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glamor_trapezoid: workaround a glsl like problem.

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It seems that the following statement cann't run as expected on SNB.
bool trap_left_vertical = (abs(trap_left_vertical_f - 1.0) <= 0.0001);

Have to rewrite it to another style to let the vertical edge trapezoid
to be rendered correctly.

Reviewed-by: Junyan He <junyan.he@linux.intel.com>
Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>
This commit is contained in:
Zhigang Gong 2012-08-01 18:27:29 +08:00 committed by Eric Anholt
parent 5512c14e34
commit e7af7cb76d
1 changed files with 10 additions and 2 deletions
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12
glamor/glamor_trapezoid.c
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@ -1068,8 +1068,6 @@ glamor_init_trapezoid_shader(ScreenPtr screen)
"varying float trap_right_vertical_f; \n"
"float x_per_pix = 1.0;"
"float y_per_pix = 1.0;"
"bool trap_left_vertical = (abs(trap_left_vertical_f - 1.0) <= 0.0001);\n"
"bool trap_right_vertical = (abs(trap_right_vertical_f - 1.0) <= 0.0001);\n"
"\n"
"float get_alpha_val() \n"
"{ \n"
@ -1077,6 +1075,16 @@ glamor_init_trapezoid_shader(ScreenPtr screen)
" float x_bottom_cut_left; \n"
" float x_up_cut_right; \n"
" float x_bottom_cut_right; \n"
" bool trap_left_vertical;\n"
" bool trap_right_vertical;\n"
" if (abs(trap_left_vertical_f - 1.0) <= 0.0001)\n"
" trap_left_vertical = true;\n"
" else\n"
" trap_left_vertical = false;\n"
" if (abs(trap_right_vertical_f - 1.0) <= 0.0001)\n"
" trap_right_vertical = true;\n"
" else\n"
" trap_right_vertical = false;\n"
" \n"
" if(trap_left_vertical == true) { \n"
" x_up_cut_left = trap_left_x; \n"