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#include <exception>
#include "Runtime/Debug/log.h"
#include "Shader.h"
#include "OpenGL.h"
#include "ShaderCompiler.h"
using namespace std;
std::string shaderError = "";
void checkCompileshaderErrorors(GLuint shader, std::string type)
{
GLint success;
GLchar infoLog[1024];
if (type != "PROGRAM")
{
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(shader, 1024, NULL, infoLog);
shaderError = "ERROR::SHADER_COMPILATION_ERROR of type: " + type + "\n" + infoLog;
}
}
else
{
glGetProgramiv(shader, GL_LINK_STATUS, &success);
if (!success)
{
glGetProgramInfoLog(shader, 1024, NULL, infoLog);
shaderError = "ERROR::SHADER_COMPILATION_ERROR of type: " + type + "\n" + infoLog;
}
}
if (!success)
{
throw ShaderCompileExecption(shaderError.c_str());
}
}
Shader::Shader()
: NativeClass<Shader>()
{
}
Shader::Shader(LuaBind::VM*vm)
: NativeClass<Shader>(vm)
{
}
Shader::Shader(LuaBind::VM*vm, std::string& glslShader)
: NativeClass<Shader>(vm)
{
// stl的string会在大小超过阈值的情况下在栈里分配，并用RAII保证释放
std::string vsh ;
std::string fsh ;
try
{
GLSLCompiler::Compile(glslShader, vsh, fsh, m_Commands);
}
catch (GLSLCompileException& e)
{
ReleaseRenderCommandGroup(m_Commands);
throw ShaderCompileExecption(e.what());
}
CompileProgram(vsh.c_str(), fsh.c_str());
}
Shader::Shader(LuaBind::VM* vm, const char* vert, const char* frag)
: NativeClass<Shader>(vm)
{
CompileProgram(vert, frag);
}
void Shader::CompileProgram(const char* vert, const char* frag, bool keepSrc)
{
const char* vertCode = vert;
const char* fragCode = frag;
// vertex shader
m_VertID = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(m_VertID, 1, &vertCode, NULL);//为了支持中文注释，长度传NULL
glCompileShader(m_VertID);
checkCompileshaderErrorors(m_VertID, "VERTEX");
// fragment Shader
m_FragID = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(m_FragID, 1, &fragCode, NULL);
glCompileShader(m_FragID);
checkCompileshaderErrorors(m_FragID, "FRAGMENT");
// create program
m_ProgramID = glCreateProgram();
glAttachShader(m_ProgramID, m_VertID);
glAttachShader(m_ProgramID, m_FragID);
glLinkProgram(m_ProgramID);
checkCompileshaderErrorors(m_FragID, "PROGRAM");
}
Shader::~Shader()
{
glDeleteProgram(m_ProgramID);
glDeleteShader(m_VertID);
glDeleteShader(m_FragID);
}
void Shader::ReCompile(std::string& vert, std::string frag)
{
const char* vertCode = vert.c_str();
const char* fragCode = frag.c_str();
// vertex shader
glShaderSource(m_VertID, 1, &vertCode, NULL);
glCompileShader(m_VertID);
checkCompileshaderErrorors(m_VertID, "VERTEX");
// fragment Shader
glShaderSource(m_FragID, 1, &fragCode, NULL);
glCompileShader(m_FragID);
checkCompileshaderErrorors(m_FragID, "FRAGMENT");
// create program
glAttachShader(m_ProgramID, m_VertID);
glAttachShader(m_ProgramID, m_FragID);
glLinkProgram(m_ProgramID);
checkCompileshaderErrorors(m_FragID, "PROGRAM");
}
void Shader::ReCompileVert(std::string& vert)
{
glDeleteShader(m_VertID);
const char* vertCode = vert.c_str();
// vertex shader
glShaderSource(m_VertID, 1, &vertCode, NULL);
glCompileShader(m_VertID);
checkCompileshaderErrorors(m_VertID, "VERTEX");
// create program
glAttachShader(m_ProgramID, m_VertID);
glAttachShader(m_ProgramID, m_FragID);
glLinkProgram(m_ProgramID);
checkCompileshaderErrorors(m_FragID, "PROGRAM");
}
void Shader::ReCompileFrag(std::string frag)
{
glDeleteShader(m_FragID);
const char* fragCode = frag.c_str();
// fragment Shader
glShaderSource(m_FragID, 1, &fragCode, NULL);
glCompileShader(m_FragID);
checkCompileshaderErrorors(m_FragID, "FRAGMENT");
// create program
glAttachShader(m_ProgramID, m_VertID);
glAttachShader(m_ProgramID, m_FragID);
glLinkProgram(m_ProgramID);
checkCompileshaderErrorors(m_FragID, "PROGRAM");
}
bool Shader::IsValid()
{
return m_ProgramID != 0;
}
void Shader::ExecuteCommand()
{
for (int i = 0; i < m_Commands.size(); ++i)
{
m_Commands[i]->Execute();
}
}
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