diff options
author | Brian Paul <brianp@vmware.com> | 2010-03-15 10:51:56 -0600 |
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committer | Brian Paul <brianp@vmware.com> | 2010-03-15 10:51:58 -0600 |
commit | 1d6d51413e546299010666ef64ce7e6c4a92064d (patch) | |
tree | 58c9616600924d2dd9f87c47994cf4fb4bc4ccf7 | |
parent | b9a81b626a4659d6d611516c8afea012d39b0e4a (diff) | |
download | external_mesa3d-1d6d51413e546299010666ef64ce7e6c4a92064d.zip external_mesa3d-1d6d51413e546299010666ef64ce7e6c4a92064d.tar.gz external_mesa3d-1d6d51413e546299010666ef64ce7e6c4a92064d.tar.bz2 |
gallivm: add min_lod==max_lod special-case code in lp_build_lod_selector()
When min_lod==max_lod we don't need to go through all the work of
computing the lod from partial derivatives. This is hit by the mipmap
generation utility code.
-rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c | 155 |
1 files changed, 83 insertions, 72 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c index 29845c6..9741dbb 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c @@ -843,87 +843,98 @@ lp_build_lod_selector(struct lp_build_sample_context *bld, LLVMValueRef depth) { - const int dims = texture_dims(bld->static_state->target); - struct lp_build_context *float_bld = &bld->float_bld; - LLVMValueRef lod_bias = LLVMConstReal(LLVMFloatType(), bld->static_state->lod_bias); - LLVMValueRef min_lod = LLVMConstReal(LLVMFloatType(), bld->static_state->min_lod); - LLVMValueRef max_lod = LLVMConstReal(LLVMFloatType(), bld->static_state->max_lod); - - LLVMValueRef index0 = LLVMConstInt(LLVMInt32Type(), 0, 0); - LLVMValueRef index1 = LLVMConstInt(LLVMInt32Type(), 1, 0); - LLVMValueRef index2 = LLVMConstInt(LLVMInt32Type(), 2, 0); - - LLVMValueRef s0, s1, s2; - LLVMValueRef t0, t1, t2; - LLVMValueRef r0, r1, r2; - LLVMValueRef dsdx, dsdy, dtdx, dtdy, drdx, drdy; - LLVMValueRef rho, lod; - - /* - * dsdx = abs(s[1] - s[0]); - * dsdy = abs(s[2] - s[0]); - * dtdx = abs(t[1] - t[0]); - * dtdy = abs(t[2] - t[0]); - * drdx = abs(r[1] - r[0]); - * drdy = abs(r[2] - r[0]); - * XXX we're assuming a four-element quad in 2x2 layout here. - */ - s0 = LLVMBuildExtractElement(bld->builder, s, index0, "s0"); - s1 = LLVMBuildExtractElement(bld->builder, s, index1, "s1"); - s2 = LLVMBuildExtractElement(bld->builder, s, index2, "s2"); - dsdx = LLVMBuildSub(bld->builder, s1, s0, ""); - dsdx = lp_build_abs(float_bld, dsdx); - dsdy = LLVMBuildSub(bld->builder, s2, s0, ""); - dsdy = lp_build_abs(float_bld, dsdy); - if (dims > 1) { - t0 = LLVMBuildExtractElement(bld->builder, t, index0, "t0"); - t1 = LLVMBuildExtractElement(bld->builder, t, index1, "t1"); - t2 = LLVMBuildExtractElement(bld->builder, t, index2, "t2"); - dtdx = LLVMBuildSub(bld->builder, t1, t0, ""); - dtdx = lp_build_abs(float_bld, dtdx); - dtdy = LLVMBuildSub(bld->builder, t2, t0, ""); - dtdy = lp_build_abs(float_bld, dtdy); - if (dims > 2) { - r0 = LLVMBuildExtractElement(bld->builder, r, index0, "r0"); - r1 = LLVMBuildExtractElement(bld->builder, r, index1, "r1"); - r2 = LLVMBuildExtractElement(bld->builder, r, index2, "r2"); - drdx = LLVMBuildSub(bld->builder, r1, r0, ""); - drdx = lp_build_abs(float_bld, drdx); - drdy = LLVMBuildSub(bld->builder, r2, r0, ""); - drdy = lp_build_abs(float_bld, drdy); - } + if (bld->static_state->min_lod == bld->static_state->max_lod) { + /* User is forcing sampling from a particular mipmap level. + * This is hit during mipmap generation. + */ + return LLVMConstReal(LLVMFloatType(), bld->static_state->min_lod); } + else { + const int dims = texture_dims(bld->static_state->target); + struct lp_build_context *float_bld = &bld->float_bld; + LLVMValueRef lod_bias = LLVMConstReal(LLVMFloatType(), + bld->static_state->lod_bias); + LLVMValueRef min_lod = LLVMConstReal(LLVMFloatType(), + bld->static_state->min_lod); + LLVMValueRef max_lod = LLVMConstReal(LLVMFloatType(), + bld->static_state->max_lod); + + LLVMValueRef index0 = LLVMConstInt(LLVMInt32Type(), 0, 0); + LLVMValueRef index1 = LLVMConstInt(LLVMInt32Type(), 1, 0); + LLVMValueRef index2 = LLVMConstInt(LLVMInt32Type(), 2, 0); + + LLVMValueRef s0, s1, s2; + LLVMValueRef t0, t1, t2; + LLVMValueRef r0, r1, r2; + LLVMValueRef dsdx, dsdy, dtdx, dtdy, drdx, drdy; + LLVMValueRef rho, lod; + + /* + * dsdx = abs(s[1] - s[0]); + * dsdy = abs(s[2] - s[0]); + * dtdx = abs(t[1] - t[0]); + * dtdy = abs(t[2] - t[0]); + * drdx = abs(r[1] - r[0]); + * drdy = abs(r[2] - r[0]); + * XXX we're assuming a four-element quad in 2x2 layout here. + */ + s0 = LLVMBuildExtractElement(bld->builder, s, index0, "s0"); + s1 = LLVMBuildExtractElement(bld->builder, s, index1, "s1"); + s2 = LLVMBuildExtractElement(bld->builder, s, index2, "s2"); + dsdx = LLVMBuildSub(bld->builder, s1, s0, ""); + dsdx = lp_build_abs(float_bld, dsdx); + dsdy = LLVMBuildSub(bld->builder, s2, s0, ""); + dsdy = lp_build_abs(float_bld, dsdy); + if (dims > 1) { + t0 = LLVMBuildExtractElement(bld->builder, t, index0, "t0"); + t1 = LLVMBuildExtractElement(bld->builder, t, index1, "t1"); + t2 = LLVMBuildExtractElement(bld->builder, t, index2, "t2"); + dtdx = LLVMBuildSub(bld->builder, t1, t0, ""); + dtdx = lp_build_abs(float_bld, dtdx); + dtdy = LLVMBuildSub(bld->builder, t2, t0, ""); + dtdy = lp_build_abs(float_bld, dtdy); + if (dims > 2) { + r0 = LLVMBuildExtractElement(bld->builder, r, index0, "r0"); + r1 = LLVMBuildExtractElement(bld->builder, r, index1, "r1"); + r2 = LLVMBuildExtractElement(bld->builder, r, index2, "r2"); + drdx = LLVMBuildSub(bld->builder, r1, r0, ""); + drdx = lp_build_abs(float_bld, drdx); + drdy = LLVMBuildSub(bld->builder, r2, r0, ""); + drdy = lp_build_abs(float_bld, drdy); + } + } - /* Compute rho = max of all partial derivatives scaled by texture size. - * XXX this could be vectorized somewhat - */ - rho = LLVMBuildMul(bld->builder, - lp_build_max(float_bld, dsdx, dsdy), - lp_build_int_to_float(float_bld, width), ""); - if (dims > 1) { - LLVMValueRef max; - max = LLVMBuildMul(bld->builder, - lp_build_max(float_bld, dtdx, dtdy), - lp_build_int_to_float(float_bld, height), ""); - rho = lp_build_max(float_bld, rho, max); - if (dims > 2) { + /* Compute rho = max of all partial derivatives scaled by texture size. + * XXX this could be vectorized somewhat + */ + rho = LLVMBuildMul(bld->builder, + lp_build_max(float_bld, dsdx, dsdy), + lp_build_int_to_float(float_bld, width), ""); + if (dims > 1) { + LLVMValueRef max; max = LLVMBuildMul(bld->builder, - lp_build_max(float_bld, drdx, drdy), - lp_build_int_to_float(float_bld, depth), ""); + lp_build_max(float_bld, dtdx, dtdy), + lp_build_int_to_float(float_bld, height), ""); rho = lp_build_max(float_bld, rho, max); + if (dims > 2) { + max = LLVMBuildMul(bld->builder, + lp_build_max(float_bld, drdx, drdy), + lp_build_int_to_float(float_bld, depth), ""); + rho = lp_build_max(float_bld, rho, max); + } } - } - /* compute lod = log2(rho) */ - lod = lp_build_log2(float_bld, rho); + /* compute lod = log2(rho) */ + lod = lp_build_log2(float_bld, rho); - /* add lod bias */ - lod = LLVMBuildAdd(bld->builder, lod, lod_bias, "LOD bias"); + /* add lod bias */ + lod = LLVMBuildAdd(bld->builder, lod, lod_bias, "LOD bias"); - /* clamp lod */ - lod = lp_build_clamp(float_bld, lod, min_lod, max_lod); + /* clamp lod */ + lod = lp_build_clamp(float_bld, lod, min_lod, max_lod); - return lod; + return lod; + } } |