// OpenGL 3.3 Core — runtime-loaded function pointers
// No #library needed — caller provides a loader (e.g. SDL_GL_GetProcAddress)

// Constants
GL_FALSE             :s32: 0;
GL_TRUE              :s32: 1;
GL_DEPTH_TEST        :u32: 0x0B71;
GL_CULL_FACE         :u32: 0x0B44;
GL_BLEND             :u32: 0x0BE2;
GL_TRIANGLES         :u32: 4;
GL_LINES             :u32: 1;
GL_FLOAT             :u32: 0x1406;
GL_UNSIGNED_INT      :u32: 0x1405;
GL_VERTEX_SHADER     :u32: 0x8B31;
GL_FRAGMENT_SHADER   :u32: 0x8B30;
GL_COMPILE_STATUS    :u32: 0x8B81;
GL_LINK_STATUS       :u32: 0x8B82;
GL_ARRAY_BUFFER      :u32: 0x8892;
GL_ELEMENT_ARRAY_BUFFER :u32: 0x8893;
GL_STATIC_DRAW       :u32: 0x88E4;
GL_COLOR_BUFFER_BIT  :u32: 0x4000;
GL_DEPTH_BUFFER_BIT  :u32: 0x0100;
GL_FRONT_AND_BACK    :u32: 0x0408;
GL_LINE              :u32: 0x1B01;
GL_FILL              :u32: 0x1B02;

// Function pointer variables (mutable, loaded at runtime)
glClearColor             : (f32, f32, f32, f32) -> void = ---;
glClear                  : (u32) -> void = ---;
glEnable                 : (u32) -> void = ---;
glDisable                : (u32) -> void = ---;
glViewport               : (s32, s32, s32, s32) -> void = ---;
glDrawArrays             : (u32, s32, s32) -> void = ---;
glPolygonMode            : (u32, u32) -> void = ---;
glLineWidth              : (f32) -> void = ---;
glCreateShader           : (u32) -> u32 = ---;
glShaderSource           : (u32, s32, *[:0]u8, *s32) -> void = ---;
glCompileShader          : (u32) -> void = ---;
glGetShaderiv            : (u32, u32, *s32) -> void = ---;
glGetShaderInfoLog       : (u32, s32, *s32, [*]u8) -> void = ---;
glCreateProgram          : () -> u32 = ---;
glAttachShader           : (u32, u32) -> void = ---;
glLinkProgram            : (u32) -> void = ---;
glGetProgramiv           : (u32, u32, *s32) -> void = ---;
glGetProgramInfoLog      : (u32, s32, *s32, [*]u8) -> void = ---;
glUseProgram             : (u32) -> void = ---;
glDeleteShader           : (u32) -> void = ---;
glGenVertexArrays        : (s32, *u32) -> void = ---;
glGenBuffers             : (s32, *u32) -> void = ---;
glBindVertexArray        : (u32) -> void = ---;
glBindBuffer             : (u32, u32) -> void = ---;
glBufferData             : (u32, s64, *void, u32) -> void = ---;
glVertexAttribPointer    : (u32, s32, u32, u8, s32, *void) -> void = ---;
glEnableVertexAttribArray : (u32) -> void = ---;
glGetUniformLocation     : (u32, [:0]u8) -> s32 = ---;
glUniformMatrix4fv       : (s32, s32, u8, [16]f32) -> void = ---;
glUniform3f              : (s32, f32, f32, f32) -> void = ---;
glDepthFunc              : (u32) -> void = ---;
glUniform1f              : (s32, f32) -> void = ---;
GL_LESS                  :u32: 0x0201;
GL_LEQUAL                :u32: 0x0203;

// Loader: call once after creating GL context
// Pass in a proc loader (e.g. SDL_GL_GetProcAddress)
load_gl :: (get_proc: ([:0]u8) -> *void) {
    glClearColor          = xx get_proc("glClearColor");
    glClear               = xx get_proc("glClear");
    glEnable              = xx get_proc("glEnable");
    glDisable             = xx get_proc("glDisable");
    glViewport            = xx get_proc("glViewport");
    glDrawArrays          = xx get_proc("glDrawArrays");
    glPolygonMode         = xx get_proc("glPolygonMode");
    glLineWidth           = xx get_proc("glLineWidth");
    glCreateShader        = xx get_proc("glCreateShader");
    glShaderSource        = xx get_proc("glShaderSource");
    glCompileShader       = xx get_proc("glCompileShader");
    glGetShaderiv         = xx get_proc("glGetShaderiv");
    glGetShaderInfoLog    = xx get_proc("glGetShaderInfoLog");
    glCreateProgram       = xx get_proc("glCreateProgram");
    glAttachShader        = xx get_proc("glAttachShader");
    glLinkProgram         = xx get_proc("glLinkProgram");
    glGetProgramiv        = xx get_proc("glGetProgramiv");
    glGetProgramInfoLog   = xx get_proc("glGetProgramInfoLog");
    glUseProgram          = xx get_proc("glUseProgram");
    glDeleteShader        = xx get_proc("glDeleteShader");
    glGenVertexArrays     = xx get_proc("glGenVertexArrays");
    glGenBuffers          = xx get_proc("glGenBuffers");
    glBindVertexArray     = xx get_proc("glBindVertexArray");
    glBindBuffer          = xx get_proc("glBindBuffer");
    glBufferData          = xx get_proc("glBufferData");
    glVertexAttribPointer = xx get_proc("glVertexAttribPointer");
    glEnableVertexAttribArray = xx get_proc("glEnableVertexAttribArray");
    glGetUniformLocation  = xx get_proc("glGetUniformLocation");
    glUniformMatrix4fv    = xx get_proc("glUniformMatrix4fv");
    glUniform3f           = xx get_proc("glUniform3f");
    glDepthFunc           = xx get_proc("glDepthFunc");
    glUniform1f           = xx get_proc("glUniform1f");
}