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

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