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/*
* Copyright 2011-2016 Branimir Karadzic. All rights reserved.
* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
*/
#include "shaderc.h"
#include "glsl_optimizer.h"
namespace bgfx
{
bool compileGLSLShader(bx::CommandLine& _cmdLine, uint32_t _gles, const std::string& _code, bx::WriterI* _writer)
{
char ch = tolower(_cmdLine.findOption('\0', "type")[0]);
const glslopt_shader_type type = ch == 'f'
? kGlslOptShaderFragment
: (ch == 'c' ? kGlslOptShaderCompute : kGlslOptShaderVertex);
glslopt_target target = kGlslTargetOpenGL;
switch (_gles)
{
case BX_MAKEFOURCC('M', 'T', 'L', 0):
target = kGlslTargetMetal;
break;
case 2:
target = kGlslTargetOpenGLES20;
break;
case 3:
target = kGlslTargetOpenGLES30;
break;
default:
target = kGlslTargetOpenGL;
break;
}
glslopt_ctx* ctx = glslopt_initialize(target);
glslopt_shader* shader = glslopt_optimize(ctx, type, _code.c_str(), 0);
if (!glslopt_get_status(shader) )
{
const char* log = glslopt_get_log(shader);
int32_t source = 0;
int32_t line = 0;
int32_t column = 0;
int32_t start = 0;
int32_t end = INT32_MAX;
if (3 == sscanf(log, "%u:%u(%u):", &source, &line, &column)
&& 0 != line)
{
start = bx::uint32_imax(1, line-10);
end = start + 20;
}
printCode(_code.c_str(), line, start, end);
fprintf(stderr, "Error: %s\n", log);
glslopt_cleanup(ctx);
return false;
}
const char* optimizedShader = glslopt_get_output(shader);
// Trim all directives.
while ('#' == *optimizedShader)
{
optimizedShader = bx::strnl(optimizedShader);
}
if (0 != _gles)
{
char* code = const_cast<char*>(optimizedShader);
strReplace(code, "gl_FragDepthEXT", "gl_FragDepth");
strReplace(code, "texture2DLodEXT", "texture2DLod");
strReplace(code, "texture2DProjLodEXT", "texture2DProjLod");
strReplace(code, "textureCubeLodEXT", "textureCubeLod");
strReplace(code, "texture2DGradEXT", "texture2DGrad");
strReplace(code, "texture2DProjGradEXT", "texture2DProjGrad");
strReplace(code, "textureCubeGradEXT", "textureCubeGrad");
strReplace(code, "shadow2DEXT", "shadow2D");
strReplace(code, "shadow2DProjEXT", "shadow2DProj");
}
UniformArray uniforms;
{
const char* parse = optimizedShader;
while (NULL != parse
&& *parse != '\0')
{
parse = bx::strws(parse);
const char* eol = strchr(parse, ';');
if (NULL != eol)
{
const char* qualifier = parse;
parse = bx::strws(bx::strword(parse) );
if (0 == strncmp(qualifier, "attribute", 9)
|| 0 == strncmp(qualifier, "varying", 7) )
{
// skip attributes and varyings.
parse = eol + 1;
continue;
}
if (0 != strncmp(qualifier, "uniform", 7) )
{
// end if there is no uniform keyword.
parse = NULL;
continue;
}
const char* precision = NULL;
const char* typen = parse;
if (0 == strncmp(typen, "lowp", 4)
|| 0 == strncmp(typen, "mediump", 7)
|| 0 == strncmp(typen, "highp", 5) )
{
precision = typen;
typen = parse = bx::strws(bx::strword(parse) );
}
BX_UNUSED(precision);
char uniformType[256];
parse = bx::strword(parse);
if (0 == strncmp(typen, "sampler", 7) )
{
strcpy(uniformType, "int");
}
else
{
bx::strlcpy(uniformType, typen, parse-typen+1);
}
const char* name = parse = bx::strws(parse);
char uniformName[256];
uint8_t num = 1;
const char* array = bx::strnstr(name, "[", eol-parse);
if (NULL != array)
{
bx::strlcpy(uniformName, name, array-name+1);
char arraySize[32];
const char* end = bx::strnstr(array, "]", eol-array);
bx::strlcpy(arraySize, array+1, end-array);
num = atoi(arraySize);
}
else
{
bx::strlcpy(uniformName, name, eol-name+1);
}
Uniform un;
un.type = nameToUniformTypeEnum(uniformType);
if (UniformType::Count != un.type)
{
BX_TRACE("name: %s (type %d, num %d)", uniformName, un.type, num);
un.name = uniformName;
un.num = num;
un.regIndex = 0;
un.regCount = num;
uniforms.push_back(un);
}
parse = eol + 1;
}
}
}
uint16_t count = (uint16_t)uniforms.size();
bx::write(_writer, count);
for (UniformArray::const_iterator it = uniforms.begin(); it != uniforms.end(); ++it)
{
const Uniform& un = *it;
uint8_t nameSize = (uint8_t)un.name.size();
bx::write(_writer, nameSize);
bx::write(_writer, un.name.c_str(), nameSize);
uint8_t uniformType = un.type;
bx::write(_writer, uniformType);
bx::write(_writer, un.num);
bx::write(_writer, un.regIndex);
bx::write(_writer, un.regCount);
BX_TRACE("%s, %s, %d, %d, %d"
, un.name.c_str()
, getUniformTypeName(un.type)
, un.num
, un.regIndex
, un.regCount
);
}
uint32_t shaderSize = (uint32_t)strlen(optimizedShader);
bx::write(_writer, shaderSize);
bx::write(_writer, optimizedShader, shaderSize);
uint8_t nul = 0;
bx::write(_writer, nul);
glslopt_cleanup(ctx);
return true;
}
} // namespace bgfx
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