dbf-halloween2015

annotate libs/imago/imago_gl.c @ 2:5ae5fd3626fa

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macosx port works
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 01 Nov 2015 00:51:36 +0200
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rev   line source
nuclear@1 1 #include "imago2.h"
nuclear@1 2
nuclear@1 3
nuclear@1 4 /* to avoid dependency to OpenGL, I'll define all the relevant GL macros manually */
nuclear@1 5 #define GL_UNSIGNED_BYTE 0x1401
nuclear@1 6 #define GL_FLOAT 0x1406
nuclear@1 7
nuclear@1 8 #define GL_LUMINANCE 0x1909
nuclear@1 9 #define GL_RGB 0x1907
nuclear@1 10 #define GL_RGBA 0x1908
nuclear@1 11
nuclear@1 12 #define GL_RGBA32F 0x8814
nuclear@1 13 #define GL_RGB32F 0x8815
nuclear@1 14 #define GL_LUMINANCE32F 0x8818
nuclear@1 15
nuclear@1 16 #define GL_TEXTURE_2D 0x0de1
nuclear@1 17 #define GL_TEXTURE_WRAP_S 0x2802
nuclear@1 18 #define GL_TEXTURE_WRAP_T 0x2803
nuclear@1 19 #define GL_TEXTURE_MAG_FILTER 0x2800
nuclear@1 20 #define GL_TEXTURE_MIN_FILTER 0x2801
nuclear@1 21 #define GL_LINEAR 0x2601
nuclear@1 22 #define GL_REPEAT 0x2901
nuclear@1 23
nuclear@1 24
nuclear@1 25 typedef unsigned int GLenum;
nuclear@1 26 typedef unsigned int GLuint;
nuclear@1 27 typedef int GLint;
nuclear@1 28 typedef int GLsizei;
nuclear@1 29 typedef void GLvoid;
nuclear@1 30
nuclear@1 31 /* for the same reason I'll load GL functions dynamically */
nuclear@1 32 typedef void (*gl_gen_textures_func)(GLsizei, GLuint*);
nuclear@1 33 typedef void (*gl_bind_texture_func)(GLenum, GLuint);
nuclear@1 34 typedef void (*gl_tex_parameteri_func)(GLenum, GLenum, GLint);
nuclear@1 35 typedef void (*gl_tex_image2d_func)(GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid*);
nuclear@1 36
nuclear@1 37 static gl_gen_textures_func gl_gen_textures;
nuclear@1 38 static gl_bind_texture_func gl_bind_texture;
nuclear@1 39 static gl_tex_parameteri_func gl_tex_parameteri;
nuclear@1 40 static gl_tex_image2d_func gl_tex_image2d;
nuclear@1 41
nuclear@1 42 static int load_glfunc(void);
nuclear@1 43
nuclear@1 44 unsigned int img_fmt_glfmt(enum img_fmt fmt)
nuclear@1 45 {
nuclear@1 46 switch(fmt) {
nuclear@1 47 case IMG_FMT_GREY8:
nuclear@1 48 case IMG_FMT_GREYF:
nuclear@1 49 return GL_LUMINANCE;
nuclear@1 50
nuclear@1 51 case IMG_FMT_RGB24:
nuclear@1 52 case IMG_FMT_RGBF:
nuclear@1 53 return GL_RGB;
nuclear@1 54
nuclear@1 55 case IMG_FMT_RGBA32:
nuclear@1 56 case IMG_FMT_RGBAF:
nuclear@1 57 return GL_RGBA;
nuclear@1 58
nuclear@1 59 default:
nuclear@1 60 break;
nuclear@1 61 }
nuclear@1 62 return 0;
nuclear@1 63 }
nuclear@1 64
nuclear@1 65 unsigned int img_fmt_gltype(enum img_fmt fmt)
nuclear@1 66 {
nuclear@1 67 switch(fmt) {
nuclear@1 68 case IMG_FMT_GREY8:
nuclear@1 69 case IMG_FMT_RGB24:
nuclear@1 70 case IMG_FMT_RGBA32:
nuclear@1 71 return GL_UNSIGNED_BYTE;
nuclear@1 72
nuclear@1 73 case IMG_FMT_GREYF:
nuclear@1 74 case IMG_FMT_RGBF:
nuclear@1 75 case IMG_FMT_RGBAF:
nuclear@1 76 return GL_FLOAT;
nuclear@1 77
nuclear@1 78 default:
nuclear@1 79 break;
nuclear@1 80 }
nuclear@1 81 return 0;
nuclear@1 82 }
nuclear@1 83
nuclear@1 84 unsigned int img_fmt_glintfmt(enum img_fmt fmt)
nuclear@1 85 {
nuclear@1 86 switch(fmt) {
nuclear@1 87 case IMG_FMT_GREY8:
nuclear@1 88 return GL_LUMINANCE;
nuclear@1 89 case IMG_FMT_RGB24:
nuclear@1 90 return GL_RGB;
nuclear@1 91 case IMG_FMT_RGBA32:
nuclear@1 92 return GL_RGBA;
nuclear@1 93 case IMG_FMT_GREYF:
nuclear@1 94 return GL_LUMINANCE32F;
nuclear@1 95 case IMG_FMT_RGBF:
nuclear@1 96 return GL_RGB32F;
nuclear@1 97 case IMG_FMT_RGBAF:
nuclear@1 98 return GL_RGBA32F;
nuclear@1 99 default:
nuclear@1 100 break;
nuclear@1 101 }
nuclear@1 102 return 0;
nuclear@1 103 }
nuclear@1 104
nuclear@1 105 unsigned int img_glfmt(struct img_pixmap *img)
nuclear@1 106 {
nuclear@1 107 return img_fmt_glfmt(img->fmt);
nuclear@1 108 }
nuclear@1 109
nuclear@1 110 unsigned int img_gltype(struct img_pixmap *img)
nuclear@1 111 {
nuclear@1 112 return img_fmt_gltype(img->fmt);
nuclear@1 113 }
nuclear@1 114
nuclear@1 115 unsigned int img_glintfmt(struct img_pixmap *img)
nuclear@1 116 {
nuclear@1 117 return img_fmt_glintfmt(img->fmt);
nuclear@1 118 }
nuclear@1 119
nuclear@1 120 unsigned int img_gltexture(struct img_pixmap *img)
nuclear@1 121 {
nuclear@1 122 unsigned int tex;
nuclear@1 123 unsigned int intfmt, fmt, type;
nuclear@1 124
nuclear@1 125 if(!gl_gen_textures) {
nuclear@1 126 if(load_glfunc() == -1) {
nuclear@1 127 fprintf(stderr, "imago: failed to initialize the OpenGL helpers\n");
nuclear@1 128 return 0;
nuclear@1 129 }
nuclear@1 130 }
nuclear@1 131
nuclear@1 132 intfmt = img_glintfmt(img);
nuclear@1 133 fmt = img_glfmt(img);
nuclear@1 134 type = img_gltype(img);
nuclear@1 135
nuclear@1 136 gl_gen_textures(1, &tex);
nuclear@1 137 gl_bind_texture(GL_TEXTURE_2D, tex);
nuclear@1 138 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@1 139 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@1 140 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
nuclear@1 141 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
nuclear@1 142 gl_tex_image2d(GL_TEXTURE_2D, 0, intfmt, img->width, img->height, 0, fmt, type, img->pixels);
nuclear@1 143 return tex;
nuclear@1 144 }
nuclear@1 145
nuclear@1 146 unsigned int img_gltexture_load(const char *fname)
nuclear@1 147 {
nuclear@1 148 struct img_pixmap img;
nuclear@1 149 unsigned int tex;
nuclear@1 150
nuclear@1 151 img_init(&img);
nuclear@1 152 if(img_load(&img, fname) == -1) {
nuclear@1 153 img_destroy(&img);
nuclear@1 154 return 0;
nuclear@1 155 }
nuclear@1 156
nuclear@1 157 tex = img_gltexture(&img);
nuclear@1 158 img_destroy(&img);
nuclear@1 159 return tex;
nuclear@1 160 }
nuclear@1 161
nuclear@1 162 unsigned int img_gltexture_read_file(FILE *fp)
nuclear@1 163 {
nuclear@1 164 struct img_pixmap img;
nuclear@1 165 unsigned int tex;
nuclear@1 166
nuclear@1 167 img_init(&img);
nuclear@1 168 if(img_read_file(&img, fp) == -1) {
nuclear@1 169 img_destroy(&img);
nuclear@1 170 return 0;
nuclear@1 171 }
nuclear@1 172
nuclear@1 173 tex = img_gltexture(&img);
nuclear@1 174 img_destroy(&img);
nuclear@1 175 return tex;
nuclear@1 176 }
nuclear@1 177
nuclear@1 178 unsigned int img_gltexture_read(struct img_io *io)
nuclear@1 179 {
nuclear@1 180 struct img_pixmap img;
nuclear@1 181 unsigned int tex;
nuclear@1 182
nuclear@1 183 img_init(&img);
nuclear@1 184 if(img_read(&img, io) == -1) {
nuclear@1 185 img_destroy(&img);
nuclear@1 186 return 0;
nuclear@1 187 }
nuclear@1 188
nuclear@1 189 tex = img_gltexture(&img);
nuclear@1 190 img_destroy(&img);
nuclear@1 191 return tex;
nuclear@1 192 }
nuclear@1 193
nuclear@1 194 #if defined(__unix__) || defined(__APPLE__)
nuclear@1 195 #ifndef __USE_GNU
nuclear@1 196 #define __USE_GNU
nuclear@1 197 #endif
nuclear@1 198
nuclear@1 199 #include <dlfcn.h>
nuclear@1 200 #endif
nuclear@1 201 #ifdef WIN32
nuclear@1 202 #include <windows.h>
nuclear@1 203 #endif
nuclear@1 204
nuclear@1 205 static int load_glfunc(void)
nuclear@1 206 {
nuclear@1 207 #if defined(__unix__) || defined(__APPLE__)
nuclear@1 208 gl_gen_textures = (gl_gen_textures_func)dlsym(RTLD_DEFAULT, "glGenTextures");
nuclear@1 209 gl_bind_texture = (gl_bind_texture_func)dlsym(RTLD_DEFAULT, "glBindTexture");
nuclear@1 210 gl_tex_parameteri = (gl_tex_parameteri_func)dlsym(RTLD_DEFAULT, "glTexParameteri");
nuclear@1 211 gl_tex_image2d = (gl_tex_image2d_func)dlsym(RTLD_DEFAULT, "glTexImage2D");
nuclear@1 212 #endif
nuclear@1 213
nuclear@1 214 #ifdef WIN32
nuclear@1 215 HMODULE handle = GetModuleHandle(0);
nuclear@1 216 gl_gen_textures = (gl_gen_textures_func)GetProcAddress(handle, "glGenTextures");
nuclear@1 217 gl_bind_texture = (gl_bind_texture_func)GetProcAddress(handle, "glBindTexture");
nuclear@1 218 gl_tex_parameteri = (gl_tex_parameteri_func)GetProcAddress(handle, "glTexParameteri");
nuclear@1 219 gl_tex_image2d = (gl_tex_image2d_func)GetProcAddress(handle, "glTexImage2D");
nuclear@1 220 #endif
nuclear@1 221
nuclear@1 222 return (gl_gen_textures && gl_bind_texture && gl_tex_parameteri && gl_tex_image2d) ? 0 : -1;
nuclear@1 223 }