mirror of
https://github.com/libretro/RetroArch.git
synced 2024-11-26 17:50:56 +00:00
291 lines
6.8 KiB
C++
291 lines
6.8 KiB
C++
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2016 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <string>
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#include <sstream>
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#include <streams/file_stream.h>
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#include <lists/string_list.h>
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#include "glslang_util.hpp"
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#include "glslang.hpp"
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#include "../../general.h"
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#include "../../libretro-common/include/file/file_path.h"
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using namespace std;
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static bool read_shader_file(const char *path, vector<string> *output)
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{
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char *buf = nullptr;
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ssize_t len = 0;
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struct string_list *list = NULL;
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char include_path[PATH_MAX];
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if (filestream_read_file(path, (void**)&buf, &len) < 0)
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{
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RARCH_ERR("Failed to open shader file: \"%s\".\n", path);
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return false;
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}
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list = string_split(buf, "\n");
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if (!list)
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{
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free(buf);
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return false;
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}
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if (list->size == 0)
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{
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free(buf);
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string_list_free(list);
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return false;
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}
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for (size_t i = 0; i < list->size; i++)
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{
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const char *line = list->elems[i].data;
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if (strstr(line, "#include ") == line)
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{
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char *c = (char*)strchr(line, '"');
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if (!c)
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{
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RARCH_ERR("Invalid include statement \"%s\".\n", line);
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return false;
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}
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c++;
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char *closing = (char*)strchr(c, '"');
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if (!closing)
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{
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RARCH_ERR("Invalid include statement \"%s\".\n", line);
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return false;
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}
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*closing = '\0';
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fill_pathname_resolve_relative(include_path, path, c, sizeof(include_path));
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if (!read_shader_file(include_path, output))
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return false;
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}
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else
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output->push_back(line);
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}
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string_list_free(list);
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return true;
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}
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static string build_stage_source(const vector<string> &lines, const char *stage)
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{
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ostringstream str;
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bool active = true;
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// Version header.
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str << lines.front();
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str << '\n';
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for (auto itr = begin(lines) + 1; itr != end(lines); ++itr)
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{
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if (itr->find("#pragma stage ") == 0)
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{
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if (stage)
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{
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auto expected = string("#pragma stage ") + stage;
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active = itr->find(expected) != string::npos;
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}
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// Improve debuggability.
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if (active)
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{
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str << "#line ";
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str << (itr - begin(lines)) + 2;
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str << '\n';
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}
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}
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else if (itr->find("#pragma name ") == 0 ||
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itr->find("#pragma format ") == 0)
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{
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// Ignore
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}
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else if (active)
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str << *itr;
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str << '\n';
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}
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return str.str();
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}
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static const char *glslang_formats[] = {
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"R8_UNORM",
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"R8_UINT",
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"R8_SINT",
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"R8G8_UNORM",
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"R8G8_UINT",
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"R8G8_SINT",
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"R8G8B8A8_UNORM",
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"R8G8B8A8_UINT",
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"R8G8B8A8_SINT",
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"R8G8B8A8_SRGB",
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"A2B10G10R10_UNORM_PACK32",
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"A2B10G10R10_UINT_PACK32",
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"R16_UINT",
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"R16_SINT",
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"R16_SFLOAT",
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"R16G16_UINT",
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"R16G16_SINT",
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"R16G16_SFLOAT",
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"R16G16B16A16_UINT",
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"R16G16B16A16_SINT",
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"R16G16B16A16_SFLOAT",
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"R32_UINT",
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"R32_SINT",
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"R32_SFLOAT",
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"R32G32_UINT",
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"R32G32_SINT",
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"R32G32_SFLOAT",
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"R32G32B32A32_UINT",
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"R32G32B32A32_SINT",
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"R32G32B32A32_SFLOAT",
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"UNKNOWN",
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};
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const char *glslang_format_to_string(enum glslang_format fmt)
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{
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return glslang_formats[fmt];
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}
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static glslang_format glslang_find_format(const char *fmt)
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{
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#undef FMT
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#define FMT(x) if (!strcmp(fmt, #x)) return SLANG_FORMAT_ ## x
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FMT(R8_UNORM);
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FMT(R8_UINT);
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FMT(R8_SINT);
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FMT(R8G8_UNORM);
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FMT(R8G8_UINT);
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FMT(R8G8_SINT);
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FMT(R8G8B8A8_UNORM);
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FMT(R8G8B8A8_UINT);
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FMT(R8G8B8A8_SINT);
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FMT(R8G8B8A8_SRGB);
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FMT(A2B10G10R10_UNORM_PACK32);
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FMT(A2B10G10R10_UINT_PACK32);
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FMT(R16_UINT);
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FMT(R16_SINT);
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FMT(R16_SFLOAT);
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FMT(R16G16_UINT);
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FMT(R16G16_SINT);
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FMT(R16G16_SFLOAT);
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FMT(R16G16B16A16_UINT);
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FMT(R16G16B16A16_SINT);
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FMT(R16G16B16A16_SFLOAT);
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FMT(R32_UINT);
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FMT(R32_SINT);
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FMT(R32_SFLOAT);
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FMT(R32G32_UINT);
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FMT(R32G32_SINT);
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FMT(R32G32_SFLOAT);
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FMT(R32G32B32A32_UINT);
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FMT(R32G32B32A32_SINT);
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FMT(R32G32B32A32_SFLOAT);
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return SLANG_FORMAT_UNKNOWN;
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}
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static bool glslang_parse_meta(const vector<string> &lines, glslang_meta *meta)
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{
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*meta = glslang_meta{};
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for (auto &line : lines)
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{
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if (line.find("#pragma name ") == 0)
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{
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if (!meta->name.empty())
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{
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RARCH_ERR("[slang]: Trying to declare multiple names for file.\n");
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return false;
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}
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const char *str = line.c_str() + strlen("#pragma name ");
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while (*str == ' ')
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str++;
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meta->name = str;
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}
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else if (line.find("#pragma format ") == 0)
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{
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if (meta->rt_format != SLANG_FORMAT_UNKNOWN)
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{
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RARCH_ERR("[slang]: Trying to declare format multiple times for file.\n");
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return false;
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}
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const char *str = line.c_str() + strlen("#pragma format ");
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while (*str == ' ')
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str++;
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meta->rt_format = glslang_find_format(str);
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if (meta->rt_format == SLANG_FORMAT_UNKNOWN)
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{
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RARCH_ERR("[slang]: Failed to find format \"%s\".\n", str);
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return false;
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}
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}
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}
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return true;
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}
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bool glslang_compile_shader(const char *shader_path, glslang_output *output)
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{
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vector<string> lines;
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RARCH_LOG("[slang]: Compiling shader \"%s\".\n", shader_path);
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if (!read_shader_file(shader_path, &lines))
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return false;
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if (!glslang_parse_meta(lines, &output->meta))
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return false;
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auto &header = lines.front();
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if (header.find_first_of("#version ") != 0)
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{
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RARCH_ERR("First line of the shader must contain a valid #version string.\n");
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return false;
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}
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if (!glslang::compile_spirv(build_stage_source(lines, "vertex"),
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glslang::StageVertex, &output->vertex))
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{
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RARCH_ERR("Failed to compile vertex shader stage.\n");
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return false;
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}
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if (!glslang::compile_spirv(build_stage_source(lines, "fragment"),
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glslang::StageFragment, &output->fragment))
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{
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RARCH_ERR("Failed to compile fragment shader stage.\n");
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return false;
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}
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return true;
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}
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