#pragma once

#define XRES 1280
#define YRES 720

typedef HGLRC (WINAPI *PFNWGLCREATECONTEXTATTRIBSARBPROC) (HDC hDC, HGLRC hShareContext, const int *attribList);
typedef void (WINAPI *GLDEBUGPROCAMD)(GLuint id,GLenum category,GLenum severity,GLsizei length,const GLchar *message,GLvoid *userParam);
typedef void (WINAPI *PFNGLDEBUGMESSAGECALLBACKAMDPROC) (GLDEBUGPROCAMD callback, GLvoid *userParam);

PFNGLCREATEPROGRAMPROC glCreateProgram;
PFNGLCREATESHADERPROC glCreateShader;
PFNGLSHADERSOURCEPROC glShaderSource;
PFNGLCOMPILESHADERPROC glCompileShader;
PFNGLATTACHSHADERPROC glAttachShader;
PFNGLLINKPROGRAMPROC glLinkProgram;
PFNGLUSEPROGRAMPROC glUseProgram;
PFNGLGENVERTEXARRAYSPROC glGenVertexArrays;
PFNGLBINDVERTEXARRAYPROC glBindVertexArray;
PFNGLGENBUFFERSPROC glGenBuffers;
PFNGLBUFFERDATAPROC glBufferData;
PFNGLMAPBUFFERPROC glMapBuffer;
PFNGLUNMAPBUFFERPROC glUnmapBuffer;
PFNGLBINDBUFFERPROC glBindBuffer;
PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray;
PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer;
PFNGLGETATTRIBLOCATIONPROC glGetAttribLocation;

#pragma data_seg(".screenSettings")
static DEVMODE screenSettings = {{0}, 0, 0, sizeof(DEVMODE), 0, 0x001c0000, {0}, 0, 0, 0, 0, 0, {0}, 0, 32, XRES, YRES, {0}, 0};

#pragma data_seg(".pfd")
static const PIXELFORMATDESCRIPTOR pfd = {0, 1, PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER, PFD_TYPE_RGBA, 32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8};

#pragma code_seg(".compile")
unsigned int __cdecl compileShader(const char* vsh, const char* fsh)
{
	GLuint s,p;
	p = glCreateProgram();
	s = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(s, 1, &vsh, NULL);
	glCompileShader(s);
	glAttachShader(p, s);
	s = glCreateShader(GL_FRAGMENT_SHADER);	
	glShaderSource(s, 1, &fsh, NULL);
	glCompileShader(s);
	glAttachShader(p, s);
	glLinkProgram(p);
	glUseProgram(p);
	return p;
};

#ifdef _DEBUG
void APIENTRY glDebugOutputAMD(GLuint id, GLenum category, GLenum severity, GLsizei length, const GLchar* message, GLvoid* userParam)
{
	OutputDebugStringA("[");

	if (severity == GL_DEBUG_SEVERITY_HIGH_AMD)
		OutputDebugStringA("high");
	else if (severity == GL_DEBUG_SEVERITY_MEDIUM_AMD)
		OutputDebugStringA("medium");
	else if (severity == GL_DEBUG_SEVERITY_LOW_AMD)
		OutputDebugStringA("low");

	OutputDebugStringA("] ");

	if (category == GL_DEBUG_CATEGORY_API_ERROR_AMD)
		OutputDebugStringA("api error");
	else if (category == GL_DEBUG_CATEGORY_WINDOW_SYSTEM_AMD)
		OutputDebugStringA("window system");
	else if (category == GL_DEBUG_CATEGORY_DEPRECATION_AMD)
		OutputDebugStringA("deprecation");
	else if (category == GL_DEBUG_CATEGORY_UNDEFINED_BEHAVIOR_AMD)
		OutputDebugStringA("undefined behavior");
	else if (category == GL_DEBUG_CATEGORY_PERFORMANCE_AMD)
		OutputDebugStringA("performance");
	else if (category == GL_DEBUG_CATEGORY_SHADER_COMPILER_AMD)
		OutputDebugStringA("shader compiler");
	else if (category == GL_DEBUG_CATEGORY_APPLICATION_AMD)
		OutputDebugStringA("application");
	else if (category == GL_DEBUG_CATEGORY_OTHER_AMD)
		OutputDebugStringA("other");

	OutputDebugStringA(": ");
	OutputDebugStringA(message);
	OutputDebugStringA("\n");

	DebugBreak();
}
#endif

#pragma data_seg(".attribs")
static const int attribs[] =
{
	WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
	WGL_CONTEXT_MINOR_VERSION_ARB, 3,
#ifdef _DEBUG
	WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB | WGL_CONTEXT_DEBUG_BIT_ARB,
#else
	WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
#endif
	0
};