eleni.mutantstargoat.com Git - demo/blob - src/opengl/opengl.cc

   1 #include <GL/glew.h>
   2 #include <GLFW/glfw3.h>
   3 #include <stdio.h>
   4
   5 #include "gfxapi.h"
   6 #include "opengl/opengl.h"
   7
   8 extern GLFWwindow *win;
   9 extern int win_h;
  10 extern int win_w;
  11
  12 static void clear(float r, float g, float b);
  13 static void viewport(int x, int y, int width, int height);
  14 static void zbuffer(bool enable);
  15 static void cull_face(Gfx_cull_face cf);
  16
  17 bool init_opengl()
  18 {
  19         if(!glfwInit()) {
  20                 fprintf(stderr, "Failed to initialize GLFW.\n");
  21                 return false;
  22         }
  23
  24         glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
  25         glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
  26         glfwWindowHint(GLFW_SRGB_CAPABLE, GLFW_TRUE);
  27
  28         if(!(win = glfwCreateWindow(win_w, win_h, "glcow", 0, 0))) {
  29                 fprintf(stderr, "Failed to create window.\n");
  30                 return false;
  31         }
  32         glfwMakeContextCurrent(win);
  33
  34         glewInit();
  35
  36         glEnable(GL_DEPTH_TEST);
  37         glEnable(GL_CULL_FACE);
  38         glEnable(GL_FRAMEBUFFER_SRGB); // linear colorspace
  39
  40         gfx_clear = clear;
  41         gfx_viewport = viewport;
  42         gfx_zbuffer = zbuffer;
  43         gfx_cull_face = cull_face;
  44
  45         // glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  46         return true;
  47 }
  48
  49 void cleanup_opengl()
  50 {
  51         if(win) {
  52                 glfwDestroyWindow(win);
  53         }
  54         glfwTerminate();
  55 }
  56
  57 static void clear(float r, float g, float b)
  58 {
  59         glClearColor(r, g, b, 1.0);
  60         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  61 }
  62
  63 static void viewport(int x, int y, int width, int height)
  64 {
  65         glViewport(x, y, width, height);
  66 }
  67
  68 static void zbuffer(bool enable)
  69 {
  70         if(enable)
  71                 glEnable(GL_DEPTH_TEST);
  72         else
  73                 glDisable(GL_DEPTH_TEST);
  74 }
  75
  76 static void cull_face(Gfx_cull_face cf)
  77 {
  78         switch(cf) {
  79         case GFX_CULL_NONE:
  80                 glDisable(GL_CULL_FACE);
  81                 break;
  82         case GFX_CULL_FRONT:
  83                 glEnable(GL_CULL_FACE);
  84                 glCullFace(GL_FRONT);
  85                 break;
  86         case GFX_CULL_BACK:
  87                 glEnable(GL_CULL_FACE);
  88                 glCullFace(GL_BACK);
  89                 break;
  90         }
  91 }