Displaying the camera stream on a GLSurfaceView via SurfaceTexture

Question

I\'m trying to display the camera stream in a GLSurfaceView via a SurfaceTexture trasmitted to OpenGL ES 2.0 shaders.

I took inspiration from this post.

The imag

Answer 1

I have used the SurfaceTexture succesfully to draw camera frames on a custom opengl texture without using the transformation matrix provided by android.

Just try defining your indices vertices and textures the way you would do it for a normal texture draw. Like this for example.

const GLfloat Vertices[] = {0.5, -0.5, 0,
                            0.5, 0.5, 0,
                           -0.5, 0.5, 0,
                           -0.5, -0.5, 0};

const GLubyte Indices[] = { 0, 1, 2,
                            2, 3, 0 };

const GLfloat Textures[] = { 1.,0.,
                             0.,0.,
                             0.,1.,
                             1.,1. };

You should be able to use the surfacetexture the way you use a normal texture.

In case you want to perform some sort of 3D projection, this is a good post on how to generate a proper MVP matrix. Which you could use to multiply with the position in the vertex shader.