diff options
| -rw-r--r-- | src/gallium/drivers/svga/svga_link.c | 120 | ||||
| -rw-r--r-- | src/gallium/drivers/svga/svga_link.h | 20 |
2 files changed, 140 insertions, 0 deletions
diff --git a/src/gallium/drivers/svga/svga_link.c b/src/gallium/drivers/svga/svga_link.c new file mode 100644 index 00000000000..f3e524d38ea --- /dev/null +++ b/src/gallium/drivers/svga/svga_link.c @@ -0,0 +1,120 @@ +/*/ + * Copyright 2013 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, sublicense, 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 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 + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * 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 "svga_context.h" +#include "svga_link.h" + +#include "tgsi/tgsi_strings.h" + + +#define INVALID_INDEX 255 + + +/** + * Examine input and output shaders info to link outputs from the + * output shader to inputs from the input shader. + * Basically, we'll remap input shader's input slots to new numbers + * based on semantic name/index of the outputs from the output shader. + */ +void +svga_link_shaders(const struct tgsi_shader_info *outshader_info, + const struct tgsi_shader_info *inshader_info, + struct shader_linkage *linkage) +{ + unsigned i, free_slot; + + for (i = 0; i < Elements(linkage->input_map); i++) { + linkage->input_map[i] = INVALID_INDEX; + } + + /* Assign input slots for input shader inputs. + * Basically, we want to use the same index for the output shader's outputs + * and the input shader's inputs that should be linked together. + * We'll modify the input shader's inputs to match the output shader. + */ + assert(inshader_info->num_inputs <= + Elements(inshader_info->input_semantic_name)); + + /* free register index that can be used for built-in varyings */ + free_slot = outshader_info->num_outputs + 1; + + for (i = 0; i < inshader_info->num_inputs; i++) { + unsigned sem_name = inshader_info->input_semantic_name[i]; + unsigned sem_index = inshader_info->input_semantic_index[i]; + unsigned j; + /** + * Get the clip distance inputs from the output shader's + * clip distance shadow copy. + */ + if (sem_name == TGSI_SEMANTIC_CLIPDIST) { + linkage->input_map[i] = outshader_info->num_outputs + 1 + sem_index; + /* make sure free_slot includes this extra output */ + free_slot = MAX2(free_slot, linkage->input_map[i] + 1); + } + else { + /* search output shader outputs for same item */ + for (j = 0; j < outshader_info->num_outputs; j++) { + assert(j < Elements(outshader_info->output_semantic_name)); + if (outshader_info->output_semantic_name[j] == sem_name && + outshader_info->output_semantic_index[j] == sem_index) { + linkage->input_map[i] = j; + break; + } + } + } + } + + linkage->num_inputs = inshader_info->num_inputs; + + /* Things like the front-face register are handled here */ + for (i = 0; i < inshader_info->num_inputs; i++) { + if (linkage->input_map[i] == INVALID_INDEX) { + unsigned j = free_slot++; + linkage->input_map[i] = j; + } + } + + /* Debug */ + if (0) { + unsigned reg = 0; + for (i = 0; i < linkage->num_inputs; i++) { + + assert(linkage->input_map[i] != INVALID_INDEX); + + debug_printf("input shader input[%d] slot %u %s %u %s\n", + i, + linkage->input_map[i], + tgsi_semantic_names[inshader_info->input_semantic_name[i]], + inshader_info->input_semantic_index[i], + tgsi_interpolate_names[inshader_info->input_interpolate[i]]); + + /* make sure no repeating register index */ + if (reg & 1 << linkage->input_map[i]) { + assert(0); + } + reg |= 1 << linkage->input_map[i]; + } + } +} diff --git a/src/gallium/drivers/svga/svga_link.h b/src/gallium/drivers/svga/svga_link.h new file mode 100644 index 00000000000..724c61194a2 --- /dev/null +++ b/src/gallium/drivers/svga/svga_link.h @@ -0,0 +1,20 @@ + +#ifndef SVGA_LINK_H +#define SVGA_LINK_H + +#include "pipe/p_defines.h" + +struct svga_context; + +struct shader_linkage +{ + unsigned num_inputs; + ubyte input_map[PIPE_MAX_SHADER_INPUTS]; +}; + +void +svga_link_shaders(const struct tgsi_shader_info *outshader_info, + const struct tgsi_shader_info *inshader_info, + struct shader_linkage *linkage); + +#endif /* SVGA_LINK_H */ |