diff options
| -rw-r--r-- | src/gallium/drivers/llvmpipe/lp_bld_interp.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_interp.c b/src/gallium/drivers/llvmpipe/lp_bld_interp.c index 2a374f8c390..ee92ce3cdc1 100644 --- a/src/gallium/drivers/llvmpipe/lp_bld_interp.c +++ b/src/gallium/drivers/llvmpipe/lp_bld_interp.c @@ -206,7 +206,7 @@ coeffs_init(struct lp_build_interp_soa_context *bld, dadq2 = LLVMBuildFAdd(builder, dadq, dadq, ""); /* - * a = a0 + x * dadx + y * dady + * a = a0 + (x * dadx + y * dady) */ if (attrib == 0 && chan == 0) { @@ -219,11 +219,11 @@ coeffs_init(struct lp_build_interp_soa_context *bld, a = a0; if (interp != LP_INTERP_CONSTANT && interp != LP_INTERP_FACING) { - LLVMValueRef tmp; - tmp = LLVMBuildFMul(builder, bld->x, dadx, ""); - a = LLVMBuildFAdd(builder, a, tmp, ""); - tmp = LLVMBuildFMul(builder, bld->y, dady, ""); - a = LLVMBuildFAdd(builder, a, tmp, ""); + LLVMValueRef ax, ay, axy; + ax = LLVMBuildFMul(builder, bld->x, dadx, ""); + ay = LLVMBuildFMul(builder, bld->y, dady, ""); + axy = LLVMBuildFAdd(builder, ax, ay, ""); + a = LLVMBuildFAdd(builder, a, axy, ""); } } @@ -350,6 +350,14 @@ attribs_update(struct lp_build_interp_soa_context *bld, int quad_index) } #endif + if (attrib == 0 && chan == 2) { + /* FIXME: Depth values can exceed 1.0, due to the fact that + * setup interpolation coefficients refer to (0,0) which causes + * precision loss. So we must clamp to 1.0 here to avoid artifacts + */ + a = lp_build_min(coeff_bld, a, coeff_bld->one); + } + attrib_name(a, attrib, chan, ""); } bld->attribs[attrib][chan] = a; |