我在设备上绘制了一个纯白色的圆圈,但它会根据屏幕尺寸在整个设备上按比例拉伸。搜寻2D示例和可能的答案,我无法正确缩放它。
我的渲染器类:
@Override
public void onSurfaceChanged(GL10 gl, int width, int height)
{
float scaleX = (float) width / Screen.getScreenWidthPx();
float scaleY = (float) height / Screen.getScreenHeightPx();
final int vpWidth = (int)(Screen.getScreenWidthPx() * scaleX);
final int vpHeight = (int)(Screen.getScreenHeightPx() * scaleY);
GLES20.glViewport(0, 0, vpWidth, vpHeight);
mCam.setProjection(Screen.getScreenWidthPx(), Screen.getScreenHeightPx());
}
我的相机类别:
public void setProjection(float width, float height)
{
final float ratio = width / height;
Matrix.orthoM(mProjection, 0, 0, width, height, 0, -1, 1);
}
顶点着色器:
private String mVSCode =
"attribute vec4 vPosition;" +
"uniform float sWidth;" +
"uniform float sHeight;" +
"void main() {" +
"gl_Position = vPosition;" +
"}";
结果:
您必须通过顶点着色器中的正交投影矩阵来变换顶点坐标。
向顶点着色器添加矩阵统一(mat4 uProjection
)。通过mProjection
设置制服。将顶点坐标乘以顶点着色器中的uProjection
:
attribute vec4 vPosition;
uniform uProjection;
void main() {
gl_Position = uProjection* vPosition;
}