public void onDrawFrame(GL10 glUnused)
{
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
// Do a complete rotation every 10 seconds.
long time = SystemClock.uptimeMillis() % 10000L;
float angleInDegrees = (360.0f / 10000.0f) * ((int)time);
// Set our per-vertex lighting program.
gl.useProgram(mPerVertexProgramHandle);
// Set program handles for cube drawing.
mMVPMatrixHandle = gl.getUniformLocation(mPerVertexProgramHandle, "u_MVPMatrix");
mMVMatrixHandle = gl.getUniformLocation(mPerVertexProgramHandle, "u_MVMatrix");
mLightPosHandle = gl.getUniformLocation(mPerVertexProgramHandle, "u_LightPos");
mPositionHandle = gl.getAttribLocation(mPerVertexProgramHandle, "a_Position");
mColorHandle = gl.getAttribLocation(mPerVertexProgramHandle, "a_Color");
mNormalHandle = gl.getAttribLocation(mPerVertexProgramHandle, "a_Normal");
// Calculate position of the light. Rotate and then push into the distance.
Matrix.setIdentityM(mLightModelMatrix, 0);
Matrix.translateM(mLightModelMatrix, 0, 0.0f, 0.0f, -5.0f);
Matrix.rotateM(mLightModelMatrix, 0, angleInDegrees, 0.0f, 1.0f, 0.0f);
Matrix.translateM(mLightModelMatrix, 0, 0.0f, 0.0f, 2.0f);
Matrix.multiplyMV(mLightPosInWorldSpace, 0, mLightModelMatrix, 0, mLightPosInModelSpace, 0);
Matrix.multiplyMV(mLightPosInEyeSpace, 0, mViewMatrix, 0, mLightPosInWorldSpace, 0);
#region drawCube
Action drawCube =
delegate
{
// Pass in the position information
mCubePositions.position(0);
opengl.glVertexAttribPointer(mPositionHandle, mPositionDataSize, (int)gl.FLOAT, false,
0, mCubePositions);
gl.enableVertexAttribArray((uint)mPositionHandle);
// Pass in the color information
mCubeColors.position(0);
opengl.glVertexAttribPointer(mColorHandle, mColorDataSize, (int)gl.FLOAT, false,
0, mCubeColors);
gl.enableVertexAttribArray((uint)mColorHandle);
// Pass in the normal information
mCubeNormals.position(0);
opengl.glVertexAttribPointer(mNormalHandle, mNormalDataSize, (int)gl.FLOAT, false,
0, mCubeNormals);
gl.enableVertexAttribArray((uint)mNormalHandle);
// This multiplies the view matrix by the model matrix, and stores the result in the MVP matrix
// (which currently contains model * view).
Matrix.multiplyMM(mMVPMatrix, 0, mViewMatrix, 0, mModelMatrix, 0);
// Pass in the modelview matrix.
gl.uniformMatrix4fv(mMVMatrixHandle, false, mMVPMatrix);
// This multiplies the modelview matrix by the projection matrix, and stores the result in the MVP matrix
// (which now contains model * view * projection).
Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mMVPMatrix, 0);
// Pass in the combined matrix.
gl.uniformMatrix4fv(mMVPMatrixHandle, false, mMVPMatrix);
// Pass in the light position in eye space.
gl.uniform3f(mLightPosHandle, mLightPosInEyeSpace[0], mLightPosInEyeSpace[1], mLightPosInEyeSpace[2]);
// Draw the cube.
gl.drawArrays(gl.TRIANGLES, 0, 36);
};
#endregion
// Draw some cubes.
Matrix.setIdentityM(mModelMatrix, 0);
Matrix.translateM(mModelMatrix, 0, 4.0f, 0.0f, -7.0f);
Matrix.rotateM(mModelMatrix, 0, angleInDegrees, 1.0f, 0.0f, 0.0f);
drawCube();
Matrix.setIdentityM(mModelMatrix, 0);
Matrix.translateM(mModelMatrix, 0, -4.0f, 0.0f, -7.0f);
Matrix.rotateM(mModelMatrix, 0, angleInDegrees, 0.0f, 1.0f, 0.0f);
drawCube();
Matrix.setIdentityM(mModelMatrix, 0);
Matrix.translateM(mModelMatrix, 0, 0.0f, 4.0f, -7.0f);
Matrix.rotateM(mModelMatrix, 0, angleInDegrees, 0.0f, 0.0f, 1.0f);
drawCube();
Matrix.setIdentityM(mModelMatrix, 0);
Matrix.translateM(mModelMatrix, 0, 0.0f, -4.0f, -7.0f);
drawCube();
Matrix.setIdentityM(mModelMatrix, 0);
Matrix.translateM(mModelMatrix, 0, 0.0f, 0.0f, -5.0f);
Matrix.rotateM(mModelMatrix, 0, angleInDegrees, 1.0f, 1.0f, 0.0f);
drawCube();
#region drawLight
Action drawLight =
delegate
{
var pointMVPMatrixHandle = gl.getUniformLocation(mPointProgramHandle, "u_MVPMatrix");
var pointPositionHandle = gl.getAttribLocation(mPointProgramHandle, "a_Position");
// Pass in the position.
gl.vertexAttrib3f((uint)pointPositionHandle, mLightPosInModelSpace[0], mLightPosInModelSpace[1], mLightPosInModelSpace[2]);
// Since we are not using a buffer object, disable vertex arrays for this attribute.
gl.disableVertexAttribArray((uint)pointPositionHandle);
// Pass in the transformation matrix.
Matrix.multiplyMM(mMVPMatrix, 0, mViewMatrix, 0, mLightModelMatrix, 0);
Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mMVPMatrix, 0);
gl.uniformMatrix4fv(pointMVPMatrixHandle, false, mMVPMatrix);
// Draw the point.
gl.drawArrays(gl.POINTS, 0, 1);
};
#endregion
// Draw a point to indicate the light.
gl.useProgram(mPointProgramHandle);
drawLight();
}