisableClientState(GL_COLOR_ARRAY);
  CHECK_GL_ERROR();
  glEnableClientState(GL_VERTEX_ARRAY);
  CHECK_GL_ERROR();

  glVertexPointer(2, GL_FLOAT, 0, vertices);
  glDrawArrays(GL_LINE_LOOP, 0, (GLsizei)shape->m_vertexCount);

  glDisableClientState(GL_VERTEX_ARRAY);
  glEnableClientState(GL_COLOR_ARRAY);
  glEnableClientState(GL_TEXTURE_COORD_ARRAY);

  glPopMatrix();

  CHECK_GL_ERROR();
}

I get an error on the second CHECK_GL_ERROR
The error is OpenGL error 0x0502 in -[MyApp render] 97

I have no opengl setup besides what you see.
I think it has something to do with some state that cocos2d enables, no idea which one though.

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明媚如初 2025-01-02 18:30:57

尝试使用 ccDrawPoly：

ccDrawPoly(vertices, shape->m_vertexCount, YES);

另外，只需如果你使用的是 cocos2d 2.0，请保留请记住，您必须编写 OpenGL ES 2.0 代码。如果在 cocos2d 2.0 中没有 OpenGL 错误，您发布的代码将无法工作。

Try using ccDrawPoly:

ccDrawPoly(vertices, shape->m_vertexCount, YES);

Also, just in case you're on cocos2d 2.0 keep in mind that you'd have to write OpenGL ES 2.0 code. The code you posted will not work without OpenGL errors in cocos2d 2.0.

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