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annotate libs/libimago/src/imago_gl.c @ 10:819c7ebb1bec

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added libimago to avoid the external dependency
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 18 Jul 2014 05:07:40 +0300
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nuclear@10 1 #include "imago2.h"
nuclear@10 2
nuclear@10 3
nuclear@10 4 /* to avoid dependency to OpenGL, I'll define all the relevant GL macros manually */
nuclear@10 5 #define GL_UNSIGNED_BYTE 0x1401
nuclear@10 6 #define GL_FLOAT 0x1406
nuclear@10 7
nuclear@10 8 #define GL_LUMINANCE 0x1909
nuclear@10 9 #define GL_RGB 0x1907
nuclear@10 10 #define GL_RGBA 0x1908
nuclear@10 11
nuclear@10 12 #define GL_RGBA32F 0x8814
nuclear@10 13 #define GL_RGB32F 0x8815
nuclear@10 14 #define GL_LUMINANCE32F 0x8818
nuclear@10 15
nuclear@10 16 #define GL_TEXTURE_2D 0x0de1
nuclear@10 17 #define GL_TEXTURE_WRAP_S 0x2802
nuclear@10 18 #define GL_TEXTURE_WRAP_T 0x2803
nuclear@10 19 #define GL_TEXTURE_MAG_FILTER 0x2800
nuclear@10 20 #define GL_TEXTURE_MIN_FILTER 0x2801
nuclear@10 21 #define GL_LINEAR 0x2601
nuclear@10 22 #define GL_REPEAT 0x2901
nuclear@10 23
nuclear@10 24
nuclear@10 25 typedef unsigned int GLenum;
nuclear@10 26 typedef unsigned int GLuint;
nuclear@10 27 typedef int GLint;
nuclear@10 28 typedef int GLsizei;
nuclear@10 29 typedef void GLvoid;
nuclear@10 30
nuclear@10 31 /* for the same reason I'll load GL functions dynamically */
nuclear@10 32 typedef void (*gl_gen_textures_func)(GLsizei, GLuint*);
nuclear@10 33 typedef void (*gl_bind_texture_func)(GLenum, GLuint);
nuclear@10 34 typedef void (*gl_tex_parameteri_func)(GLenum, GLenum, GLint);
nuclear@10 35 typedef void (*gl_tex_image2d_func)(GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid*);
nuclear@10 36
nuclear@10 37 static gl_gen_textures_func gl_gen_textures;
nuclear@10 38 static gl_bind_texture_func gl_bind_texture;
nuclear@10 39 static gl_tex_parameteri_func gl_tex_parameteri;
nuclear@10 40 static gl_tex_image2d_func gl_tex_image2d;
nuclear@10 41
nuclear@10 42 static int load_glfunc(void);
nuclear@10 43
nuclear@10 44 unsigned int img_fmt_glfmt(enum img_fmt fmt)
nuclear@10 45 {
nuclear@10 46 switch(fmt) {
nuclear@10 47 case IMG_FMT_GREY8:
nuclear@10 48 case IMG_FMT_GREYF:
nuclear@10 49 return GL_LUMINANCE;
nuclear@10 50
nuclear@10 51 case IMG_FMT_RGB24:
nuclear@10 52 case IMG_FMT_RGBF:
nuclear@10 53 return GL_RGB;
nuclear@10 54
nuclear@10 55 case IMG_FMT_RGBA32:
nuclear@10 56 case IMG_FMT_RGBAF:
nuclear@10 57 return GL_RGBA;
nuclear@10 58
nuclear@10 59 default:
nuclear@10 60 break;
nuclear@10 61 }
nuclear@10 62 return 0;
nuclear@10 63 }
nuclear@10 64
nuclear@10 65 unsigned int img_fmt_gltype(enum img_fmt fmt)
nuclear@10 66 {
nuclear@10 67 switch(fmt) {
nuclear@10 68 case IMG_FMT_GREY8:
nuclear@10 69 case IMG_FMT_RGB24:
nuclear@10 70 case IMG_FMT_RGBA32:
nuclear@10 71 return GL_UNSIGNED_BYTE;
nuclear@10 72
nuclear@10 73 case IMG_FMT_GREYF:
nuclear@10 74 case IMG_FMT_RGBF:
nuclear@10 75 case IMG_FMT_RGBAF:
nuclear@10 76 return GL_FLOAT;
nuclear@10 77
nuclear@10 78 default:
nuclear@10 79 break;
nuclear@10 80 }
nuclear@10 81 return 0;
nuclear@10 82 }
nuclear@10 83
nuclear@10 84 unsigned int img_fmt_glintfmt(enum img_fmt fmt)
nuclear@10 85 {
nuclear@10 86 switch(fmt) {
nuclear@10 87 case IMG_FMT_GREY8:
nuclear@10 88 return GL_LUMINANCE;
nuclear@10 89 case IMG_FMT_RGB24:
nuclear@10 90 return GL_RGB;
nuclear@10 91 case IMG_FMT_RGBA32:
nuclear@10 92 return GL_RGBA;
nuclear@10 93 case IMG_FMT_GREYF:
nuclear@10 94 return GL_LUMINANCE32F;
nuclear@10 95 case IMG_FMT_RGBF:
nuclear@10 96 return GL_RGB32F;
nuclear@10 97 case IMG_FMT_RGBAF:
nuclear@10 98 return GL_RGBA32F;
nuclear@10 99 default:
nuclear@10 100 break;
nuclear@10 101 }
nuclear@10 102 return 0;
nuclear@10 103 }
nuclear@10 104
nuclear@10 105 unsigned int img_glfmt(struct img_pixmap *img)
nuclear@10 106 {
nuclear@10 107 return img_fmt_glfmt(img->fmt);
nuclear@10 108 }
nuclear@10 109
nuclear@10 110 unsigned int img_gltype(struct img_pixmap *img)
nuclear@10 111 {
nuclear@10 112 return img_fmt_gltype(img->fmt);
nuclear@10 113 }
nuclear@10 114
nuclear@10 115 unsigned int img_glintfmt(struct img_pixmap *img)
nuclear@10 116 {
nuclear@10 117 return img_fmt_glintfmt(img->fmt);
nuclear@10 118 }
nuclear@10 119
nuclear@10 120 unsigned int img_gltexture(struct img_pixmap *img)
nuclear@10 121 {
nuclear@10 122 unsigned int tex;
nuclear@10 123 unsigned int intfmt, fmt, type;
nuclear@10 124
nuclear@10 125 if(!gl_gen_textures) {
nuclear@10 126 if(load_glfunc() == -1) {
nuclear@10 127 fprintf(stderr, "imago: failed to initialize the OpenGL helpers\n");
nuclear@10 128 return 0;
nuclear@10 129 }
nuclear@10 130 }
nuclear@10 131
nuclear@10 132 intfmt = img_glintfmt(img);
nuclear@10 133 fmt = img_glfmt(img);
nuclear@10 134 type = img_gltype(img);
nuclear@10 135
nuclear@10 136 gl_gen_textures(1, &tex);
nuclear@10 137 gl_bind_texture(GL_TEXTURE_2D, tex);
nuclear@10 138 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@10 139 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@10 140 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
nuclear@10 141 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
nuclear@10 142 gl_tex_image2d(GL_TEXTURE_2D, 0, intfmt, img->width, img->height, 0, fmt, type, img->pixels);
nuclear@10 143 return tex;
nuclear@10 144 }
nuclear@10 145
nuclear@10 146 unsigned int img_gltexture_load(const char *fname)
nuclear@10 147 {
nuclear@10 148 struct img_pixmap img;
nuclear@10 149 unsigned int tex;
nuclear@10 150
nuclear@10 151 img_init(&img);
nuclear@10 152 if(img_load(&img, fname) == -1) {
nuclear@10 153 img_destroy(&img);
nuclear@10 154 return 0;
nuclear@10 155 }
nuclear@10 156
nuclear@10 157 tex = img_gltexture(&img);
nuclear@10 158 img_destroy(&img);
nuclear@10 159 return tex;
nuclear@10 160 }
nuclear@10 161
nuclear@10 162 unsigned int img_gltexture_read_file(FILE *fp)
nuclear@10 163 {
nuclear@10 164 struct img_pixmap img;
nuclear@10 165 unsigned int tex;
nuclear@10 166
nuclear@10 167 img_init(&img);
nuclear@10 168 if(img_read_file(&img, fp) == -1) {
nuclear@10 169 img_destroy(&img);
nuclear@10 170 return 0;
nuclear@10 171 }
nuclear@10 172
nuclear@10 173 tex = img_gltexture(&img);
nuclear@10 174 img_destroy(&img);
nuclear@10 175 return tex;
nuclear@10 176 }
nuclear@10 177
nuclear@10 178 unsigned int img_gltexture_read(struct img_io *io)
nuclear@10 179 {
nuclear@10 180 struct img_pixmap img;
nuclear@10 181 unsigned int tex;
nuclear@10 182
nuclear@10 183 img_init(&img);
nuclear@10 184 if(img_read(&img, io) == -1) {
nuclear@10 185 img_destroy(&img);
nuclear@10 186 return 0;
nuclear@10 187 }
nuclear@10 188
nuclear@10 189 tex = img_gltexture(&img);
nuclear@10 190 img_destroy(&img);
nuclear@10 191 return tex;
nuclear@10 192 }
nuclear@10 193
nuclear@10 194 #if defined(__unix__) || defined(__APPLE__)
nuclear@10 195 #ifndef __USE_GNU
nuclear@10 196 #define __USE_GNU
nuclear@10 197 #endif
nuclear@10 198
nuclear@10 199 #include <dlfcn.h>
nuclear@10 200 #endif
nuclear@10 201 #ifdef WIN32
nuclear@10 202 #include <windows.h>
nuclear@10 203 #endif
nuclear@10 204
nuclear@10 205 static int load_glfunc(void)
nuclear@10 206 {
nuclear@10 207 #if defined(__unix__) || defined(__APPLE__)
nuclear@10 208 gl_gen_textures = (gl_gen_textures_func)dlsym(RTLD_DEFAULT, "glGenTextures");
nuclear@10 209 gl_bind_texture = (gl_bind_texture_func)dlsym(RTLD_DEFAULT, "glBindTexture");
nuclear@10 210 gl_tex_parameteri = (gl_tex_parameteri_func)dlsym(RTLD_DEFAULT, "glTexParameteri");
nuclear@10 211 gl_tex_image2d = (gl_tex_image2d_func)dlsym(RTLD_DEFAULT, "glTexImage2D");
nuclear@10 212 #endif
nuclear@10 213
nuclear@10 214 #ifdef WIN32
nuclear@10 215 HMODULE handle = GetModuleHandle(0);
nuclear@10 216 gl_gen_textures = (gl_gen_textures_func)GetProcAddress(handle, "glGenTextures");
nuclear@10 217 gl_bind_texture = (gl_bind_texture_func)GetProcAddress(handle, "glBindTexture");
nuclear@10 218 gl_tex_parameteri = (gl_tex_parameteri_func)GetProcAddress(handle, "glTexParameteri");
nuclear@10 219 gl_tex_image2d = (gl_tex_image2d_func)GetProcAddress(handle, "glTexImage2D");
nuclear@10 220 #endif
nuclear@10 221
nuclear@10 222 return (gl_gen_textures && gl_bind_texture && gl_tex_parameteri && gl_tex_image2d) ? 0 : -1;
nuclear@10 223 }