public void destroy() {
if (mTextureHandles != null) {
GLES20.glDeleteTextures(mTextureHandles.length, mTextureHandles, 0);
GLUtil.checkGlError("Destroy picture");
mTextureHandles = null;
}
}
public void draw(float[] mvpMatrix, float alpha) {
if (!mHasContent) {
return;
}
// Add program to OpenGL ES environment
GLES20.glUseProgram(sProgramHandle);
// Apply the projection and view transformation
GLES20.glUniformMatrix4fv(sUniformMVPMatrixHandle, 1, false, mvpMatrix, 0);
GLUtil.checkGlError("glUniformMatrix4fv");
// Set up vertex buffer
GLES20.glEnableVertexAttribArray(sAttribPositionHandle);
GLES20.glVertexAttribPointer(
sAttribPositionHandle,
COORDS_PER_VERTEX,
GLES20.GL_FLOAT,
false,
VERTEX_STRIDE_BYTES,
mVertexBuffer);
// Set up texture stuff
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glUniform1i(sUniformTextureHandle, 0);
GLES20.glVertexAttribPointer(
sAttribTextureCoordsHandle,
COORDS_PER_TEXTURE_VERTEX,
GLES20.GL_FLOAT,
false,
TEXTURE_VERTEX_STRIDE_BYTES,
mTextureCoordsBuffer);
GLES20.glEnableVertexAttribArray(sAttribTextureCoordsHandle);
// Set the alpha
GLES20.glUniform1f(sUniformAlphaHandle, alpha);
// Draw tiles
for (int y = 0; y < mRows; y++) {
for (int x = 0; x < mCols; x++) {
// Pass in the vertex information
mVertices[0] =
mVertices[3] = mVertices[9] = Math.min(-1 + 2f * x * mTileSize / mWidth, 1); // left
mVertices[1] =
mVertices[10] =
mVertices[16] = Math.min(-1 + 2f * (y + 1) * mTileSize / mHeight, 1); // top
mVertices[6] =
mVertices[12] =
mVertices[15] = Math.min(-1 + 2f * (x + 1) * mTileSize / mWidth, 1); // right
mVertices[4] =
mVertices[7] = mVertices[13] = Math.min(-1 + 2f * y * mTileSize / mHeight, 1); // bottom
mVertexBuffer.put(mVertices);
mVertexBuffer.position(0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureHandles[y * mCols + x]);
GLUtil.checkGlError("glBindTexture");
// Draw the two triangles
GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, mVertices.length / COORDS_PER_VERTEX);
}
}
GLES20.glDisableVertexAttribArray(sAttribPositionHandle);
GLES20.glDisableVertexAttribArray(sAttribTextureCoordsHandle);
}
