public MainView(Context context) : base(context)
{
mRenderer = new MainRenderer(this);
SetEGLContextClientVersion(2);
SetRenderer(mRenderer);
this.RenderMode = Android.Opengl.Rendermode.WhenDirty;
}
/**
* Sets up the drawing object data for use in an OpenGL ES context.
*/
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 = MainRenderer.loadShader(GLES20.GlVertexShader, vertexShaderCode);
int fragmentShader = MainRenderer.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 MainView(Context context)
: base(context)
{
mRenderer = new MainRenderer(this);
SetEGLContextClientVersion(2);
SetRenderer(mRenderer);
this.RenderMode = Android.Opengl.Rendermode.WhenDirty;
}
/**
* Encapsulates the OpenGL ES instructions for drawing this shape.
*
* @param mvpMatrix - The Model View Project matrix in which to draw
* this shape.
*/
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");
MainRenderer.checkGlError("glGetUniformLocation");
// Apply the projection and view transformation
GLES20.GlUniformMatrix4fv(mMVPMatrixHandle, 1, false, mvpMatrix, 0);
MainRenderer.checkGlError("glUniformMatrix4fv");
// Draw the triangle
GLES20.GlDrawArrays(GLES20.GlTriangles, 0, vertexCount);
// Disable vertex array
GLES20.GlDisableVertexAttribArray(mPositionHandle);
}
