public void OnDrawFrame(Javax.Microedition.Khronos.Opengles.IGL10 glUnused)
{
if (_updateSurface)
{
_surfaceTexture.UpdateTexImage();
_surfaceTexture.GetTransformMatrix(_STMatrix);
_updateSurface = false;
}
GLES20.GlUseProgram(0);
GLES20.GlUseProgram(_glProgram);
GLES20.GlActiveTexture(GLES20.GlTexture2);
var tWidth = _width;
var tHeight = _height;
funnyGhostEffectBuffer = ByteBuffer.AllocateDirect(tWidth * tHeight * 4);
funnyGhostEffectBuffer.Order(ByteOrder.NativeOrder());
funnyGhostEffectBuffer.Position(0);
// Note that it is read in GlReadPixels in a different pixel order than top-left to lower-right, so it adds a reversed+mirror effect
// when passed to TexImage2D to convert to texture.
GLES20.GlReadPixels(0, 0, tWidth - 1, tHeight - 1, GLES20.GlRgba, GLES20.GlUnsignedByte, funnyGhostEffectBuffer);
updateTargetTexture(tWidth, tHeight);
GLES20.GlBindTexture(GLES20.GlTexture2d, _otherTextureId);
GLES20.GlUniform1i(_otherTextureUniform, 2);
GLES20.GlUseProgram(0);
GLES20.GlUseProgram(_glProgram);
GLES20.GlActiveTexture(GLES20.GlTexture1);
GLES20.GlBindTexture(GLES11Ext.GlTextureExternalOes, _OESTextureId);
GLES20.GlUniform1i(_OESTextureUniform, 1);
_triangleVertices.Position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
GLES20.GlVertexAttribPointer(_aPositionHandle, 3, GLES20.GlFloat, false, TRIANGLE_VERTICES_DATA_STRIDE_BYTES, _triangleVertices);
GLES20.GlEnableVertexAttribArray(_aPositionHandle);
_textureVertices.Position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
GLES20.GlVertexAttribPointer(_aTextureCoord, 2, GLES20.GlFloat, false, TEXTURE_VERTICES_DATA_STRIDE_BYTES, _textureVertices);
GLES20.GlEnableVertexAttribArray(_aTextureCoord);
Android.Opengl.Matrix.SetIdentityM(_MVPMatrix, 0);
GLES20.GlUniformMatrix4fv(_uMVPMatrixHandle, 1, false, _MVPMatrix, 0);
GLES20.GlUniformMatrix4fv(_uSTMatrixHandle, 1, false, _STMatrix, 0);
GLES20.GlDrawArrays(GLES20.GlTriangleStrip, 0, 4);
GLES20.GlFinish();
}
public void drawFrame() {
checkGlError("onDrawFrame start");
mSurfaceTexture.GetTransformMatrix(mSTMatrix);
//GLES20.glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
//GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);
GLES20.GlUseProgram(mProgram);
checkGlError("glUseProgram");
GLES20.GlActiveTexture(GLES20.GlTexture0);
GLES20.GlBindTexture(GLES11Ext.GlTextureExternalOes, 0);
GLES20.GlBindTexture(GLES11Ext.GlTextureExternalOes, mTextureID);
mTriangleVertices.Position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
GLES20.GlVertexAttribPointer(maPositionHandle, 3, GLES20.GlFloat, false,
TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
checkGlError("glVertexAttribPointer maPosition");
GLES20.GlEnableVertexAttribArray(maPositionHandle);
checkGlError("glEnableVertexAttribArray maPositionHandle");
mTriangleVertices.Position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
GLES20.GlVertexAttribPointer(maTextureHandle, 2, GLES20.GlFloat, false,
TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
checkGlError("glVertexAttribPointer maTextureHandle");
GLES20.GlEnableVertexAttribArray(maTextureHandle);
checkGlError("glEnableVertexAttribArray maTextureHandle");
Android.Opengl.Matrix.SetIdentityM(mMVPMatrix, 0);
GLES20.GlUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
GLES20.GlUniformMatrix4fv(muSTMatrixHandle, 1, false, mSTMatrix, 0);
GLES20.GlDrawArrays(GLES20.GlTriangleStrip, 0, 4);
checkGlError("glDrawArrays");
GLES20.GlFinish();
}