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TINYGL: Unroll FrameBuffer::blitOffscreenBuffer.

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This method is used to blit large buffers, so a large unrolling is still
beneficial. As it is the second hottest-spot in grim, the frame rate
increase is most significant there (compared to emi).
This commit is contained in:
Vincent Pelletier 2016-07-19 15:38:02 +02:00
parent 9b8c5a8e06
commit 80983c1b69
1 changed files with 55 additions and 8 deletions
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63
graphics/tinygl/zbuffer.cpp
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@ -210,20 +210,67 @@ void FrameBuffer::clearRegion(int x, int y, int w, int h, int clearZ, int z, int
}
}
inline static void blitPixel(uint8 offset, unsigned int *from_z, unsigned int *to_z, unsigned int z_length, byte *from_color, byte *to_color, unsigned int color_length) {
const unsigned int d = from_z[offset];
if (d > to_z[offset]) {
memcpy(to_color + offset, from_color + offset, color_length);
memcpy(to_z + offset, &d, z_length);
}
}
void FrameBuffer::blitOffscreenBuffer(Buffer *buf) {
// TODO: could be faster, probably.
#define UNROLL_COUNT 16
if (buf->used) {
for (int i = 0; i < this->xsize * this->ysize; ++i) {
unsigned int d1 = buf->zbuf[i];
unsigned int d2 = this->_zbuf[i];
if (d1 > d2) {
const int offset = i * this->pixelbytes;
memcpy(this->pbuf.getRawBuffer() + offset, buf->pbuf + offset, this->pixelbytes);
memcpy(this->_zbuf + i, buf->zbuf + i, sizeof(int));
}
const int pixel_bytes = this->pixelbytes;
const int unrolled_pixel_bytes = pixel_bytes * UNROLL_COUNT;
byte *to = this->pbuf.getRawBuffer();
byte *from = buf->pbuf;
unsigned int *to_z = this->_zbuf;
unsigned int *from_z = buf->zbuf;
int count = this->xsize * this->ysize;
while (count >= UNROLL_COUNT) {
blitPixel(0x0, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0x1, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0x2, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0x3, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0x4, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0x5, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0x6, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0x7, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0x8, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0x9, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0xA, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0xB, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0xC, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0xD, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0xE, from_z, to_z, sizeof(int), from, to, pixel_bytes);
blitPixel(0xF, from_z, to_z, sizeof(int), from, to, pixel_bytes);
count -= UNROLL_COUNT;
to += unrolled_pixel_bytes;
from += unrolled_pixel_bytes;
to_z += UNROLL_COUNT;
}
switch (count) {
case 0xF: blitPixel(0xE, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0xE: blitPixel(0xD, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0xD: blitPixel(0xC, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0xC: blitPixel(0xB, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0xB: blitPixel(0xA, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0xA: blitPixel(0x9, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x9: blitPixel(0x8, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x8: blitPixel(0x7, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x7: blitPixel(0x6, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x6: blitPixel(0x5, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x5: blitPixel(0x4, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x4: blitPixel(0x3, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x3: blitPixel(0x2, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x2: blitPixel(0x1, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x1: blitPixel(0x0, from_z, to_z, sizeof(int), from, to, pixel_bytes);
case 0x0: break;
}
}
#undef UNROLL_COUNT
}
void FrameBuffer::selectOffscreenBuffer(Buffer *buf) {