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 (GLES30.GlVertexShader,
vertexShaderCode);
int fragmentShader = MyGLRenderer.LoadShader (GLES30.GlFragmentShader,
fragmentShaderCode);
mProgram = GLES30.GlCreateProgram (); // create empty OpenGL Program
GLES30.GlAttachShader (mProgram, vertexShader); // add the vertex shader to program
GLES30.GlAttachShader (mProgram, fragmentShader); // add the fragment shader to program
GLES30.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(GLES30.GlVertexShader,
vertexShaderCode);
int fragmentShader = MyGLRenderer.LoadShader(GLES30.GlFragmentShader,
fragmentShaderCode);
mProgram = GLES30.GlCreateProgram(); // create empty OpenGL Program
GLES30.GlAttachShader(mProgram, vertexShader); // add the vertex shader to program
GLES30.GlAttachShader(mProgram, fragmentShader); // add the fragment shader to program
GLES30.GlLinkProgram(mProgram); // create OpenGL program executables
}
public MyGLSurfaceView(Context context) : base(context)
{
// Create an OpenGL ES 3.0 context.
SetEGLContextClientVersion(3);
// 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 3.0 context.
SetEGLContextClientVersion (3);
// 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
GLES30.GlUseProgram(mProgram);
// get handle to vertex shader's vPosition member
mPositionHandle = GLES30.GlGetAttribLocation(mProgram, "vPosition");
// Enable a handle to the triangle vertices
GLES30.GlEnableVertexAttribArray(mPositionHandle);
// Prepare the triangle coordinate data
GLES30.GlVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX,
GLES30.GlFloat, false,
vertexStride, vertexBuffer);
// get handle to fragment shader's vColor member
mColorHandle = GLES30.GlGetUniformLocation(mProgram, "vColor");
// Set color for drawing the triangle
GLES30.GlUniform4fv(mColorHandle, 1, color, 0);
// get handle to shape's transformation matrix
mMVPMatrixHandle = GLES30.GlGetUniformLocation(mProgram, "uMVPMatrix");
MyGLRenderer.CheckGlError("glGetUniformLocation");
// Apply the projection and view transformation
GLES30.GlUniformMatrix4fv(mMVPMatrixHandle, 1, false, mvpMatrix, 0);
MyGLRenderer.CheckGlError("glUniformMatrix4fv");
// Draw the square
GLES30.GlDrawElements(GLES30.GlTriangles, drawOrder.Length,
GLES30.GlUnsignedShort, drawListBuffer);
// Disable vertex array
GLES30.GlDisableVertexAttribArray(mPositionHandle);
}
