public final void doAccumulate(final float value) {
// TOMD - scissoring
// int x0 = gc.transform.clipX0;
// int x1 = gc.transform.clipX1;
// int y0 = gc.transform.clipY0;
// int y1 = gc.transform.clipY1;
final int width = gc.frameBuffer.width;
final int x0 = gc.state.viewport.x;
final int x1 = gc.state.viewport.width;
final int y0 = gc.state.viewport.y * width;
final int y1 = gc.state.viewport.height * width;
final int[] cfb = gc.frameBuffer.readBuffer.buffer;
final int[] localBuffer = buffer;
final boolean scale = value != 1.0f;
for (int x = x0, index; x < x1; ++x) {
for (int y = y0; y < y1; y += width) {
index = x + y;
// GL_ACCUM Obtains R, G, B, and A values from the buffer currently selected for
// reading (see glReadBuffer). Each component value is divided by 2^n– 1,
// where n is the number of bits allocated to each color component in the currently
// selected buffer. The result is a floating-point value in the range [0,1],
// which is multiplied by value and added to the corresponding pixel component in
// the accumulation buffer, thereby updating the accumulation buffer.
c1.set(cfb[index]);
// scale
if (scale) {
c1.r *= value;
c1.g *= value;
c1.b *= value;
c1.a *= value;
}
c2.set(localBuffer[index]);
// accumulate
c2.r += c1.r;
c2.g += c1.g;
c2.b += c1.b;
c2.a += c1.a;
localBuffer[index] = c2.getRGBAi();
}
}
}
public final void doReturn(final float value) {
// TOMD - scissoring ?
// int x0 = gc.transform.clipX0;
// int x1 = gc.transform.clipX1;
// int y0 = gc.transform.clipY0;
// int y1 = gc.transform.clipY1;
final int width = gc.frameBuffer.width;
final int x0 = gc.state.viewport.x;
final int x1 = gc.state.viewport.width;
final int y0 = gc.state.viewport.y * width;
final int y1 = gc.state.viewport.height * width;
final int[] cfb = gc.frameBuffer.readBuffer.buffer;
final boolean scale = value != 1.0f;
for (int x = x0, index; x < x1; ++x) {
for (int y = y0; y < y1; y += width) {
index = x + y;
// GL_RETURN Transfers accumulation buffer values to the color buffer or buffers
// currently selected for writing. Each R, G, B, and A component is multiplied by value,
// then multiplied by 2n– 1, clamped to the range [0, 2n – 1 ], and stored in the
// corresponding display buffer cell. The only fragment operations that are applied to
// this transfer are pixel ownership, scissor, dithering, and color writemasks.
c1.set(buffer[index]);
// scale
if (scale) {
c1.r *= value;
c1.g *= value;
c1.b *= value;
c1.a *= value;
}
// clamp
c1.r = c1.r < 0.0f ? 0.0f : (c1.r > 1.0f ? 1.0f : c1.r);
c1.g = c1.g < 0.0f ? 0.0f : (c1.g > 1.0f ? 1.0f : c1.g);
c1.b = c1.b < 0.0f ? 0.0f : (c1.b > 1.0f ? 1.0f : c1.b);
c1.a = c1.a < 0.0f ? 0.0f : (c1.a > 1.0f ? 1.0f : c1.a);
cfb[index] = c1.getRGBAi();
}
}
}