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#include <stdio.h>
#include "glfuncs.h"

// Function pointers (loaded via SDL_GL_GetProcAddress)
PFNGLCREATESHADERPROC glCreateShader = NULL;
PFNGLSHADERSOURCEPROC glShaderSource = NULL;
PFNGLCOMPILESHADERPROC glCompileShader = NULL;
PFNGLCREATEPROGRAMPROC glCreateProgram = NULL;
PFNGLATTACHSHADERPROC glAttachShader = NULL;
PFNGLLINKPROGRAMPROC glLinkProgram = NULL;
PFNGLUSEPROGRAMPROC glUseProgram = NULL;
PFNGLGENVERTEXARRAYSPROC glGenVertexArrays = NULL;
PFNGLBINDVERTEXARRAYPROC glBindVertexArray = NULL;
PFNGLGENBUFFERSPROC glGenBuffers = NULL;
PFNGLBINDBUFFERPROC glBindBuffer = NULL;
PFNGLBUFFERDATAPROC glBufferData = NULL;
PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer = NULL;
PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray = NULL;
PFNGLDISABLEVERTEXATTRIBARRAYPROC glDisableVertexAttribArray = NULL;
PFNGLDELETEPROGRAMPROC glDeleteProgram = NULL;
PFNGLDELETESHADERPROC glDeleteShader = NULL;
PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation = NULL;
PFNGLUNIFORMMATRIX4FVPROC glUniformMatrix4fv = NULL;
PFNGLDELETEBUFFERSPROC glDeleteBuffers;
PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays;
PFNGLUNIFORM3FVPROC glUniform3fv = NULL;
PFNGLUNIFORM3FPROC glUniform3f = NULL;
PFNGLGETPROGRAMIVPROC glGetProgramiv = NULL;
PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog = NULL;
PFNGLGETSHADERIVPROC glGetShaderiv = NULL;
PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog = NULL;
PFNGLGETSHADERSOURCEPROC glGetShaderSource = NULL;
PFNGLUNIFORM2FPROC glUniform2f = NULL;
PFNGLUNIFORM1FPROC glUniform1f = NULL;
PFNGLUNIFORM1IPROC glUniform1i = NULL;
PFNGLUNIFORM4FPROC glUniform4f = NULL;
PFNGLGENFRAMEBUFFERSPROC        glGenFramebuffers = NULL;
PFNGLBINDFRAMEBUFFERPROC        glBindFramebuffer = NULL;
PFNGLCHECKFRAMEBUFFERSTATUSPROC glCheckFramebufferStatus = NULL;
PFNGLFRAMEBUFFERTEXTURE2DPROC   glFramebufferTexture2D = NULL;
PFNGLDELETEFRAMEBUFFERSPROC     glDeleteFramebuffers = NULL;

// Load SDL3 function pointers
void Glfuncs_load() {
    glCreateShader        = (PFNGLCREATESHADERPROC)SDL_GL_GetProcAddress("glCreateShader");
    glShaderSource        = (PFNGLSHADERSOURCEPROC)SDL_GL_GetProcAddress("glShaderSource");
    glCompileShader       = (PFNGLCOMPILESHADERPROC)SDL_GL_GetProcAddress("glCompileShader");
    glCreateProgram       = (PFNGLCREATEPROGRAMPROC)SDL_GL_GetProcAddress("glCreateProgram");
    glAttachShader        = (PFNGLATTACHSHADERPROC)SDL_GL_GetProcAddress("glAttachShader");
    glLinkProgram         = (PFNGLLINKPROGRAMPROC)SDL_GL_GetProcAddress("glLinkProgram");
    glUseProgram          = (PFNGLUSEPROGRAMPROC)SDL_GL_GetProcAddress("glUseProgram");
    glGenVertexArrays     = (PFNGLGENVERTEXARRAYSPROC)SDL_GL_GetProcAddress("glGenVertexArrays");
    glBindVertexArray     = (PFNGLBINDVERTEXARRAYPROC)SDL_GL_GetProcAddress("glBindVertexArray");
    glGenBuffers          = (PFNGLGENBUFFERSPROC)SDL_GL_GetProcAddress("glGenBuffers");
    glBindBuffer          = (PFNGLBINDBUFFERPROC)SDL_GL_GetProcAddress("glBindBuffer");
    glBufferData          = (PFNGLBUFFERDATAPROC)SDL_GL_GetProcAddress("glBufferData");
    glVertexAttribPointer = (PFNGLVERTEXATTRIBPOINTERPROC)SDL_GL_GetProcAddress("glVertexAttribPointer");
    glEnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)SDL_GL_GetProcAddress("glEnableVertexAttribArray");
    glDisableVertexAttribArray = (PFNGLDISABLEVERTEXATTRIBARRAYPROC)SDL_GL_GetProcAddress("glDisableVertexAttribArray");
    glDeleteShader        = (PFNGLDELETESHADERPROC)SDL_GL_GetProcAddress("glDeleteShader");
    glDeleteProgram       = (PFNGLDELETEPROGRAMPROC)SDL_GL_GetProcAddress("glDeleteProgram");
    glGetUniformLocation  = (PFNGLGETUNIFORMLOCATIONPROC)SDL_GL_GetProcAddress("glGetUniformLocation");
    glUniformMatrix4fv    = (PFNGLUNIFORMMATRIX4FVPROC)SDL_GL_GetProcAddress("glUniformMatrix4fv");
    glDeleteBuffers       = (PFNGLDELETEBUFFERSPROC)SDL_GL_GetProcAddress("glDeleteBuffers");
    glDeleteVertexArrays  = (PFNGLDELETEVERTEXARRAYSPROC)SDL_GL_GetProcAddress("glDeleteVertexArrays");
    glUniform3fv          = (PFNGLUNIFORM3FVPROC)SDL_GL_GetProcAddress("glUniform3fv");
    glUniform3f           = (PFNGLUNIFORM3FPROC)SDL_GL_GetProcAddress("glUniform3f");
    glGetProgramiv        = (PFNGLGETPROGRAMIVPROC)SDL_GL_GetProcAddress("glGetProgramiv");
    glGetProgramInfoLog   = (PFNGLGETPROGRAMINFOLOGPROC )SDL_GL_GetProcAddress("glGetProgramInfoLog");
    glGetShaderiv         = (PFNGLGETSHADERIVPROC)SDL_GL_GetProcAddress("glGetShaderiv");
    glGetShaderInfoLog    = (PFNGLGETSHADERINFOLOGPROC)SDL_GL_GetProcAddress("glGetShaderInfoLog");
    glGetShaderSource     = (PFNGLGETSHADERSOURCEPROC)SDL_GL_GetProcAddress("glGetShaderSource");
    glUniform2f           = (PFNGLUNIFORM2FPROC)SDL_GL_GetProcAddress("glUniform2f");
    glUniform1f           = (PFNGLUNIFORM1FPROC)SDL_GL_GetProcAddress("glUniform1f");
    glUniform1i           = (PFNGLUNIFORM1IPROC)SDL_GL_GetProcAddress("glUniform1i");
    glUniform4f           = (PFNGLUNIFORM4FPROC)SDL_GL_GetProcAddress("glUniform4f");
    glGenFramebuffers     = (PFNGLGENFRAMEBUFFERSPROC)SDL_GL_GetProcAddress("glGenFramebuffers");
    glBindFramebuffer     = (PFNGLBINDFRAMEBUFFERPROC)SDL_GL_GetProcAddress("glBindFramebuffer");
    glCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC)SDL_GL_GetProcAddress("glCheckFramebufferStatus");
    glFramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC)SDL_GL_GetProcAddress("glFramebufferTexture2D");
    glDeleteFramebuffers   = (PFNGLDELETEFRAMEBUFFERSPROC)SDL_GL_GetProcAddress("glDeleteFramebuffers");
}