KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

r300g: optimize blending by conditionally disabling reads from the colorbuffer

This commit is contained in:
Marek Olšák 2009-12-21 01:38:45 +01:00 committed by Corbin Simpson
parent 6b9b3213c5
commit 7c902b43d8
2 changed files with 30 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/gallium/drivers/r300/r300_reg.h
View File

@ -2186,6 +2186,8 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
# define R300_DISCARD_SRC_PIXELS_SRC_ALPHA_1 (4 << 3)
# define R300_DISCARD_SRC_PIXELS_SRC_COLOR_1 (5 << 3)
# define R300_DISCARD_SRC_PIXELS_SRC_ALPHA_COLOR_1 (6 << 3)
# define R500_SRC_ALPHA_0_NO_READ (1 << 30)
# define R500_SRC_ALPHA_1_NO_READ (1 << 31)
/* the following are shared between CBLEND and ABLEND */
# define R300_FCN_MASK (3 << 12)

31
src/gallium/drivers/r300/r300_state.c
View File

@ -198,9 +198,36 @@ static void* r300_create_blend_state(struct pipe_context* pipe,
srcA == PIPE_BLENDFACTOR_DST_ALPHA ||
srcA == PIPE_BLENDFACTOR_INV_DST_COLOR ||
srcA == PIPE_BLENDFACTOR_INV_DST_ALPHA ||
srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE)
srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE) {
/* Enable reading from the colorbuffer. */
blend->blend_control |= R300_READ_ENABLE;
if (r300_screen(r300_context(pipe)->context.screen)->caps->is_r500) {
/* Optimization: Depending on incoming pixels, we can
* conditionally disable the reading in hardware... */
if (eqRGB != PIPE_BLEND_MIN && eqA != PIPE_BLEND_MIN &&
eqRGB != PIPE_BLEND_MAX && eqA != PIPE_BLEND_MAX) {
/* Disable reading if SRC_ALPHA == 0. */
if ((dstRGB == PIPE_BLENDFACTOR_SRC_ALPHA ||
dstRGB == PIPE_BLENDFACTOR_ZERO) &&
(dstA == PIPE_BLENDFACTOR_SRC_COLOR ||
dstA == PIPE_BLENDFACTOR_SRC_ALPHA ||
dstA == PIPE_BLENDFACTOR_ZERO)) {
blend->blend_control |= R500_SRC_ALPHA_0_NO_READ;
}
/* Disable reading if SRC_ALPHA == 1. */
if ((dstRGB == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
dstRGB == PIPE_BLENDFACTOR_ZERO) &&
(dstA == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
dstA == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
dstA == PIPE_BLENDFACTOR_ZERO)) {
blend->blend_control |= R500_SRC_ALPHA_1_NO_READ;
}
}
}
}
/* Optimization: discard pixels which don't change the colorbuffer.
*
* The code below is non-trivial and some math is involved.
@ -246,8 +273,6 @@ static void* r300_create_blend_state(struct pipe_context* pipe,
}
}
/* XXX implement the optimization with SRC_ALPHA_?_NO_READ */
/* separate alpha */
if (srcA != srcRGB || dstA != dstRGB || eqA != eqRGB) {
blend->blend_control |= R300_SEPARATE_ALPHA_ENABLE;