Android click screen coordinates correspond to OpenGL ES coordinates
Simple application scenarios are as follows:
The user clicks on the screen, and a triangle is generated at the clicked position. The triangle of OpenGL ES is generated with three vertices, but the coordinate range of the vertices of OpenGL ES is [-1.0, 1.0]. There is a problem here. The location is mapped to the coordinates of OpenGL ES. In fact, the reason is very simple. It is to map the x-axis coordinates of the screen such as [0, 1080] to the range of [-1.0, 1.0]. There is a small problem here. If the screen is The size of 1080 * 1920, if you want to click on each position on the screen, you must map to OpenGL ES coordinates, because the x-axis and y-axis coordinates of OpenGL ES are both [- 1.0, 1.0], so if glViewport (0, 0, 1080, 1920), the range of orthogonal projection or perspective projection should be left = -ratio, right = ratio, bottom = -1, top = 1, where ratio = (float) width / height. The code is relatively simple, directly on the renderings and source code download link.
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