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st/mesa: fix DDY opcode for FBOs

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This fixes piglit/fbo-deriv.

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Marek Olšák
2012-07-23 01:27:51 +02:00
parent f40b5723f0
commit 82fc813ca8
1 changed files with 22 additions and 2 deletions
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24
src/mesa/state_tracker/st_glsl_to_tgsi.cpp
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@@ -1448,9 +1448,29 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
emit(ir, TGSI_OPCODE_DDX, result_dst, op[0]);
break;
case ir_unop_dFdy:
op[0].negate = ~op[0].negate;
emit(ir, TGSI_OPCODE_DDY, result_dst, op[0]);
{
/* The X component contains 1 or -1 depending on whether the framebuffer
* is a FBO or the window system buffer, respectively.
* It is then multiplied with the source operand of DDY.
*/
static const gl_state_index transform_y_state[STATE_LENGTH]
= { STATE_INTERNAL, STATE_FB_WPOS_Y_TRANSFORM };
unsigned transform_y_index =
_mesa_add_state_reference(this->prog->Parameters,
transform_y_state);
st_src_reg transform_y = st_src_reg(PROGRAM_STATE_VAR,
transform_y_index,
glsl_type::vec4_type);
transform_y.swizzle = SWIZZLE_XXXX;
st_src_reg temp = get_temp(glsl_type::vec4_type);
emit(ir, TGSI_OPCODE_MUL, st_dst_reg(temp), transform_y, op[0]);
emit(ir, TGSI_OPCODE_DDY, result_dst, temp);
break;
}
case ir_unop_noise: {
/* At some point, a motivated person could add a better