mirror of https://github.com/bkaradzic/bgfx
405 lines
11 KiB
C++
405 lines
11 KiB
C++
/*
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* Copyright 2011-2024 Branimir Karadzic. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
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*/
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#include "shaderc.h"
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#include "glsl_optimizer.h"
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namespace bgfx { namespace glsl
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{
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static bool compile(const Options& _options, uint32_t _version, const std::string& _code, bx::WriterI* _shaderWriter, bx::WriterI* _messageWriter)
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{
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bx::ErrorAssert messageErr;
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char ch = _options.shaderType;
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const glslopt_shader_type type = ch == 'f'
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? kGlslOptShaderFragment
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: (ch == 'c' ? kGlslOptShaderCompute : kGlslOptShaderVertex);
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glslopt_target target = kGlslTargetOpenGL;
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if(_version == BX_MAKEFOURCC('M', 'T', 'L', 0))
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{
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target = kGlslTargetMetal;
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} else if(_version < 0x80000000) {
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target = kGlslTargetOpenGL;
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}
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else {
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_version &= ~0x80000000;
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target = (_version >= 300) ? kGlslTargetOpenGLES30 : kGlslTargetOpenGLES20;
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}
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glslopt_ctx* ctx = glslopt_initialize(target);
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glslopt_shader* shader = glslopt_optimize(ctx, type, _code.c_str(), 0);
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if (!glslopt_get_status(shader) )
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{
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const char* log = glslopt_get_log(shader);
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int32_t source = 0;
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int32_t line = 0;
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int32_t column = 0;
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int32_t start = 0;
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int32_t end = INT32_MAX;
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bool found = false
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|| 3 == sscanf(log, "%u:%u(%u):", &source, &line, &column)
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|| 2 == sscanf(log, "(%u,%u):", &line, &column)
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;
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if (found
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&& 0 != line)
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{
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start = bx::uint32_imax(1, line-10);
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end = start + 20;
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}
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printCode(_code.c_str(), line, start, end, column);
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bx::write(_messageWriter, &messageErr, "Error: %s\n", log);
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glslopt_shader_delete(shader);
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glslopt_cleanup(ctx);
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return false;
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}
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const char* optimizedShader = glslopt_get_output(shader);
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std::string out;
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// Trim all directives.
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while ('#' == *optimizedShader)
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{
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optimizedShader = bx::strFindNl(optimizedShader).getPtr();
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}
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out.append(optimizedShader, strlen(optimizedShader));
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optimizedShader = out.c_str();
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{
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char* code = const_cast<char*>(optimizedShader);
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strReplace(code, "gl_FragDepthEXT", "gl_FragDepth");
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strReplace(code, "textureLodEXT", "texture2DLod");
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strReplace(code, "textureGradEXT", "texture2DGrad");
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strReplace(code, "texture2DLodARB", "texture2DLod");
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strReplace(code, "texture2DLodEXT", "texture2DLod");
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strReplace(code, "texture2DGradARB", "texture2DGrad");
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strReplace(code, "texture2DGradEXT", "texture2DGrad");
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strReplace(code, "textureCubeLodARB", "textureCubeLod");
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strReplace(code, "textureCubeLodEXT", "textureCubeLod");
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strReplace(code, "textureCubeGradARB", "textureCubeGrad");
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strReplace(code, "textureCubeGradEXT", "textureCubeGrad");
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strReplace(code, "texture2DProjLodARB", "texture2DProjLod");
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strReplace(code, "texture2DProjLodEXT", "texture2DProjLod");
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strReplace(code, "texture2DProjGradARB", "texture2DProjGrad");
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strReplace(code, "texture2DProjGradEXT", "texture2DProjGrad");
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strReplace(code, "shadow2DARB", "shadow2D");
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strReplace(code, "shadow2DEXT", "shadow2D");
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strReplace(code, "shadow2DProjARB", "shadow2DProj");
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strReplace(code, "shadow2DProjEXT", "shadow2DProj");
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}
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UniformArray uniforms;
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if (target != kGlslTargetMetal)
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{
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bx::StringView parse(optimizedShader);
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while (!parse.isEmpty() )
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{
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parse = bx::strLTrimSpace(parse);
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bx::StringView eol = bx::strFind(parse, ';');
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if (!eol.isEmpty() )
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{
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bx::StringView qualifier = nextWord(parse);
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if (0 == bx::strCmp(qualifier, "precision", 9) )
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{
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// skip precision
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parse.set(eol.getPtr() + 1, parse.getTerm() );
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continue;
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}
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if (0 == bx::strCmp(qualifier, "attribute", 9)
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|| 0 == bx::strCmp(qualifier, "varying", 7)
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|| 0 == bx::strCmp(qualifier, "in", 2)
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|| 0 == bx::strCmp(qualifier, "out", 3)
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)
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{
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// skip attributes and varyings.
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parse.set(eol.getPtr() + 1, parse.getTerm() );
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continue;
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}
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if (0 == bx::strCmp(qualifier, "flat", 4)
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|| 0 == bx::strCmp(qualifier, "smooth", 6)
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|| 0 == bx::strCmp(qualifier, "noperspective", 13)
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|| 0 == bx::strCmp(qualifier, "centroid", 8)
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)
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{
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// skip interpolation qualifiers
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parse.set(eol.getPtr() + 1, parse.getTerm() );
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continue;
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}
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if (0 == bx::strCmp(parse, "tmpvar", 6) )
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{
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// skip temporaries
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parse.set(eol.getPtr() + 1, parse.getTerm() );
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continue;
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}
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if (0 != bx::strCmp(qualifier, "uniform", 7) )
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{
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// end if there is no uniform keyword.
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parse.clear();
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continue;
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}
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bx::StringView precision;
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bx::StringView typen = nextWord(parse);
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if (0 == bx::strCmp(typen, "lowp", 4)
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|| 0 == bx::strCmp(typen, "mediump", 7)
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|| 0 == bx::strCmp(typen, "highp", 5) )
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{
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precision = typen;
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typen = nextWord(parse);
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}
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BX_UNUSED(precision);
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char uniformType[256];
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if (0 == bx::strCmp(typen, "sampler", 7)
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|| 0 == bx::strCmp(typen, "isampler", 8)
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|| 0 == bx::strCmp(typen, "usampler", 8) )
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{
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bx::strCopy(uniformType, BX_COUNTOF(uniformType), "int");
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}
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else
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{
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bx::strCopy(uniformType, BX_COUNTOF(uniformType), typen);
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}
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bx::StringView name = nextWord(parse);
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uint8_t num = 1;
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bx::StringView array = bx::strSubstr(parse, 0, 1);
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if (0 == bx::strCmp(array, "[", 1) )
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{
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parse = bx::strLTrimSpace(bx::StringView(parse.getPtr() + 1, parse.getTerm() ) );
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uint32_t tmp;
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bx::fromString(&tmp, parse);
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num = uint8_t(tmp);
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}
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Uniform un;
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un.type = nameToUniformTypeEnum(uniformType);
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if (UniformType::Count != un.type)
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{
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un.name.assign(name.getPtr(), name.getTerm());
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BX_TRACE("name: %s (type %d, num %d)", un.name.c_str(), un.type, num);
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un.num = num;
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un.regIndex = 0;
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un.regCount = num;
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switch (un.type)
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{
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case UniformType::Mat3:
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un.regCount *= 3;
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break;
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case UniformType::Mat4:
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un.regCount *= 4;
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break;
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default:
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break;
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}
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uniforms.push_back(un);
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}
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parse = bx::strLTrimSpace(bx::strFindNl(bx::StringView(eol.getPtr(), parse.getTerm() ) ) );
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}
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}
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}
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else
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{
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const bx::StringView optShader(optimizedShader);
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bx::StringView parse = bx::strFind(optimizedShader, "struct xlatMtlShaderUniform {");
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bx::StringView end = parse;
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if (!parse.isEmpty() )
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{
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parse.set(parse.getPtr() + bx::strLen("struct xlatMtlShaderUniform {"), optShader.getTerm() );
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end = bx::strFind(parse, "};");
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}
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while ( parse.getPtr() < end.getPtr()
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&& !parse.isEmpty() )
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{
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parse.set(bx::strLTrimSpace(parse).getPtr(), optShader.getTerm() );
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const bx::StringView eol = bx::strFind(parse, ';');
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if (!eol.isEmpty() )
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{
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const char* typen = parse.getPtr();
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char uniformType[256];
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parse = bx::strWord(parse);
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bx::strCopy(uniformType, parse.getLength()+1, typen);
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parse.set(parse.getPtr()+parse.getLength(),optShader.getTerm());
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const char* name = bx::strLTrimSpace(parse).getPtr();
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parse.set(name, optShader.getTerm() );
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char uniformName[256];
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uint8_t num = 1;
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bx::StringView array = bx::strFind(bx::StringView(name, int32_t(eol.getPtr()-parse.getPtr() ) ), "[");
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if (!array.isEmpty() )
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{
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bx::strCopy(uniformName, int32_t(array.getPtr()-name+1), name);
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char arraySize[32];
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bx::StringView arrayEnd = bx::strFind(bx::StringView(array.getPtr(), int32_t(eol.getPtr()-array.getPtr() ) ), "]");
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bx::strCopy(arraySize, int32_t(arrayEnd.getPtr()-array.getPtr() ), array.getPtr()+1);
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uint32_t tmp;
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bx::fromString(&tmp, arraySize);
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num = uint8_t(tmp);
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}
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else
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{
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bx::strCopy(uniformName, int32_t(eol.getPtr()-name+1), name);
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}
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Uniform un;
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un.type = nameToUniformTypeEnum(uniformType);
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if (UniformType::Count != un.type)
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{
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BX_TRACE("name: %s (type %d, num %d)", uniformName, un.type, num);
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un.name = uniformName;
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un.num = num;
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un.regIndex = 0;
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un.regCount = num;
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uniforms.push_back(un);
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}
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parse = eol.getPtr() + 1;
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}
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}
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bx::StringView mainEntry("xlatMtlShaderOutput xlatMtlMain (");
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parse = bx::strFind(optimizedShader, mainEntry);
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end = parse;
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if (!parse.isEmpty())
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{
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parse.set(parse.getPtr() + mainEntry.getLength(), optShader.getTerm());
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end = bx::strFind(parse, "{");
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}
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while (parse.getPtr() < end.getPtr()
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&& !parse.isEmpty())
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{
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parse.set(bx::strLTrimSpace(parse).getPtr(), optShader.getTerm());
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const bx::StringView textureNameMark("[[texture(");
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const bx::StringView textureName = bx::strFind(parse, textureNameMark);
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if (!textureName.isEmpty())
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{
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Uniform un;
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un.type = nameToUniformTypeEnum("int"); // int for sampler
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const char* varNameEnd = textureName.getPtr() - 1;
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parse.set(parse.getPtr(), varNameEnd - 1);
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const char* varNameBeg = parse.getPtr();
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for (int ii = parse.getLength() - 1; 0 <= ii; --ii)
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{
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if (varNameBeg[ii] == ' ')
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{
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parse.set(varNameBeg + ii + 1, varNameEnd);
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break;
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}
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}
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char uniformName[256];
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bx::strCopy(uniformName, parse.getLength() + 1, parse);
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un.name = uniformName;
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const char* regIndexBeg = textureName.getPtr() + textureNameMark.getLength();
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bx::StringView regIndex = bx::strFind(regIndexBeg, ")");
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regIndex.set(regIndexBeg, regIndex.getPtr());
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uint32_t tmp;
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bx::fromString(&tmp, regIndex);
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un.regIndex = uint16_t(tmp);
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un.num = 1;
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un.regCount = 1;
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uniforms.push_back(un);
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parse = regIndex.getPtr() + 1;
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}
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else
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{
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parse = textureName;
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}
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}
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}
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bx::ErrorAssert err;
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uint16_t count = (uint16_t)uniforms.size();
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bx::write(_shaderWriter, count, &err);
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for (UniformArray::const_iterator it = uniforms.begin(); it != uniforms.end(); ++it)
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{
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const Uniform& un = *it;
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uint8_t nameSize = (uint8_t)un.name.size();
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bx::write(_shaderWriter, nameSize, &err);
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bx::write(_shaderWriter, un.name.c_str(), nameSize, &err);
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uint8_t uniformType = uint8_t(un.type);
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bx::write(_shaderWriter, uniformType, &err);
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bx::write(_shaderWriter, un.num, &err);
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bx::write(_shaderWriter, un.regIndex, &err);
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bx::write(_shaderWriter, un.regCount, &err);
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bx::write(_shaderWriter, un.texComponent, &err);
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bx::write(_shaderWriter, un.texDimension, &err);
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bx::write(_shaderWriter, un.texFormat, &err);
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BX_TRACE("%s, %s, %d, %d, %d"
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, un.name.c_str()
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, getUniformTypeName(un.type)
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, un.num
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, un.regIndex
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, un.regCount
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);
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}
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uint32_t shaderSize = (uint32_t)bx::strLen(optimizedShader);
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bx::write(_shaderWriter, shaderSize, &err);
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bx::write(_shaderWriter, optimizedShader, shaderSize, &err);
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uint8_t nul = 0;
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bx::write(_shaderWriter, nul, &err);
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if (_options.disasm )
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{
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std::string disasmfp = _options.outputFilePath + ".disasm";
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writeFile(disasmfp.c_str(), optimizedShader, shaderSize);
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}
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glslopt_shader_delete(shader);
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glslopt_cleanup(ctx);
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return true;
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}
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} // namespace glsl
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bool compileGLSLShader(const Options& _options, uint32_t _version, const std::string& _code, bx::WriterI* _shaderWriter, bx::WriterI* _messageWriter)
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{
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return glsl::compile(_options, _version, _code, _shaderWriter, _messageWriter);
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}
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} // namespace bgfx
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