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.
This commit is contained in:
Brian Paul
@@ -843,87 +843,98 @@ lp_build_lod_selector(struct lp_build_sample_context *bld,
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LLVMValueRef depth)
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{
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const int dims = texture_dims(bld->static_state->target);
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struct lp_build_context *float_bld = &bld->float_bld;
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LLVMValueRef lod_bias = LLVMConstReal(LLVMFloatType(), bld->static_state->lod_bias);
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LLVMValueRef min_lod = LLVMConstReal(LLVMFloatType(), bld->static_state->min_lod);
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LLVMValueRef max_lod = LLVMConstReal(LLVMFloatType(), bld->static_state->max_lod);
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LLVMValueRef index0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
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LLVMValueRef index1 = LLVMConstInt(LLVMInt32Type(), 1, 0);
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LLVMValueRef index2 = LLVMConstInt(LLVMInt32Type(), 2, 0);
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LLVMValueRef s0, s1, s2;
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LLVMValueRef t0, t1, t2;
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LLVMValueRef r0, r1, r2;
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LLVMValueRef dsdx, dsdy, dtdx, dtdy, drdx, drdy;
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LLVMValueRef rho, lod;
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/*
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* dsdx = abs(s[1] - s[0]);
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* dsdy = abs(s[2] - s[0]);
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* dtdx = abs(t[1] - t[0]);
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* dtdy = abs(t[2] - t[0]);
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* drdx = abs(r[1] - r[0]);
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* drdy = abs(r[2] - r[0]);
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* XXX we're assuming a four-element quad in 2x2 layout here.
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*/
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s0 = LLVMBuildExtractElement(bld->builder, s, index0, "s0");
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s1 = LLVMBuildExtractElement(bld->builder, s, index1, "s1");
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s2 = LLVMBuildExtractElement(bld->builder, s, index2, "s2");
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dsdx = LLVMBuildSub(bld->builder, s1, s0, "");
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dsdx = lp_build_abs(float_bld, dsdx);
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dsdy = LLVMBuildSub(bld->builder, s2, s0, "");
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dsdy = lp_build_abs(float_bld, dsdy);
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if (dims > 1) {
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t0 = LLVMBuildExtractElement(bld->builder, t, index0, "t0");
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t1 = LLVMBuildExtractElement(bld->builder, t, index1, "t1");
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t2 = LLVMBuildExtractElement(bld->builder, t, index2, "t2");
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dtdx = LLVMBuildSub(bld->builder, t1, t0, "");
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dtdx = lp_build_abs(float_bld, dtdx);
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dtdy = LLVMBuildSub(bld->builder, t2, t0, "");
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dtdy = lp_build_abs(float_bld, dtdy);
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if (dims > 2) {
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r0 = LLVMBuildExtractElement(bld->builder, r, index0, "r0");
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r1 = LLVMBuildExtractElement(bld->builder, r, index1, "r1");
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r2 = LLVMBuildExtractElement(bld->builder, r, index2, "r2");
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drdx = LLVMBuildSub(bld->builder, r1, r0, "");
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drdx = lp_build_abs(float_bld, drdx);
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drdy = LLVMBuildSub(bld->builder, r2, r0, "");
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drdy = lp_build_abs(float_bld, drdy);
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}
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if (bld->static_state->min_lod == bld->static_state->max_lod) {
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/* User is forcing sampling from a particular mipmap level.
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* This is hit during mipmap generation.
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*/
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return LLVMConstReal(LLVMFloatType(), bld->static_state->min_lod);
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}
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else {
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const int dims = texture_dims(bld->static_state->target);
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struct lp_build_context *float_bld = &bld->float_bld;
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LLVMValueRef lod_bias = LLVMConstReal(LLVMFloatType(),
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bld->static_state->lod_bias);
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LLVMValueRef min_lod = LLVMConstReal(LLVMFloatType(),
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bld->static_state->min_lod);
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LLVMValueRef max_lod = LLVMConstReal(LLVMFloatType(),
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bld->static_state->max_lod);
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/* Compute rho = max of all partial derivatives scaled by texture size.
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* XXX this could be vectorized somewhat
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*/
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rho = LLVMBuildMul(bld->builder,
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lp_build_max(float_bld, dsdx, dsdy),
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lp_build_int_to_float(float_bld, width), "");
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if (dims > 1) {
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LLVMValueRef max;
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max = LLVMBuildMul(bld->builder,
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lp_build_max(float_bld, dtdx, dtdy),
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lp_build_int_to_float(float_bld, height), "");
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rho = lp_build_max(float_bld, rho, max);
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if (dims > 2) {
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LLVMValueRef index0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
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LLVMValueRef index1 = LLVMConstInt(LLVMInt32Type(), 1, 0);
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LLVMValueRef index2 = LLVMConstInt(LLVMInt32Type(), 2, 0);
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LLVMValueRef s0, s1, s2;
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LLVMValueRef t0, t1, t2;
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LLVMValueRef r0, r1, r2;
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LLVMValueRef dsdx, dsdy, dtdx, dtdy, drdx, drdy;
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LLVMValueRef rho, lod;
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/*
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* dsdx = abs(s[1] - s[0]);
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* dsdy = abs(s[2] - s[0]);
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* dtdx = abs(t[1] - t[0]);
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* dtdy = abs(t[2] - t[0]);
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* drdx = abs(r[1] - r[0]);
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* drdy = abs(r[2] - r[0]);
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* XXX we're assuming a four-element quad in 2x2 layout here.
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*/
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s0 = LLVMBuildExtractElement(bld->builder, s, index0, "s0");
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s1 = LLVMBuildExtractElement(bld->builder, s, index1, "s1");
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s2 = LLVMBuildExtractElement(bld->builder, s, index2, "s2");
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dsdx = LLVMBuildSub(bld->builder, s1, s0, "");
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dsdx = lp_build_abs(float_bld, dsdx);
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dsdy = LLVMBuildSub(bld->builder, s2, s0, "");
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dsdy = lp_build_abs(float_bld, dsdy);
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if (dims > 1) {
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t0 = LLVMBuildExtractElement(bld->builder, t, index0, "t0");
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t1 = LLVMBuildExtractElement(bld->builder, t, index1, "t1");
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t2 = LLVMBuildExtractElement(bld->builder, t, index2, "t2");
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dtdx = LLVMBuildSub(bld->builder, t1, t0, "");
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dtdx = lp_build_abs(float_bld, dtdx);
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dtdy = LLVMBuildSub(bld->builder, t2, t0, "");
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dtdy = lp_build_abs(float_bld, dtdy);
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if (dims > 2) {
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r0 = LLVMBuildExtractElement(bld->builder, r, index0, "r0");
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r1 = LLVMBuildExtractElement(bld->builder, r, index1, "r1");
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r2 = LLVMBuildExtractElement(bld->builder, r, index2, "r2");
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drdx = LLVMBuildSub(bld->builder, r1, r0, "");
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drdx = lp_build_abs(float_bld, drdx);
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drdy = LLVMBuildSub(bld->builder, r2, r0, "");
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drdy = lp_build_abs(float_bld, drdy);
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}
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}
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/* Compute rho = max of all partial derivatives scaled by texture size.
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* XXX this could be vectorized somewhat
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*/
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rho = LLVMBuildMul(bld->builder,
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lp_build_max(float_bld, dsdx, dsdy),
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lp_build_int_to_float(float_bld, width), "");
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if (dims > 1) {
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LLVMValueRef max;
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max = LLVMBuildMul(bld->builder,
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lp_build_max(float_bld, drdx, drdy),
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lp_build_int_to_float(float_bld, depth), "");
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lp_build_max(float_bld, dtdx, dtdy),
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lp_build_int_to_float(float_bld, height), "");
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rho = lp_build_max(float_bld, rho, max);
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if (dims > 2) {
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max = LLVMBuildMul(bld->builder,
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lp_build_max(float_bld, drdx, drdy),
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lp_build_int_to_float(float_bld, depth), "");
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rho = lp_build_max(float_bld, rho, max);
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}
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}
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/* compute lod = log2(rho) */
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lod = lp_build_log2(float_bld, rho);
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/* add lod bias */
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lod = LLVMBuildAdd(bld->builder, lod, lod_bias, "LOD bias");
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/* clamp lod */
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lod = lp_build_clamp(float_bld, lod, min_lod, max_lod);
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return lod;
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}
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/* compute lod = log2(rho) */
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lod = lp_build_log2(float_bld, rho);
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/* add lod bias */
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lod = LLVMBuildAdd(bld->builder, lod, lod_bias, "LOD bias");
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/* clamp lod */
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lod = lp_build_clamp(float_bld, lod, min_lod, max_lod);
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return lod;
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}
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