@Override
public void draw(
float[] mMVPMatrix, float[] mRotationMatrix, float[] mvMatrix, float[] mProjMatrix) {
if (visible && canvasSurfaceCreated()) {
if (!initialized) {
if (!initObject()) {
return;
}
}
// Add program to OpenGL environment
GLES20.glUseProgram(programHandle);
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureDataHandle);
GLES20.glUniform1i(textureUniformHandle, 0);
// Enable a handle to the triangle vertices
// Prepare the triangle coordinate data
vBuffer.position(0);
GLES20.glVertexAttribPointer(
positionHandle, COORDS_PER_VERTEX, GLES20.GL_FLOAT, false, vertexStride, vBuffer);
GLES20.glEnableVertexAttribArray(positionHandle);
// Pass in the texture coordinate information
textureBuffer.position(0);
GLES20.glVertexAttribPointer(
textureCoordinateHandle,
COORDS_PER_TEXTURE,
GLES20.GL_FLOAT,
false,
(COORDS_PER_TEXTURE * 4),
textureBuffer);
GLES20.glEnableVertexAttribArray(textureCoordinateHandle);
Matrix.multiplyMM(mMVPMatrix, 0, mvMatrix, 0, mModelMatrix, 0);
// Apply the projection and view transformation
GLES20.glUniformMatrix4fv(mModelMatrixHandle, 1, false, mMVPMatrix, 0);
GLES20Renderer.checkGLError("glUniformMatrix4fv");
Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0);
GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, mMVPMatrix, 0);
GLES20Renderer.checkGLError("glUniformMatrix4fv");
// Draw the square
GLES20.glDrawElements(
GLES20.GL_TRIANGLES, drawOrder.length, GLES20.GL_UNSIGNED_SHORT, drawBuffer);
// Disable vertex array
// GLES20.glDisableVertexAttribArray(positionHandle);
}
}
@Override
public boolean initObject() {
if (imageResId != 0) {
vertexCount = coordinates.length / COORDS_PER_VERTEX;
ByteBuffer buff = ByteBuffer.allocateDirect(coordinates.length * 4);
buff.order(ByteOrder.nativeOrder());
vBuffer = buff.asFloatBuffer();
vBuffer.put(coordinates);
vBuffer.position(0);
ByteBuffer drawBuff = ByteBuffer.allocateDirect(drawOrder.length * 2);
drawBuff.order(ByteOrder.nativeOrder());
drawBuffer = drawBuff.asShortBuffer();
drawBuffer.put(drawOrder);
drawBuffer.position(0);
ByteBuffer textBuff = ByteBuffer.allocateDirect(textureCoordinates.length * 4);
textBuff.order(ByteOrder.nativeOrder());
textureBuffer = textBuff.asFloatBuffer();
textureBuffer.put(textureCoordinates);
textureBuffer.position(0);
// Prepare shaders and OpenGL program
vertexShaderHandle = loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode);
fragShaderHandle = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);
programHandle = GLES20.glCreateProgram(); // create empty OpenGL Program
GLES20.glAttachShader(programHandle, vertexShaderHandle); // add the vertex shader to program
GLES20.glAttachShader(programHandle, fragShaderHandle); // add the fragment shader to program
GLES20.glBindAttribLocation(programHandle, 0, "aPosition");
GLES20.glBindAttribLocation(programHandle, 1, "aTexCoordinate");
GLES20.glLinkProgram(programHandle); // create OpenGL program executables
final int[] status = new int[1];
GLES20.glGetProgramiv(programHandle, GLES20.GL_LINK_STATUS, status, 0);
if (status[0] == 0) {
Log.e(
"GLSprite",
"Error compiling OpenGL program: " + GLES20.glGetProgramInfoLog(programHandle));
GLES20.glDeleteProgram(programHandle);
programHandle = 0;
throw new RuntimeException("Error creating OpenGL program.");
}
textureDataHandle = GLUtil.loadTexture(mCanvas.getView().getContext(), imageResId);
// get handle to vertex shader's aPosition member
positionHandle = GLES20.glGetAttribLocation(programHandle, "aPosition");
textureCoordinateHandle = GLES20.glGetAttribLocation(programHandle, "aTexCoordinate");
mModelMatrixHandle = GLES20.glGetUniformLocation(programHandle, "uMVMatrix");
GLES20Renderer.checkGLError("glUniformLocation uMVMatrix");
mMVPMatrixHandle = GLES20.glGetUniformLocation(programHandle, "uMVPMatrix");
GLES20Renderer.checkGLError("glUniformLocation uMVPMatrix");
textureUniformHandle = GLES20.glGetUniformLocation(programHandle, "u_Texture");
GLES20Renderer.checkGLError("glUniformLocation u_Texture");
GLES20.glEnable(GLES20.GL_BLEND);
GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
initialized = true;
return true;
} else {
return false;
}
}
