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authorBrian Paul <[email protected]>2009-01-28 14:48:41 -0700
committerBrian Paul <[email protected]>2009-01-28 14:48:41 -0700
commit9e7903e492ad842481a166484e0474dd4f3100ba (patch)
tree730fe62753def0d4b3a8b4f8d2d69ffb944fb556 /src/mesa/drivers
parent68acc61fc3dd110949f26af01ef5943e6de85ec7 (diff)
i965: minor clean-up, comments, etc.
Diffstat (limited to 'src/mesa/drivers')
-rw-r--r--src/mesa/drivers/dri/i965/brw_wm_fp.c46
1 files changed, 31 insertions, 15 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_wm_fp.c b/src/mesa/drivers/dri/i965/brw_wm_fp.c
index 6df2c95d80c..fdacad0053c 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_fp.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_fp.c
@@ -554,12 +554,19 @@ static void precalc_lit( struct brw_wm_compile *c,
}
}
+
+/**
+ * Some TEX instructions require extra code, cube map coordinate
+ * normalization, or coordinate scaling for RECT textures, etc.
+ * This function emits those extra instructions and the TEX
+ * instruction itself.
+ */
static void precalc_tex( struct brw_wm_compile *c,
const struct prog_instruction *inst )
{
struct prog_src_register coord;
struct prog_dst_register tmpcoord;
- GLuint unit = c->fp->program.Base.SamplerUnits[inst->TexSrcUnit];
+ const GLuint unit = c->fp->program.Base.SamplerUnits[inst->TexSrcUnit];
if (inst->TexSrcTarget == TEXTURE_CUBE_INDEX) {
struct prog_instruction *out;
@@ -569,9 +576,11 @@ static void precalc_tex( struct brw_wm_compile *c,
struct prog_src_register tmp1src = src_reg_from_dst(tmp1);
struct prog_src_register src0 = inst->SrcReg[0];
+ /* find longest component of coord vector and normalize it */
tmpcoord = get_temp(c);
coord = src_reg_from_dst(tmpcoord);
+ /* tmpcoord = src0 (i.e.: coord = src0) */
out = emit_op(c, OPCODE_MOV,
tmpcoord,
0, 0, 0,
@@ -581,6 +590,7 @@ static void precalc_tex( struct brw_wm_compile *c,
out->SrcReg[0].NegateBase = 0;
out->SrcReg[0].Abs = 1;
+ /* tmp0 = MAX(coord.X, coord.Y) */
emit_op(c, OPCODE_MAX,
tmp0,
0, 0, 0,
@@ -588,6 +598,7 @@ static void precalc_tex( struct brw_wm_compile *c,
src_swizzle1(coord, Y),
src_undef());
+ /* tmp1 = MAX(tmp0, coord.Z) */
emit_op(c, OPCODE_MAX,
tmp1,
0, 0, 0,
@@ -595,6 +606,7 @@ static void precalc_tex( struct brw_wm_compile *c,
src_swizzle1(coord, Z),
src_undef());
+ /* tmp0 = 1 / tmp1 */
emit_op(c, OPCODE_RCP,
tmp0,
0, 0, 0,
@@ -602,6 +614,7 @@ static void precalc_tex( struct brw_wm_compile *c,
src_undef(),
src_undef());
+ /* tmpCoord = src0 * tmp0 */
emit_op(c, OPCODE_MUL,
tmpcoord,
0, 0, 0,
@@ -611,7 +624,8 @@ static void precalc_tex( struct brw_wm_compile *c,
release_temp(c, tmp0);
release_temp(c, tmp1);
- } else if (inst->TexSrcTarget == TEXTURE_RECT_INDEX) {
+ }
+ else if (inst->TexSrcTarget == TEXTURE_RECT_INDEX) {
struct prog_src_register scale =
search_or_add_param5( c,
STATE_INTERNAL,
@@ -642,19 +656,9 @@ static void precalc_tex( struct brw_wm_compile *c,
* conversion requires allocating a temporary variable which we
* don't have the facility to do that late in the compilation.
*/
- if (!(c->key.yuvtex_mask & (1<<unit))) {
- emit_op(c,
- OPCODE_TEX,
- inst->DstReg,
- inst->SaturateMode,
- unit,
- inst->TexSrcTarget,
- coord,
- src_undef(),
- src_undef());
- }
- else {
- GLboolean swap_uv = c->key.yuvtex_swap_mask & (1<<unit);
+ if (c->key.yuvtex_mask & (1 << unit)) {
+ /* convert ycbcr to RGBA */
+ GLboolean swap_uv = c->key.yuvtex_swap_mask & (1<<unit);
/*
CONST C0 = { -.5, -.0625, -.5, 1.164 }
@@ -734,6 +738,18 @@ static void precalc_tex( struct brw_wm_compile *c,
release_temp(c, tmp);
}
+ else {
+ /* ordinary RGBA tex instruction */
+ emit_op(c,
+ OPCODE_TEX,
+ inst->DstReg,
+ inst->SaturateMode,
+ unit,
+ inst->TexSrcTarget,
+ coord,
+ src_undef(),
+ src_undef());
+ }
if ((inst->TexSrcTarget == TEXTURE_RECT_INDEX) ||
(inst->TexSrcTarget == TEXTURE_CUBE_INDEX))