(OpenGL iOS) 在 X 和 Y 坐标中移动时，原始形状 (2D) 扭曲 (GL_TRIANGLE_STRIP)

发布于 2024-12-28 23:03:17 字数 828 浏览 2 评论 0原文

当我通过 x 和 y 坐标移动图元时，我得到了这个奇怪的扭曲的图元形状（而不是正方形）。

这是一个快照： http://img535.imageshack.us/img535/9046/screenshot20120126at122.png

我正在使用正交投影，因为我想以 2D 渲染。

这是渲染代码：

//vertex definition
static GLfloat qdt[] = {
    30.0f, 60.0f, -0.03f,
    30.0f, 30.0f, -0.03f,
    60.0f, 60.0f, -0.03f,
    60.0f, 30.0f, -0.03f
};

//clear buffers
glClear(GL_COLOR_BUFFER_BIT);// also tried using GL_DEPTH_BUFFER_BIT

//load matrices
glLoadIdentity();

//drawing
glVertexPointer(3, GL_FLOAT, 0, &qdt[0]);
glColor4f(1.0f, 0.0f, 0.0f, 1.0f);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 12);

//swap buffers
[glContext presentRenderbuffer:GL_RENDERBUFFER_OES];

我也禁用了深度缓冲区。如果有人指出导致这种扭曲的错误，那就太好了。提前致谢。

原文

I get this strange distorted primitive shape (instead of a square) when i move the primitive through the x and y co-ordinates.

Here is a snapshot:
http://img535.imageshack.us/img535/9046/screenshot20120126at122.png

I'm using orthogonal projection since i want to render in 2D.

Here is the render code:

//vertex definition
static GLfloat qdt[] = {
    30.0f, 60.0f, -0.03f,
    30.0f, 30.0f, -0.03f,
    60.0f, 60.0f, -0.03f,
    60.0f, 30.0f, -0.03f
};

//clear buffers
glClear(GL_COLOR_BUFFER_BIT);// also tried using GL_DEPTH_BUFFER_BIT

//load matrices
glLoadIdentity();

//drawing
glVertexPointer(3, GL_FLOAT, 0, &qdt[0]);
glColor4f(1.0f, 0.0f, 0.0f, 1.0f);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 12);

//swap buffers
[glContext presentRenderbuffer:GL_RENDERBUFFER_OES];

I've disabled the depth buffers too.
It would be nice if someone points out the mistakes which is causing this distortion.
Thanks in advance.

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