git.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 static void reshape(int width, int height) {}
  17 static void wireframe(bool enable);
  18 static void swapbuffers();
  19 static void begin_drawing();
  20 static void end_drawing();
  21
  22 bool init_opengl()
  23 {
  24         if(!glfwInit()) {
  25                 fprintf(stderr, "Failed to initialize GLFW.\n");
  26                 return false;
  27         }
  28
  29         glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
  30         glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
  31         glfwWindowHint(GLFW_SRGB_CAPABLE, GLFW_TRUE);
  32
  33         if(!(win = glfwCreateWindow(win_w, win_h, "glcow", 0, 0))) {
  34                 fprintf(stderr, "Failed to create window.\n");
  35                 return false;
  36         }
  37         glfwMakeContextCurrent(win);
  38
  39         glewInit();
  40
  41         glEnable(GL_DEPTH_TEST);
  42         glEnable(GL_CULL_FACE);
  43         glEnable(GL_FRAMEBUFFER_SRGB); // linear colorspace
  44
  45         gfx_clear = clear;
  46         gfx_viewport = viewport;
  47         gfx_zbuffer = zbuffer;
  48         gfx_cull_face = cull_face;
  49         gfx_reshape = reshape;
  50         gfx_wireframe = wireframe;
  51         gfx_swapbuffers = swapbuffers;
  52         gfx_begin_drawing = begin_drawing;
  53         gfx_end_drawing = end_drawing;
  54
  55         // glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  56         return true;
  57 }
  58
  59 void cleanup_opengl()
  60 {
  61         if(win) {
  62                 glfwDestroyWindow(win);
  63         }
  64         glfwTerminate();
  65 }
  66
  67 static void clear(float r, float g, float b)
  68 {
  69         glClearColor(r, g, b, 1.0);
  70         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  71 }
  72
  73 static void viewport(int x, int y, int width, int height)
  74 {
  75         glViewport(x, y, width, height);
  76 }
  77
  78 static void zbuffer(bool enable)
  79 {
  80         if(enable)
  81                 glEnable(GL_DEPTH_TEST);
  82         else
  83                 glDisable(GL_DEPTH_TEST);
  84 }
  85
  86 static void cull_face(Gfx_cull_face cf)
  87 {
  88         switch(cf) {
  89         case GFX_CULL_NONE:
  90                 glDisable(GL_CULL_FACE);
  91                 break;
  92         case GFX_CULL_FRONT:
  93                 glEnable(GL_CULL_FACE);
  94                 glCullFace(GL_FRONT);
  95                 break;
  96         case GFX_CULL_BACK:
  97                 glEnable(GL_CULL_FACE);
  98                 glCullFace(GL_BACK);
  99                 break;
 100         }
 101 }
 102
 103 static void wireframe(bool enabled)
 104 {
 105         if(enabled)
 106                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 107         else
 108                 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 109 }
 110
 111 static void swapbuffers()
 112 {
 113         glfwSwapBuffers(win);
 114 }
 115
 116 static void begin_drawing()
 117 {
 118 }
 119
 120 static void end_drawing()
 121 {
 122 }