| /* libs/pixelflinger/codeflinger/blending.cpp |
| ** |
| ** Copyright 2006, The Android Open Source Project |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| |
| #include <assert.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <sys/types.h> |
| |
| #include <cutils/log.h> |
| |
| #include "GGLAssembler.h" |
| |
| |
| namespace android { |
| |
| void GGLAssembler::build_fog( |
| component_t& temp, // incomming fragment / output |
| int component, |
| Scratch& regs) |
| { |
| if (mInfo[component].fog) { |
| Scratch scratches(registerFile()); |
| comment("fog"); |
| |
| integer_t fragment(temp.reg, temp.h, temp.flags); |
| if (!(temp.flags & CORRUPTIBLE)) { |
| temp.reg = regs.obtain(); |
| temp.flags |= CORRUPTIBLE; |
| } |
| |
| integer_t fogColor(scratches.obtain(), 8, CORRUPTIBLE); |
| LDRB(AL, fogColor.reg, mBuilderContext.Rctx, |
| immed12_pre(GGL_OFFSETOF(state.fog.color[component]))); |
| |
| integer_t factor(scratches.obtain(), 16, CORRUPTIBLE); |
| CONTEXT_LOAD(factor.reg, generated_vars.f); |
| |
| // clamp fog factor (TODO: see if there is a way to guarantee |
| // we won't overflow, when setting the iterators) |
| BIC(AL, 0, factor.reg, factor.reg, reg_imm(factor.reg, ASR, 31)); |
| CMP(AL, factor.reg, imm( 0x10000 )); |
| MOV(HS, 0, factor.reg, imm( 0x10000 )); |
| |
| build_blendFOneMinusF(temp, factor, fragment, fogColor); |
| } |
| } |
| |
| void GGLAssembler::build_blending( |
| component_t& temp, // incomming fragment / output |
| const pixel_t& pixel, // framebuffer |
| int component, |
| Scratch& regs) |
| { |
| if (!mInfo[component].blend) |
| return; |
| |
| int fs = component==GGLFormat::ALPHA ? mBlendSrcA : mBlendSrc; |
| int fd = component==GGLFormat::ALPHA ? mBlendDstA : mBlendDst; |
| if (fs==GGL_SRC_ALPHA_SATURATE && component==GGLFormat::ALPHA) |
| fs = GGL_ONE; |
| const int blending = blending_codes(fs, fd); |
| if (!temp.size()) { |
| // here, blending will produce something which doesn't depend on |
| // that component (eg: GL_ZERO:GL_*), so the register has not been |
| // allocated yet. Will never be used as a source. |
| temp = component_t(regs.obtain(), CORRUPTIBLE); |
| } |
| |
| // we are doing real blending... |
| // fb: extracted dst |
| // fragment: extracted src |
| // temp: component_t(fragment) and result |
| |
| // scoped register allocator |
| Scratch scratches(registerFile()); |
| comment("blending"); |
| |
| // we can optimize these cases a bit... |
| // (1) saturation is not needed |
| // (2) we can use only one multiply instead of 2 |
| // (3) we can reduce the register pressure |
| // R = S*f + D*(1-f) = (S-D)*f + D |
| // R = S*(1-f) + D*f = (D-S)*f + S |
| |
| const bool same_factor_opt1 = |
| (fs==GGL_DST_COLOR && fd==GGL_ONE_MINUS_DST_COLOR) || |
| (fs==GGL_SRC_COLOR && fd==GGL_ONE_MINUS_SRC_COLOR) || |
| (fs==GGL_DST_ALPHA && fd==GGL_ONE_MINUS_DST_ALPHA) || |
| (fs==GGL_SRC_ALPHA && fd==GGL_ONE_MINUS_SRC_ALPHA); |
| |
| const bool same_factor_opt2 = |
| (fs==GGL_ONE_MINUS_DST_COLOR && fd==GGL_DST_COLOR) || |
| (fs==GGL_ONE_MINUS_SRC_COLOR && fd==GGL_SRC_COLOR) || |
| (fs==GGL_ONE_MINUS_DST_ALPHA && fd==GGL_DST_ALPHA) || |
| (fs==GGL_ONE_MINUS_SRC_ALPHA && fd==GGL_SRC_ALPHA); |
| |
| |
| // XXX: we could also optimize these cases: |
| // R = S*f + D*f = (S+D)*f |
| // R = S*(1-f) + D*(1-f) = (S+D)*(1-f) |
| // R = S*D + D*S = 2*S*D |
| |
| |
| // see if we need to extract 'component' from the destination (fb) |
| integer_t fb; |
| if (blending & (BLEND_DST|FACTOR_DST)) { |
| fb.setTo(scratches.obtain(), 32); |
| extract(fb, pixel, component); |
| if (mDithering) { |
| // XXX: maybe what we should do instead, is simply |
| // expand fb -or- fragment to the larger of the two |
| if (fb.size() < temp.size()) { |
| // for now we expand 'fb' to min(fragment, 8) |
| int new_size = temp.size() < 8 ? temp.size() : 8; |
| expand(fb, fb, new_size); |
| } |
| } |
| } |
| |
| |
| // convert input fragment to integer_t |
| if (temp.l && (temp.flags & CORRUPTIBLE)) { |
| MOV(AL, 0, temp.reg, reg_imm(temp.reg, LSR, temp.l)); |
| temp.h -= temp.l; |
| temp.l = 0; |
| } |
| integer_t fragment(temp.reg, temp.size(), temp.flags); |
| |
| // if not done yet, convert input fragment to integer_t |
| if (temp.l) { |
| // here we know temp is not CORRUPTIBLE |
| fragment.reg = scratches.obtain(); |
| MOV(AL, 0, fragment.reg, reg_imm(temp.reg, LSR, temp.l)); |
| fragment.flags |= CORRUPTIBLE; |
| } |
| |
| if (!(temp.flags & CORRUPTIBLE)) { |
| // temp is not corruptible, but since it's the destination it |
| // will be modified, so we need to allocate a new register. |
| temp.reg = regs.obtain(); |
| temp.flags &= ~CORRUPTIBLE; |
| fragment.flags &= ~CORRUPTIBLE; |
| } |
| |
| if ((blending & BLEND_SRC) && !same_factor_opt1) { |
| // source (fragment) is needed for the blending stage |
| // so it's not CORRUPTIBLE (unless we're doing same_factor_opt1) |
| fragment.flags &= ~CORRUPTIBLE; |
| } |
| |
| |
| if (same_factor_opt1) { |
| // R = S*f + D*(1-f) = (S-D)*f + D |
| integer_t factor; |
| build_blend_factor(factor, fs, |
| component, pixel, fragment, fb, scratches); |
| // fb is always corruptible from this point |
| fb.flags |= CORRUPTIBLE; |
| build_blendFOneMinusF(temp, factor, fragment, fb); |
| } else if (same_factor_opt2) { |
| // R = S*(1-f) + D*f = (D-S)*f + S |
| integer_t factor; |
| // fb is always corrruptible here |
| fb.flags |= CORRUPTIBLE; |
| build_blend_factor(factor, fd, |
| component, pixel, fragment, fb, scratches); |
| build_blendOneMinusFF(temp, factor, fragment, fb); |
| } else { |
| integer_t src_factor; |
| integer_t dst_factor; |
| |
| // if destination (fb) is not needed for the blending stage, |
| // then it can be marked as CORRUPTIBLE |
| if (!(blending & BLEND_DST)) { |
| fb.flags |= CORRUPTIBLE; |
| } |
| |
| // XXX: try to mark some registers as CORRUPTIBLE |
| // in most case we could make those corruptible |
| // when we're processing the last component |
| // but not always, for instance |
| // when fragment is constant and not reloaded |
| // when fb is needed for logic-ops or masking |
| // when a register is aliased (for instance with mAlphaSource) |
| |
| // blend away... |
| if (fs==GGL_ZERO) { |
| if (fd==GGL_ZERO) { // R = 0 |
| // already taken care of |
| } else if (fd==GGL_ONE) { // R = D |
| // already taken care of |
| } else { // R = D*fd |
| // compute fd |
| build_blend_factor(dst_factor, fd, |
| component, pixel, fragment, fb, scratches); |
| mul_factor(temp, fb, dst_factor); |
| } |
| } else if (fs==GGL_ONE) { |
| if (fd==GGL_ZERO) { // R = S |
| // NOP, taken care of |
| } else if (fd==GGL_ONE) { // R = S + D |
| component_add(temp, fb, fragment); // args order matters |
| component_sat(temp); |
| } else { // R = S + D*fd |
| // compute fd |
| build_blend_factor(dst_factor, fd, |
| component, pixel, fragment, fb, scratches); |
| mul_factor_add(temp, fb, dst_factor, component_t(fragment)); |
| component_sat(temp); |
| } |
| } else { |
| // compute fs |
| build_blend_factor(src_factor, fs, |
| component, pixel, fragment, fb, scratches); |
| if (fd==GGL_ZERO) { // R = S*fs |
| mul_factor(temp, fragment, src_factor); |
| } else if (fd==GGL_ONE) { // R = S*fs + D |
| mul_factor_add(temp, fragment, src_factor, component_t(fb)); |
| component_sat(temp); |
| } else { // R = S*fs + D*fd |
| mul_factor(temp, fragment, src_factor); |
| if (scratches.isUsed(src_factor.reg)) |
| scratches.recycle(src_factor.reg); |
| // compute fd |
| build_blend_factor(dst_factor, fd, |
| component, pixel, fragment, fb, scratches); |
| mul_factor_add(temp, fb, dst_factor, temp); |
| if (!same_factor_opt1 && !same_factor_opt2) { |
| component_sat(temp); |
| } |
| } |
| } |
| } |
| |
| // now we can be corrupted (it's the dest) |
| temp.flags |= CORRUPTIBLE; |
| } |
| |
| void GGLAssembler::build_blend_factor( |
| integer_t& factor, int f, int component, |
| const pixel_t& dst_pixel, |
| integer_t& fragment, |
| integer_t& fb, |
| Scratch& scratches) |
| { |
| integer_t src_alpha(fragment); |
| |
| // src_factor/dst_factor won't be used after blending, |
| // so it's fine to mark them as CORRUPTIBLE (if not aliased) |
| factor.flags |= CORRUPTIBLE; |
| |
| switch(f) { |
| case GGL_ONE_MINUS_SRC_ALPHA: |
| case GGL_SRC_ALPHA: |
| if (component==GGLFormat::ALPHA && !isAlphaSourceNeeded()) { |
| // we're processing alpha, so we already have |
| // src-alpha in fragment, and we need src-alpha just this time. |
| } else { |
| // alpha-src will be needed for other components |
| if (!mBlendFactorCached || mBlendFactorCached==f) { |
| src_alpha = mAlphaSource; |
| factor = mAlphaSource; |
| factor.flags &= ~CORRUPTIBLE; |
| // we already computed the blend factor before, nothing to do. |
| if (mBlendFactorCached) |
| return; |
| // this is the first time, make sure to compute the blend |
| // factor properly. |
| mBlendFactorCached = f; |
| break; |
| } else { |
| // we have a cached alpha blend factor, but we want another one, |
| // this should really not happen because by construction, |
| // we cannot have BOTH source and destination |
| // blend factors use ALPHA *and* ONE_MINUS_ALPHA (because |
| // the blending stage uses the f/(1-f) optimization |
| |
| // for completeness, we handle this case though. Since there |
| // are only 2 choices, this meens we want "the other one" |
| // (1-factor) |
| factor = mAlphaSource; |
| factor.flags &= ~CORRUPTIBLE; |
| RSB(AL, 0, factor.reg, factor.reg, imm((1<<factor.s))); |
| mBlendFactorCached = f; |
| return; |
| } |
| } |
| // fall-through... |
| case GGL_ONE_MINUS_DST_COLOR: |
| case GGL_DST_COLOR: |
| case GGL_ONE_MINUS_SRC_COLOR: |
| case GGL_SRC_COLOR: |
| case GGL_ONE_MINUS_DST_ALPHA: |
| case GGL_DST_ALPHA: |
| case GGL_SRC_ALPHA_SATURATE: |
| // help us find out what register we can use for the blend-factor |
| // CORRUPTIBLE registers are chosen first, or a new one is allocated. |
| if (fragment.flags & CORRUPTIBLE) { |
| factor.setTo(fragment.reg, 32, CORRUPTIBLE); |
| fragment.flags &= ~CORRUPTIBLE; |
| } else if (fb.flags & CORRUPTIBLE) { |
| factor.setTo(fb.reg, 32, CORRUPTIBLE); |
| fb.flags &= ~CORRUPTIBLE; |
| } else { |
| factor.setTo(scratches.obtain(), 32, CORRUPTIBLE); |
| } |
| break; |
| } |
| |
| // XXX: doesn't work if size==1 |
| |
| switch(f) { |
| case GGL_ONE_MINUS_DST_COLOR: |
| case GGL_DST_COLOR: |
| factor.s = fb.s; |
| ADD(AL, 0, factor.reg, fb.reg, reg_imm(fb.reg, LSR, fb.s-1)); |
| break; |
| case GGL_ONE_MINUS_SRC_COLOR: |
| case GGL_SRC_COLOR: |
| factor.s = fragment.s; |
| ADD(AL, 0, factor.reg, fragment.reg, |
| reg_imm(fragment.reg, LSR, fragment.s-1)); |
| break; |
| case GGL_ONE_MINUS_SRC_ALPHA: |
| case GGL_SRC_ALPHA: |
| factor.s = src_alpha.s; |
| ADD(AL, 0, factor.reg, src_alpha.reg, |
| reg_imm(src_alpha.reg, LSR, src_alpha.s-1)); |
| break; |
| case GGL_ONE_MINUS_DST_ALPHA: |
| case GGL_DST_ALPHA: |
| // XXX: should be precomputed |
| extract(factor, dst_pixel, GGLFormat::ALPHA); |
| ADD(AL, 0, factor.reg, factor.reg, |
| reg_imm(factor.reg, LSR, factor.s-1)); |
| break; |
| case GGL_SRC_ALPHA_SATURATE: |
| // XXX: should be precomputed |
| // XXX: f = min(As, 1-Ad) |
| // btw, we're guaranteed that Ad's size is <= 8, because |
| // it's extracted from the framebuffer |
| break; |
| } |
| |
| switch(f) { |
| case GGL_ONE_MINUS_DST_COLOR: |
| case GGL_ONE_MINUS_SRC_COLOR: |
| case GGL_ONE_MINUS_DST_ALPHA: |
| case GGL_ONE_MINUS_SRC_ALPHA: |
| RSB(AL, 0, factor.reg, factor.reg, imm((1<<factor.s))); |
| } |
| |
| // don't need more than 8-bits for the blend factor |
| // and this will prevent overflows in the multiplies later |
| if (factor.s > 8) { |
| MOV(AL, 0, factor.reg, reg_imm(factor.reg, LSR, factor.s-8)); |
| factor.s = 8; |
| } |
| } |
| |
| int GGLAssembler::blending_codes(int fs, int fd) |
| { |
| int blending = 0; |
| switch(fs) { |
| case GGL_ONE: |
| blending |= BLEND_SRC; |
| break; |
| |
| case GGL_ONE_MINUS_DST_COLOR: |
| case GGL_DST_COLOR: |
| blending |= FACTOR_DST|BLEND_SRC; |
| break; |
| case GGL_ONE_MINUS_DST_ALPHA: |
| case GGL_DST_ALPHA: |
| // no need to extract 'component' from the destination |
| // for the blend factor, because we need ALPHA only. |
| blending |= BLEND_SRC; |
| break; |
| |
| case GGL_ONE_MINUS_SRC_COLOR: |
| case GGL_SRC_COLOR: |
| blending |= FACTOR_SRC|BLEND_SRC; |
| break; |
| case GGL_ONE_MINUS_SRC_ALPHA: |
| case GGL_SRC_ALPHA: |
| case GGL_SRC_ALPHA_SATURATE: |
| blending |= FACTOR_SRC|BLEND_SRC; |
| break; |
| } |
| switch(fd) { |
| case GGL_ONE: |
| blending |= BLEND_DST; |
| break; |
| |
| case GGL_ONE_MINUS_DST_COLOR: |
| case GGL_DST_COLOR: |
| blending |= FACTOR_DST|BLEND_DST; |
| break; |
| case GGL_ONE_MINUS_DST_ALPHA: |
| case GGL_DST_ALPHA: |
| blending |= FACTOR_DST|BLEND_DST; |
| break; |
| |
| case GGL_ONE_MINUS_SRC_COLOR: |
| case GGL_SRC_COLOR: |
| blending |= FACTOR_SRC|BLEND_DST; |
| break; |
| case GGL_ONE_MINUS_SRC_ALPHA: |
| case GGL_SRC_ALPHA: |
| // no need to extract 'component' from the source |
| // for the blend factor, because we need ALPHA only. |
| blending |= BLEND_DST; |
| break; |
| } |
| return blending; |
| } |
| |
| // --------------------------------------------------------------------------- |
| |
| void GGLAssembler::build_blendFOneMinusF( |
| component_t& temp, |
| const integer_t& factor, |
| const integer_t& fragment, |
| const integer_t& fb) |
| { |
| // R = S*f + D*(1-f) = (S-D)*f + D |
| Scratch scratches(registerFile()); |
| // compute S-D |
| integer_t diff(fragment.flags & CORRUPTIBLE ? |
| fragment.reg : scratches.obtain(), fb.size(), CORRUPTIBLE); |
| const int shift = fragment.size() - fb.size(); |
| if (shift>0) RSB(AL, 0, diff.reg, fb.reg, reg_imm(fragment.reg, LSR, shift)); |
| else if (shift<0) RSB(AL, 0, diff.reg, fb.reg, reg_imm(fragment.reg, LSL,-shift)); |
| else RSB(AL, 0, diff.reg, fb.reg, fragment.reg); |
| mul_factor_add(temp, diff, factor, component_t(fb)); |
| } |
| |
| void GGLAssembler::build_blendOneMinusFF( |
| component_t& temp, |
| const integer_t& factor, |
| const integer_t& fragment, |
| const integer_t& fb) |
| { |
| // R = S*f + D*(1-f) = (S-D)*f + D |
| Scratch scratches(registerFile()); |
| // compute D-S |
| integer_t diff(fb.flags & CORRUPTIBLE ? |
| fb.reg : scratches.obtain(), fb.size(), CORRUPTIBLE); |
| const int shift = fragment.size() - fb.size(); |
| if (shift>0) SUB(AL, 0, diff.reg, fb.reg, reg_imm(fragment.reg, LSR, shift)); |
| else if (shift<0) SUB(AL, 0, diff.reg, fb.reg, reg_imm(fragment.reg, LSL,-shift)); |
| else SUB(AL, 0, diff.reg, fb.reg, fragment.reg); |
| mul_factor_add(temp, diff, factor, component_t(fragment)); |
| } |
| |
| // --------------------------------------------------------------------------- |
| |
| void GGLAssembler::mul_factor( component_t& d, |
| const integer_t& v, |
| const integer_t& f) |
| { |
| int vs = v.size(); |
| int fs = f.size(); |
| int ms = vs+fs; |
| |
| // XXX: we could have special cases for 1 bit mul |
| |
| // all this code below to use the best multiply instruction |
| // wrt the parameters size. We take advantage of the fact |
| // that the 16-bits multiplies allow a 16-bit shift |
| // The trick is that we just make sure that we have at least 8-bits |
| // per component (which is enough for a 8 bits display). |
| |
| int xy; |
| int vshift = 0; |
| int fshift = 0; |
| int smulw = 0; |
| |
| if (vs<16) { |
| if (fs<16) { |
| xy = xyBB; |
| } else if (GGL_BETWEEN(fs, 24, 31)) { |
| ms -= 16; |
| xy = xyTB; |
| } else { |
| // eg: 15 * 18 -> 15 * 15 |
| fshift = fs - 15; |
| ms -= fshift; |
| xy = xyBB; |
| } |
| } else if (GGL_BETWEEN(vs, 24, 31)) { |
| if (fs<16) { |
| ms -= 16; |
| xy = xyTB; |
| } else if (GGL_BETWEEN(fs, 24, 31)) { |
| ms -= 32; |
| xy = xyTT; |
| } else { |
| // eg: 24 * 18 -> 8 * 18 |
| fshift = fs - 15; |
| ms -= 16 + fshift; |
| xy = xyTB; |
| } |
| } else { |
| if (fs<16) { |
| // eg: 18 * 15 -> 15 * 15 |
| vshift = vs - 15; |
| ms -= vshift; |
| xy = xyBB; |
| } else if (GGL_BETWEEN(fs, 24, 31)) { |
| // eg: 18 * 24 -> 15 * 8 |
| vshift = vs - 15; |
| ms -= 16 + vshift; |
| xy = xyBT; |
| } else { |
| // eg: 18 * 18 -> (15 * 18)>>16 |
| fshift = fs - 15; |
| ms -= 16 + fshift; |
| xy = yB; //XXX SMULWB |
| smulw = 1; |
| } |
| } |
| |
| ALOGE_IF(ms>=32, "mul_factor overflow vs=%d, fs=%d", vs, fs); |
| |
| int vreg = v.reg; |
| int freg = f.reg; |
| if (vshift) { |
| MOV(AL, 0, d.reg, reg_imm(vreg, LSR, vshift)); |
| vreg = d.reg; |
| } |
| if (fshift) { |
| MOV(AL, 0, d.reg, reg_imm(vreg, LSR, fshift)); |
| freg = d.reg; |
| } |
| if (smulw) SMULW(AL, xy, d.reg, vreg, freg); |
| else SMUL(AL, xy, d.reg, vreg, freg); |
| |
| |
| d.h = ms; |
| if (mDithering) { |
| d.l = 0; |
| } else { |
| d.l = fs; |
| d.flags |= CLEAR_LO; |
| } |
| } |
| |
| void GGLAssembler::mul_factor_add( component_t& d, |
| const integer_t& v, |
| const integer_t& f, |
| const component_t& a) |
| { |
| // XXX: we could have special cases for 1 bit mul |
| Scratch scratches(registerFile()); |
| |
| int vs = v.size(); |
| int fs = f.size(); |
| int as = a.h; |
| int ms = vs+fs; |
| |
| ALOGE_IF(ms>=32, "mul_factor_add overflow vs=%d, fs=%d, as=%d", vs, fs, as); |
| |
| integer_t add(a.reg, a.h, a.flags); |
| |
| // 'a' is a component_t but it is guaranteed to have |
| // its high bits set to 0. However in the dithering case, |
| // we can't get away with truncating the potentially bad bits |
| // so extraction is needed. |
| |
| if ((mDithering) && (a.size() < ms)) { |
| // we need to expand a |
| if (!(a.flags & CORRUPTIBLE)) { |
| // ... but it's not corruptible, so we need to pick a |
| // temporary register. |
| // Try to uses the destination register first (it's likely |
| // to be usable, unless it aliases an input). |
| if (d.reg!=a.reg && d.reg!=v.reg && d.reg!=f.reg) { |
| add.reg = d.reg; |
| } else { |
| add.reg = scratches.obtain(); |
| } |
| } |
| expand(add, a, ms); // extracts and expands |
| as = ms; |
| } |
| |
| if (ms == as) { |
| if (vs<16 && fs<16) SMLABB(AL, d.reg, v.reg, f.reg, add.reg); |
| else MLA(AL, 0, d.reg, v.reg, f.reg, add.reg); |
| } else { |
| int temp = d.reg; |
| if (temp == add.reg) { |
| // the mul will modify add.reg, we need an intermediary reg |
| if (v.flags & CORRUPTIBLE) temp = v.reg; |
| else if (f.flags & CORRUPTIBLE) temp = f.reg; |
| else temp = scratches.obtain(); |
| } |
| |
| if (vs<16 && fs<16) SMULBB(AL, temp, v.reg, f.reg); |
| else MUL(AL, 0, temp, v.reg, f.reg); |
| |
| if (ms>as) { |
| ADD(AL, 0, d.reg, temp, reg_imm(add.reg, LSL, ms-as)); |
| } else if (ms<as) { |
| // not sure if we should expand the mul instead? |
| ADD(AL, 0, d.reg, temp, reg_imm(add.reg, LSR, as-ms)); |
| } |
| } |
| |
| d.h = ms; |
| if (mDithering) { |
| d.l = a.l; |
| } else { |
| d.l = fs>a.l ? fs : a.l; |
| d.flags |= CLEAR_LO; |
| } |
| } |
| |
| void GGLAssembler::component_add(component_t& d, |
| const integer_t& dst, const integer_t& src) |
| { |
| // here we're guaranteed that fragment.size() >= fb.size() |
| const int shift = src.size() - dst.size(); |
| if (!shift) { |
| ADD(AL, 0, d.reg, src.reg, dst.reg); |
| } else { |
| ADD(AL, 0, d.reg, src.reg, reg_imm(dst.reg, LSL, shift)); |
| } |
| |
| d.h = src.size(); |
| if (mDithering) { |
| d.l = 0; |
| } else { |
| d.l = shift; |
| d.flags |= CLEAR_LO; |
| } |
| } |
| |
| void GGLAssembler::component_sat(const component_t& v) |
| { |
| const int one = ((1<<v.size())-1)<<v.l; |
| CMP(AL, v.reg, imm( 1<<v.h )); |
| if (isValidImmediate(one)) { |
| MOV(HS, 0, v.reg, imm( one )); |
| } else if (isValidImmediate(~one)) { |
| MVN(HS, 0, v.reg, imm( ~one )); |
| } else { |
| MOV(HS, 0, v.reg, imm( 1<<v.h )); |
| SUB(HS, 0, v.reg, v.reg, imm( 1<<v.l )); |
| } |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| }; // namespace android |
| |
