override fun onDrawFrame(gl: GL10?) surfaceTexture.updateTexImage() GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT) GLES20.glUseProgram(program) drawQuad()
For or full‑frame interlaced – adjust coordinate sampling. 4. Android Renderer Class (Kotlin) class AnaglyphRenderer : GLSurfaceView.Renderer private var textureId = 0 private var program = 0 private lateinit var surfaceTexture: SurfaceTexture private var videoWidth = 0 private var videoHeight = 0 override fun onSurfaceCreated(gl: GL10?, config: EGLConfig?) program = createProgram(vertexShader, fragmentShader) textureId = generateTexture() surfaceTexture = SurfaceTexture(textureId)
private fun generateTexture(): Int // ... generate GL_TEXTURE_EXTERNAL_OES texture
// Dubois anaglyph red-cyan coefficients float r = left.r * 0.437 + left.g * 0.449 + left.b * 0.164; float g = right.r * 0.062 + right.g * 0.354 + right.b * 0.207; float b = right.r * 0.011 + right.g * 0.101 + right.b * 0.142; anaglyph 3d video player for android
The renderer’s SurfaceTexture feeds frames to the shader. Add a setting in UI:
// Anaglyph fragment shader – Dubois optimized matrix precision mediump float; uniform sampler2D uTexture; // frame from video varying vec2 vTexCoord; void main() vec4 color = texture2D(uTexture, vTexCoord);
gl_FragColor = vec4(r, g, b, 1.0);
vec4 left = texture2D(uTexture, leftCoord); vec4 right = texture2D(uTexture, rightCoord);
fun getSurfaceTexture(): SurfaceTexture = surfaceTexture
val mediaPlayer = MediaPlayer().apply setDataSource(videoPath) setSurface(Surface(renderer.getSurfaceTexture())) prepare() start() override fun onDrawFrame(gl: GL10
// Assuming side-by-side: left half = left eye, right half = right eye vec2 leftCoord = vec2(vTexCoord.x * 0.5, vTexCoord.y); vec2 rightCoord = vec2(vTexCoord.x * 0.5 + 0.5, vTexCoord.y);
| Format | Sampling logic in shader | |------------------|-------------------------------------------------| | Side‑by‑side | leftCoord.x = vTexCoord.x / 2 | | Over‑under | leftCoord.y = vTexCoord.y / 2 | | Full‑frame left/right | Use separate textures if available |
override fun onSurfaceChanged(gl: GL10?, width: Int, height: Int) GLES20.glViewport(0, 0, width, height) uniform sampler2D uTexture