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| /************************************************************************** |
| * |
| * Copyright 2012 VMware, Inc. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sub license, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial portions |
| * of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
| * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
| * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| **************************************************************************/ |
| |
| #include "pipe/p_state.h" |
| #include "util/u_debug.h" |
| |
| #include "gallivm/lp_bld_type.h" |
| #include "gallivm/lp_bld_arit.h" |
| |
| #include "lp_bld_blend.h" |
| |
| /** |
| * Is (a OP b) == (b OP a)? |
| */ |
| boolean |
| lp_build_blend_func_commutative(unsigned func) |
| { |
| switch (func) { |
| case PIPE_BLEND_ADD: |
| case PIPE_BLEND_MIN: |
| case PIPE_BLEND_MAX: |
| return TRUE; |
| case PIPE_BLEND_SUBTRACT: |
| case PIPE_BLEND_REVERSE_SUBTRACT: |
| return FALSE; |
| default: |
| assert(0); |
| return TRUE; |
| } |
| } |
| |
| |
| /** |
| * Whether the blending functions are the reverse of each other. |
| */ |
| boolean |
| lp_build_blend_func_reverse(unsigned rgb_func, unsigned alpha_func) |
| { |
| if(rgb_func == alpha_func) |
| return FALSE; |
| if(rgb_func == PIPE_BLEND_SUBTRACT && alpha_func == PIPE_BLEND_REVERSE_SUBTRACT) |
| return TRUE; |
| if(rgb_func == PIPE_BLEND_REVERSE_SUBTRACT && alpha_func == PIPE_BLEND_SUBTRACT) |
| return TRUE; |
| return FALSE; |
| } |
| |
| |
| /** |
| * Whether the blending factors are complementary of each other. |
| */ |
| static INLINE boolean |
| lp_build_blend_factor_complementary(unsigned src_factor, unsigned dst_factor) |
| { |
| return dst_factor == (src_factor ^ 0x10); |
| } |
| |
| |
| /** |
| * @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendEquationSeparate.xml |
| */ |
| LLVMValueRef |
| lp_build_blend_func(struct lp_build_context *bld, |
| unsigned func, |
| LLVMValueRef term1, |
| LLVMValueRef term2) |
| { |
| switch (func) { |
| case PIPE_BLEND_ADD: |
| return lp_build_add(bld, term1, term2); |
| case PIPE_BLEND_SUBTRACT: |
| return lp_build_sub(bld, term1, term2); |
| case PIPE_BLEND_REVERSE_SUBTRACT: |
| return lp_build_sub(bld, term2, term1); |
| case PIPE_BLEND_MIN: |
| return lp_build_min(bld, term1, term2); |
| case PIPE_BLEND_MAX: |
| return lp_build_max(bld, term1, term2); |
| default: |
| assert(0); |
| return bld->zero; |
| } |
| } |
| |
| |
| /** |
| * Performs optimisations and blending independent of SoA/AoS |
| * |
| * @param func the blend function |
| * @param factor_src PIPE_BLENDFACTOR_xxx |
| * @param factor_dst PIPE_BLENDFACTOR_xxx |
| * @param src source rgba |
| * @param dst dest rgba |
| * @param src_factor src factor computed value |
| * @param dst_factor dst factor computed value |
| * @param not_alpha_dependent same factors accross all channels of src/dst |
| * |
| * not_alpha_dependent should be: |
| * SoA: always true as it is only one channel at a time |
| * AoS: rgb_src_factor == alpha_src_factor && rgb_dst_factor == alpha_dst_factor |
| * |
| * Note that pretty much every possible optimisation can only be done on non-unorm targets |
| * due to unorm values not going above 1.0 meaning factorisation can change results. |
| * e.g. (0.9 * 0.9) + (0.9 * 0.9) != 0.9 * (0.9 + 0.9) as result of + is always <= 1. |
| */ |
| LLVMValueRef |
| lp_build_blend(struct lp_build_context *bld, |
| unsigned func, |
| unsigned factor_src, |
| unsigned factor_dst, |
| LLVMValueRef src, |
| LLVMValueRef dst, |
| LLVMValueRef src_factor, |
| LLVMValueRef dst_factor, |
| boolean not_alpha_dependent, |
| boolean optimise_only) |
| { |
| LLVMValueRef result, src_term, dst_term; |
| |
| /* If we are not alpha dependent we can mess with the src/dst factors */ |
| if (not_alpha_dependent) { |
| if (lp_build_blend_factor_complementary(factor_src, factor_dst)) { |
| if (func == PIPE_BLEND_ADD) { |
| if (factor_src < factor_dst) { |
| return lp_build_lerp(bld, src_factor, dst, src, 0); |
| } else { |
| return lp_build_lerp(bld, dst_factor, src, dst, 0); |
| } |
| } else if(bld->type.floating && func == PIPE_BLEND_SUBTRACT) { |
| result = lp_build_add(bld, src, dst); |
| |
| if (factor_src < factor_dst) { |
| result = lp_build_mul(bld, result, src_factor); |
| return lp_build_sub(bld, result, dst); |
| } else { |
| result = lp_build_mul(bld, result, dst_factor); |
| return lp_build_sub(bld, src, result); |
| } |
| } else if(bld->type.floating && func == PIPE_BLEND_REVERSE_SUBTRACT) { |
| result = lp_build_add(bld, src, dst); |
| |
| if (factor_src < factor_dst) { |
| result = lp_build_mul(bld, result, src_factor); |
| return lp_build_sub(bld, dst, result); |
| } else { |
| result = lp_build_mul(bld, result, dst_factor); |
| return lp_build_sub(bld, result, src); |
| } |
| } |
| } |
| |
| if (bld->type.floating && factor_src == factor_dst) { |
| if (func == PIPE_BLEND_ADD || |
| func == PIPE_BLEND_SUBTRACT || |
| func == PIPE_BLEND_REVERSE_SUBTRACT) { |
| LLVMValueRef result; |
| result = lp_build_blend_func(bld, func, src, dst); |
| return lp_build_mul(bld, result, src_factor); |
| } |
| } |
| } |
| |
| if (optimise_only) |
| return NULL; |
| |
| src_term = lp_build_mul(bld, src, src_factor); |
| dst_term = lp_build_mul(bld, dst, dst_factor); |
| return lp_build_blend_func(bld, func, src_term, dst_term); |
| } |