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i965/blorp: Define a function to clamp texture coordinates

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New function clamp_tex_coords() clamps the texture coordinates
to texture boundaries.  This function will also be utilized later
for the BLORP implementation of single-sample scaled blit with
bilinear filter.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
This commit is contained in:
Anuj Phogat 2013-07-18 14:59:29 -07:00
parent 6066fb1721
commit aff371b634
1 changed files with 39 additions and 24 deletions
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63
src/mesa/drivers/dri/i965/brw_blorp_blit.cpp
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@ -631,6 +631,9 @@ private:
void decode_msaa(unsigned num_samples, intel_msaa_layout layout);
void kill_if_outside_dst_rect();
void translate_dst_to_src();
void clamp_tex_coords(struct brw_reg regX, struct brw_reg regY,
struct brw_reg clampX0, struct brw_reg clampY0,
struct brw_reg clampX1, struct brw_reg clampY1);
void single_to_blend();
void manual_blend_average(unsigned num_samples);
void manual_blend_bilinear(unsigned num_samples);
@ -1389,6 +1392,10 @@ brw_blorp_blit_program::kill_if_outside_dst_rect()
brw_pop_insn_state(&func);
}
#define X_f retype(X, BRW_REGISTER_TYPE_F)
#define Y_f retype(Y, BRW_REGISTER_TYPE_F)
#define Xp_f retype(Xp, BRW_REGISTER_TYPE_F)
#define Yp_f retype(Yp, BRW_REGISTER_TYPE_F)
/**
* Emit code to translate from destination (X, Y) coordinates to source (X, Y)
* coordinates.
@ -1396,11 +1403,6 @@ brw_blorp_blit_program::kill_if_outside_dst_rect()
void
brw_blorp_blit_program::translate_dst_to_src()
{
struct brw_reg X_f = retype(X, BRW_REGISTER_TYPE_F);
struct brw_reg Y_f = retype(Y, BRW_REGISTER_TYPE_F);
struct brw_reg Xp_f = retype(Xp, BRW_REGISTER_TYPE_F);
struct brw_reg Yp_f = retype(Yp, BRW_REGISTER_TYPE_F);
brw_set_compression_control(&func, BRW_COMPRESSION_COMPRESSED);
/* Move the UD coordinates to float registers. */
brw_MOV(&func, Xp_f, X);
@ -1425,25 +1427,9 @@ brw_blorp_blit_program::translate_dst_to_src()
/* Clamp the X, Y texture coordinates to properly handle the sampling of
* texels on texture edges.
*/
brw_CMP(&func, vec16(brw_null_reg()), BRW_CONDITIONAL_L,
X_f, brw_imm_f(0.0));
brw_MOV(&func, X_f, brw_imm_f(0.0));
brw_set_predicate_control(&func, BRW_PREDICATE_NONE);
brw_CMP(&func, vec16(brw_null_reg()), BRW_CONDITIONAL_GE,
X_f, rect_grid_x1);
brw_MOV(&func, X_f, rect_grid_x1);
brw_set_predicate_control(&func, BRW_PREDICATE_NONE);
brw_CMP(&func, vec16(brw_null_reg()), BRW_CONDITIONAL_L,
Y_f, brw_imm_f(0.0));
brw_MOV(&func, Y_f, brw_imm_f(0.0));
brw_set_predicate_control(&func, BRW_PREDICATE_NONE);
brw_CMP(&func, vec16(brw_null_reg()), BRW_CONDITIONAL_GE,
Y_f, rect_grid_y1);
brw_MOV(&func, Y_f, rect_grid_y1);
brw_set_predicate_control(&func, BRW_PREDICATE_NONE);
clamp_tex_coords(X_f, Y_f,
brw_imm_f(0.0), brw_imm_f(0.0),
rect_grid_x1, rect_grid_y1);
/* Store the fractional parts to be used as bilinear interpolation
* coefficients.
@ -1467,6 +1453,35 @@ brw_blorp_blit_program::translate_dst_to_src()
brw_set_compression_control(&func, BRW_COMPRESSION_NONE);
}
void
brw_blorp_blit_program::clamp_tex_coords(struct brw_reg regX,
struct brw_reg regY,
struct brw_reg clampX0,
struct brw_reg clampY0,
struct brw_reg clampX1,
struct brw_reg clampY1)
{
brw_CMP(&func, vec16(brw_null_reg()), BRW_CONDITIONAL_L, regX, clampX0);
brw_MOV(&func, regX, clampX0);
brw_set_predicate_control(&func, BRW_PREDICATE_NONE);
brw_CMP(&func, vec16(brw_null_reg()), BRW_CONDITIONAL_G, regX, clampX1);
brw_MOV(&func, regX, clampX1);
brw_set_predicate_control(&func, BRW_PREDICATE_NONE);
brw_CMP(&func, vec16(brw_null_reg()), BRW_CONDITIONAL_L, regY, clampY0);
brw_MOV(&func, regY, clampY0);
brw_set_predicate_control(&func, BRW_PREDICATE_NONE);
brw_CMP(&func, vec16(brw_null_reg()), BRW_CONDITIONAL_G, regY, clampY1);
brw_MOV(&func, regY, clampY1);
brw_set_predicate_control(&func, BRW_PREDICATE_NONE);
}
#undef X_f
#undef Y_f
#undef Xp_f
#undef Yp_f
/**
* Emit code to transform the X and Y coordinates as needed for blending
* together the different samples in an MSAA texture.