GLShader.cpp
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GLShader.cpp
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	#include <echo/Platforms/GL/GLShader.h>
	#include <echo/Graphics/Shader.h>

	#ifdef ECHO_GL_SUPPORTS_VERTEX_SHADER

	namespace Echo
	{
	GLShader::GLShader(GLenum shaderType) : mVersion(0)
	{
	mShaderHandle = glCreateShader(shaderType);
	}

	GLShader::~GLShader()
	{
	glDeleteShader(mShaderHandle);
	}

	bool GLShader::Compile(const Shader& shader)
	{
	if (shader.GetSource().empty())
	return false;

	const char* source = shader.GetSource().c_str();
	glShaderSource(mShaderHandle, 1, (const GLchar**)&source, 0);
	glCompileShader(mShaderHandle);

	int compiled = 0;
	glGetObjectParameterivARB(mShaderHandle, GL_OBJECT_COMPILE_STATUS_ARB, &compiled);
	if (compiled)
	{
	mVersion=shader.GetVersion();
	return true;
	}else
	{
	mVersion=0;
	}
	return false;
	}

	std::string GLShader::GetErrors()
	{
	if (mShaderHandle==0)
	return "";

	GLint logLength = 0;
	glGetObjectParameterivARB(mShaderHandle, GL_OBJECT_INFO_LOG_LENGTH_ARB , &logLength);
	if (logLength > 1)
	{
	char* compilerLog = new char[logLength];
	GLint outLogLength = 0;
	glGetInfoLogARB(mShaderHandle, logLength, &outLogLength, compilerLog);
	std::string logAsString(compilerLog);
	delete [] compilerLog;
	return logAsString;
	}
	return "";
	}
	}
	#endif