@Override
public void close() {
super.close();
program.close();
gl.glDeleteBuffers(2, new int[] {verticesId, elementsId}, 0);
gl.checkError("UniformQuadBatch close");
}
@Override
public void begin(float fbufWidth, float fbufHeight, boolean flip) {
super.begin(fbufWidth, fbufHeight, flip);
program.activate();
// TODO: apparently we can avoid glUniform calls because they're part of the program state; so
// we can cache the last set values for all these glUniform calls and only set them anew if
// they differ...
gl.glUniform2f(uHScreenSize, fbufWidth / 2f, fbufHeight / 2f);
gl.glUniform1f(uFlip, flip ? -1 : 1);
gl.glBindBuffer(GL_ARRAY_BUFFER, verticesId);
gl.glEnableVertexAttribArray(aVertex);
gl.glVertexAttribPointer(aVertex, VERTEX_SIZE, GL_SHORT, false, 0, 0);
gl.glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementsId);
gl.glActiveTexture(GL_TEXTURE0);
gl.glUniform1i(uTexture, 0);
gl.checkError("UniformQuadBatch begin");
}
/** Creates a uniform quad batch with the supplied custom shader program builder. */
public UniformQuadBatch(GL20 gl, Source source) {
super(gl);
int maxVecs = usableMaxUniformVectors(gl) - extraVec4s();
if (maxVecs < vec4sPerQuad())
throw new RuntimeException(
"GL_MAX_VERTEX_UNIFORM_VECTORS too low: have "
+ maxVecs
+ ", need at least "
+ vec4sPerQuad());
maxQuads = maxVecs / vec4sPerQuad();
program = new GLProgram(gl, source.vertex(this), source.fragment());
uTexture = program.getUniformLocation("u_Texture");
uHScreenSize = program.getUniformLocation("u_HScreenSize");
uFlip = program.getUniformLocation("u_Flip");
uData = program.getUniformLocation("u_Data");
aVertex = program.getAttribLocation("a_Vertex");
// create our stock supply of unit quads and stuff them into our buffers
short[] verts = new short[maxQuads * VERTICES_PER_QUAD * VERTEX_SIZE];
short[] elems = new short[maxQuads * ELEMENTS_PER_QUAD];
int vv = 0, ee = 0;
for (short ii = 0; ii < maxQuads; ii++) {
verts[vv++] = 0;
verts[vv++] = 0;
verts[vv++] = ii;
verts[vv++] = 1;
verts[vv++] = 0;
verts[vv++] = ii;
verts[vv++] = 0;
verts[vv++] = 1;
verts[vv++] = ii;
verts[vv++] = 1;
verts[vv++] = 1;
verts[vv++] = ii;
short base = (short) (ii * VERTICES_PER_QUAD);
short base0 = base, base1 = ++base, base2 = ++base, base3 = ++base;
elems[ee++] = base0;
elems[ee++] = base1;
elems[ee++] = base2;
elems[ee++] = base1;
elems[ee++] = base3;
elems[ee++] = base2;
}
data = new float[maxQuads * vec4sPerQuad() * 4];
// create our GL buffers
int[] ids = new int[2];
gl.glGenBuffers(2, ids, 0);
verticesId = ids[0];
elementsId = ids[1];
gl.glBindBuffer(GL_ARRAY_BUFFER, verticesId);
gl.bufs.setShortBuffer(verts, 0, verts.length);
gl.glBufferData(GL_ARRAY_BUFFER, verts.length * 2, gl.bufs.shortBuffer, GL_STATIC_DRAW);
gl.glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementsId);
gl.bufs.setShortBuffer(elems, 0, elems.length);
gl.glBufferData(GL_ELEMENT_ARRAY_BUFFER, elems.length * 2, gl.bufs.shortBuffer, GL_STATIC_DRAW);
gl.checkError("UniformQuadBatch end ctor");
}