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      1 /*
      2  * Copyright  2019 Alyssa Rosenzweig
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     21  * IN THE SOFTWARE.
     22  *
     23  */
     24 
     25 #ifndef NIR_BLEND_H
     26 #define NIR_BLEND_H
     27 
     28 #include "compiler/nir/nir.h"
     29 #include "pipe/p_format.h"
     30 
     31 /* These structs encapsulates the blend state such that it can be lowered
     32  * cleanly
     33  */
     34 
     35 typedef struct {
     36    enum blend_func func;
     37 
     38    enum blend_factor src_factor;
     39    bool invert_src_factor;
     40 
     41    enum blend_factor dst_factor;
     42    bool invert_dst_factor;
     43 } nir_lower_blend_channel;
     44 
     45 typedef struct {
     46    nir_lower_blend_channel rgb;
     47    nir_lower_blend_channel alpha;
     48 
     49    /* 4-bit colormask. 0x0 for none, 0xF for RGBA, 0x1 for R */
     50    unsigned colormask;
     51 } nir_lower_blend_rt;
     52 
     53 typedef struct {
     54    nir_lower_blend_rt rt[8];
     55    enum pipe_format format[8];
     56 
     57    bool logicop_enable;
     58    unsigned logicop_func;
     59 
     60    nir_ssa_def *src1;
     61 
     62    /* If set, will use load_blend_const_color_{r,g,b,a}_float instead of
     63     * load_blend_const_color_rgba */
     64    bool scalar_blend_const;
     65 } nir_lower_blend_options;
     66 
     67 void nir_lower_blend(nir_shader *shader, nir_lower_blend_options options);
     68 
     69 #endif
     70