public Triangle()
{
// initialize vertex byte buffer for shape coordinates
ByteBuffer bb = ByteBuffer.AllocateDirect(
// (number of coordinate values * 4 bytes per float)
triangleCoords.Length * 4);
// use the device hardware's native byte order
bb.Order(ByteOrder.NativeOrder());
// create a floating point buffer from the ByteBuffer
vertexBuffer = bb.AsFloatBuffer();
// add the coordinates to the FloatBuffer
vertexBuffer.Put(triangleCoords);
// set the buffer to read the first coordinate
vertexBuffer.Position(0);
// prepare shaders and OpenGL program
int vertexShader = MyGLRenderer.LoadShader(GLES20.GlVertexShader,
vertexShaderCode);
int fragmentShader = MyGLRenderer.LoadShader(GLES20.GlFragmentShader,
fragmentShaderCode);
mProgram = GLES20.GlCreateProgram(); // create empty OpenGL Program
GLES20.GlAttachShader(mProgram, vertexShader); // add the vertex shader to program
GLES20.GlAttachShader(mProgram, fragmentShader); // add the fragment shader to program
GLES20.GlLinkProgram(mProgram); // create OpenGL program executables
}
public Square()
{
// initialize vertex byte buffer for shape coordinates
ByteBuffer bb = ByteBuffer.AllocateDirect(
// (# of coordinate values * 4 bytes per float)
squareCoords.Length * 4);
bb.Order(ByteOrder.NativeOrder());
vertexBuffer = bb.AsFloatBuffer();
vertexBuffer.Put(squareCoords);
vertexBuffer.Position(0);
// initialize byte buffer for the draw list
ByteBuffer dlb = ByteBuffer.AllocateDirect(
// (# of coordinate values * 2 bytes per short)
drawOrder.Length * 2);
dlb.Order(ByteOrder.NativeOrder());
drawListBuffer = dlb.AsShortBuffer();
drawListBuffer.Put(drawOrder);
drawListBuffer.Position(0);
// prepare shaders and OpenGL program
int vertexShader = MyGLRenderer.LoadShader(GLES20.GlVertexShader,
vertexShaderCode);
int fragmentShader = MyGLRenderer.LoadShader(GLES20.GlFragmentShader,
fragmentShaderCode);
mProgram = GLES20.GlCreateProgram(); // create empty OpenGL Program
GLES20.GlAttachShader(mProgram, vertexShader); // add the vertex shader to program
GLES20.GlAttachShader(mProgram, fragmentShader); // add the fragment shader to program
GLES20.GlLinkProgram(mProgram); // create OpenGL program executables
}
public MyGLSurfaceView(Context context) : base(context)
{
// Create an OpenGL ES 2.0 context.
SetEGLContextClientVersion(2);
// Set the Renderer for drawing on the GLSurfaceView
mRenderer = new MyGLRenderer();
SetRenderer(mRenderer);
// Render the view only when there is a change in the drawing data
this.RenderMode = Rendermode.WhenDirty;
}
public MyGLSurfaceView (Context context) : base (context)
{
// Create an OpenGL ES 2.0 context.
SetEGLContextClientVersion (2);
// Set the Renderer for drawing on the GLSurfaceView
mRenderer = new MyGLRenderer ();
SetRenderer (mRenderer);
// Render the view only when there is a change in the drawing data
this.RenderMode = Rendermode.WhenDirty;
}
public void Draw(float[] mvpMatrix)
{
// Add program to OpenGL environment
GLES20.GlUseProgram(mProgram);
// get handle to vertex shader's vPosition member
mPositionHandle = GLES20.GlGetAttribLocation(mProgram, "vPosition");
// Enable a handle to the triangle vertices
GLES20.GlEnableVertexAttribArray(mPositionHandle);
// Prepare the triangle coordinate data
GLES20.GlVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX,
GLES20.GlFloat, false,
vertexStride, vertexBuffer);
// get handle to fragment shader's vColor member
mColorHandle = GLES20.GlGetUniformLocation(mProgram, "vColor");
// Set color for drawing the triangle
GLES20.GlUniform4fv(mColorHandle, 1, color, 0);
// get handle to shape's transformation matrix
mMVPMatrixHandle = GLES20.GlGetUniformLocation(mProgram, "uMVPMatrix");
MyGLRenderer.CheckGlError("glGetUniformLocation");
// Apply the projection and view transformation
GLES20.GlUniformMatrix4fv(mMVPMatrixHandle, 1, false, mvpMatrix, 0);
MyGLRenderer.CheckGlError("glUniformMatrix4fv");
// Draw the square
GLES20.GlDrawElements(GLES20.GlTriangles, drawOrder.Length,
GLES20.GlUnsignedShort, drawListBuffer);
// Disable vertex array
GLES20.GlDisableVertexAttribArray(mPositionHandle);
}