I want to use OpenGL to process the data from camera which format is NV21 on Android platform.
My code was below:
vertex shader:
attribute vec4 position;
attribute vec2 inputTextureCoordinate;
varying vec2 v_texCoord;
void main()
{
gl_Position = position;
v_texCoord = inputTextureCoordinate;
}
fragment shader:
precision mediump float;
varying vec2 v_texCoord;
uniform sampler2D yTexture;
uniform sampler2D uvTexture;
const mat3 yuv2rgb = mat3(
1, 0, 1.2802,
1, -0.214821, -0.380589,
1, 2.127982, 0
);
void main() {
vec3 yuv = vec3(
1.1643 * (texture2D(yTexture, v_texCoord).r - 0.0627),
texture2D(uvTexture, v_texCoord).a - 0.5,
texture2D(uvTexture, v_texCoord).r - 0.5
);
vec3 rgb = yuv * yuv2rgb;
gl_FragColor = vec4(rgb, 1.0);
}
I send yTexture:
GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE, w, h, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, ByteBuffer.wrap(data));
where data was the nv21 format byte array of camera preview And I send uvTexture:
byte[] luminanceAlpha = new byte[w * h / 2];
System.arraycopy(data, w * h, luminanceAlpha, 0, w * h / 2);
GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE_ALPHA, w / 2, h / 2, 0, GLES20.GL_LUMINANCE_ALPHA, GLES20.GL_UNSIGNED_BYTE, ByteBuffer.wrap(luminanceAlpha));
That's all the code which I thought was important. But when I run the program, I found the result in GLSurfaceView looks more bluer. Is there any wrong with my code. I was very trouble.
