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annotate libs/imago/imago_gl.c @ 14:06dc8b9b4f89

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added libimago, libjpeg and libpng
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 07 Jun 2015 17:25:49 +0300
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rev   line source
nuclear@14 1 #include "imago2.h"
nuclear@14 2
nuclear@14 3 /* to avoid dependency to OpenGL, I'll define all the relevant GL macros manually */
nuclear@14 4 #define GL_UNSIGNED_BYTE 0x1401
nuclear@14 5 #define GL_FLOAT 0x1406
nuclear@14 6
nuclear@14 7 #define GL_LUMINANCE 0x1909
nuclear@14 8 #define GL_RGB 0x1907
nuclear@14 9 #define GL_RGBA 0x1908
nuclear@14 10
nuclear@14 11 #define GL_RGBA32F 0x8814
nuclear@14 12 #define GL_RGB32F 0x8815
nuclear@14 13 #define GL_LUMINANCE32F 0x8818
nuclear@14 14
nuclear@14 15 #define GL_TEXTURE_2D 0x0de1
nuclear@14 16 #define GL_TEXTURE_WRAP_S 0x2802
nuclear@14 17 #define GL_TEXTURE_WRAP_T 0x2803
nuclear@14 18 #define GL_TEXTURE_MAG_FILTER 0x2800
nuclear@14 19 #define GL_TEXTURE_MIN_FILTER 0x2801
nuclear@14 20 #define GL_LINEAR 0x2601
nuclear@14 21 #define GL_REPEAT 0x2901
nuclear@14 22
nuclear@14 23
nuclear@14 24 typedef unsigned int GLenum;
nuclear@14 25 typedef unsigned int GLuint;
nuclear@14 26 typedef int GLint;
nuclear@14 27 typedef int GLsizei;
nuclear@14 28 typedef void GLvoid;
nuclear@14 29
nuclear@14 30 /* for the same reason I'll load GL functions dynamically */
nuclear@14 31 #ifndef WIN32
nuclear@14 32 typedef void (*gl_gen_textures_func)(GLsizei, GLuint*);
nuclear@14 33 typedef void (*gl_bind_texture_func)(GLenum, GLuint);
nuclear@14 34 typedef void (*gl_tex_parameteri_func)(GLenum, GLenum, GLint);
nuclear@14 35 typedef void (*gl_tex_image2d_func)(GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid*);
nuclear@14 36 #else
nuclear@14 37 typedef void (__stdcall *gl_gen_textures_func)(GLsizei, GLuint*);
nuclear@14 38 typedef void (__stdcall *gl_bind_texture_func)(GLenum, GLuint);
nuclear@14 39 typedef void (__stdcall *gl_tex_parameteri_func)(GLenum, GLenum, GLint);
nuclear@14 40 typedef void (__stdcall *gl_tex_image2d_func)(GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid*);
nuclear@14 41 #endif
nuclear@14 42
nuclear@14 43 static gl_gen_textures_func gl_gen_textures;
nuclear@14 44 static gl_bind_texture_func gl_bind_texture;
nuclear@14 45 static gl_tex_parameteri_func gl_tex_parameteri;
nuclear@14 46 static gl_tex_image2d_func gl_tex_image2d;
nuclear@14 47
nuclear@14 48 static int load_glfunc(void);
nuclear@14 49
nuclear@14 50 unsigned int img_fmt_glfmt(enum img_fmt fmt)
nuclear@14 51 {
nuclear@14 52 switch(fmt) {
nuclear@14 53 case IMG_FMT_GREY8:
nuclear@14 54 case IMG_FMT_GREYF:
nuclear@14 55 return GL_LUMINANCE;
nuclear@14 56
nuclear@14 57 case IMG_FMT_RGB24:
nuclear@14 58 case IMG_FMT_RGBF:
nuclear@14 59 return GL_RGB;
nuclear@14 60
nuclear@14 61 case IMG_FMT_RGBA32:
nuclear@14 62 case IMG_FMT_RGBAF:
nuclear@14 63 return GL_RGBA;
nuclear@14 64
nuclear@14 65 default:
nuclear@14 66 break;
nuclear@14 67 }
nuclear@14 68 return 0;
nuclear@14 69 }
nuclear@14 70
nuclear@14 71 unsigned int img_fmt_gltype(enum img_fmt fmt)
nuclear@14 72 {
nuclear@14 73 switch(fmt) {
nuclear@14 74 case IMG_FMT_GREY8:
nuclear@14 75 case IMG_FMT_RGB24:
nuclear@14 76 case IMG_FMT_RGBA32:
nuclear@14 77 return GL_UNSIGNED_BYTE;
nuclear@14 78
nuclear@14 79 case IMG_FMT_GREYF:
nuclear@14 80 case IMG_FMT_RGBF:
nuclear@14 81 case IMG_FMT_RGBAF:
nuclear@14 82 return GL_FLOAT;
nuclear@14 83
nuclear@14 84 default:
nuclear@14 85 break;
nuclear@14 86 }
nuclear@14 87 return 0;
nuclear@14 88 }
nuclear@14 89
nuclear@14 90 unsigned int img_fmt_glintfmt(enum img_fmt fmt)
nuclear@14 91 {
nuclear@14 92 switch(fmt) {
nuclear@14 93 case IMG_FMT_GREY8:
nuclear@14 94 return GL_LUMINANCE;
nuclear@14 95 case IMG_FMT_RGB24:
nuclear@14 96 return GL_RGB;
nuclear@14 97 case IMG_FMT_RGBA32:
nuclear@14 98 return GL_RGBA;
nuclear@14 99 case IMG_FMT_GREYF:
nuclear@14 100 return GL_LUMINANCE32F;
nuclear@14 101 case IMG_FMT_RGBF:
nuclear@14 102 return GL_RGB32F;
nuclear@14 103 case IMG_FMT_RGBAF:
nuclear@14 104 return GL_RGBA32F;
nuclear@14 105 default:
nuclear@14 106 break;
nuclear@14 107 }
nuclear@14 108 return 0;
nuclear@14 109 }
nuclear@14 110
nuclear@14 111 unsigned int img_glfmt(struct img_pixmap *img)
nuclear@14 112 {
nuclear@14 113 return img_fmt_glfmt(img->fmt);
nuclear@14 114 }
nuclear@14 115
nuclear@14 116 unsigned int img_gltype(struct img_pixmap *img)
nuclear@14 117 {
nuclear@14 118 return img_fmt_gltype(img->fmt);
nuclear@14 119 }
nuclear@14 120
nuclear@14 121 unsigned int img_glintfmt(struct img_pixmap *img)
nuclear@14 122 {
nuclear@14 123 return img_fmt_glintfmt(img->fmt);
nuclear@14 124 }
nuclear@14 125
nuclear@14 126 unsigned int img_gltexture(struct img_pixmap *img)
nuclear@14 127 {
nuclear@14 128 unsigned int tex;
nuclear@14 129 unsigned int intfmt, fmt, type;
nuclear@14 130
nuclear@14 131 if(!gl_gen_textures) {
nuclear@14 132 if(load_glfunc() == -1) {
nuclear@14 133 fprintf(stderr, "imago: failed to initialize the OpenGL helpers\n");
nuclear@14 134 return 0;
nuclear@14 135 }
nuclear@14 136 }
nuclear@14 137
nuclear@14 138 intfmt = img_glintfmt(img);
nuclear@14 139 fmt = img_glfmt(img);
nuclear@14 140 type = img_gltype(img);
nuclear@14 141
nuclear@14 142 gl_gen_textures(1, &tex);
nuclear@14 143 gl_bind_texture(GL_TEXTURE_2D, tex);
nuclear@14 144 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@14 145 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@14 146 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
nuclear@14 147 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
nuclear@14 148 gl_tex_image2d(GL_TEXTURE_2D, 0, intfmt, img->width, img->height, 0, fmt, type, img->pixels);
nuclear@14 149 return tex;
nuclear@14 150 }
nuclear@14 151
nuclear@14 152 unsigned int img_gltexture_load(const char *fname)
nuclear@14 153 {
nuclear@14 154 struct img_pixmap img;
nuclear@14 155 unsigned int tex;
nuclear@14 156
nuclear@14 157 img_init(&img);
nuclear@14 158 if(img_load(&img, fname) == -1) {
nuclear@14 159 img_destroy(&img);
nuclear@14 160 return 0;
nuclear@14 161 }
nuclear@14 162
nuclear@14 163 tex = img_gltexture(&img);
nuclear@14 164 img_destroy(&img);
nuclear@14 165 return tex;
nuclear@14 166 }
nuclear@14 167
nuclear@14 168 unsigned int img_gltexture_read_file(FILE *fp)
nuclear@14 169 {
nuclear@14 170 struct img_pixmap img;
nuclear@14 171 unsigned int tex;
nuclear@14 172
nuclear@14 173 img_init(&img);
nuclear@14 174 if(img_read_file(&img, fp) == -1) {
nuclear@14 175 img_destroy(&img);
nuclear@14 176 return 0;
nuclear@14 177 }
nuclear@14 178
nuclear@14 179 tex = img_gltexture(&img);
nuclear@14 180 img_destroy(&img);
nuclear@14 181 return tex;
nuclear@14 182 }
nuclear@14 183
nuclear@14 184 unsigned int img_gltexture_read(struct img_io *io)
nuclear@14 185 {
nuclear@14 186 struct img_pixmap img;
nuclear@14 187 unsigned int tex;
nuclear@14 188
nuclear@14 189 img_init(&img);
nuclear@14 190 if(img_read(&img, io) == -1) {
nuclear@14 191 img_destroy(&img);
nuclear@14 192 return 0;
nuclear@14 193 }
nuclear@14 194
nuclear@14 195 tex = img_gltexture(&img);
nuclear@14 196 img_destroy(&img);
nuclear@14 197 return tex;
nuclear@14 198 }
nuclear@14 199
nuclear@14 200 #if defined(__unix__) || defined(__APPLE__)
nuclear@14 201 #ifndef __USE_GNU
nuclear@14 202 #define __USE_GNU
nuclear@14 203 #endif
nuclear@14 204
nuclear@14 205 #include <dlfcn.h>
nuclear@14 206 #endif
nuclear@14 207 #ifdef WIN32
nuclear@14 208 #include <windows.h>
nuclear@14 209 #endif
nuclear@14 210
nuclear@14 211 static int load_glfunc(void)
nuclear@14 212 {
nuclear@14 213 #if defined(__unix__) || defined(__APPLE__)
nuclear@14 214 gl_gen_textures = (gl_gen_textures_func)dlsym(RTLD_DEFAULT, "glGenTextures");
nuclear@14 215 gl_bind_texture = (gl_bind_texture_func)dlsym(RTLD_DEFAULT, "glBindTexture");
nuclear@14 216 gl_tex_parameteri = (gl_tex_parameteri_func)dlsym(RTLD_DEFAULT, "glTexParameteri");
nuclear@14 217 gl_tex_image2d = (gl_tex_image2d_func)dlsym(RTLD_DEFAULT, "glTexImage2D");
nuclear@14 218 #endif
nuclear@14 219
nuclear@14 220 #ifdef WIN32
nuclear@14 221 HANDLE dll = LoadLibrary("opengl32.dll");
nuclear@14 222 if(dll) {
nuclear@14 223 gl_gen_textures = (gl_gen_textures_func)GetProcAddress(dll, "glGenTextures");
nuclear@14 224 gl_bind_texture = (gl_bind_texture_func)GetProcAddress(dll, "glBindTexture");
nuclear@14 225 gl_tex_parameteri = (gl_tex_parameteri_func)GetProcAddress(dll, "glTexParameteri");
nuclear@14 226 gl_tex_image2d = (gl_tex_image2d_func)GetProcAddress(dll, "glTexImage2D");
nuclear@14 227 }
nuclear@14 228 #endif
nuclear@14 229
nuclear@14 230 return (gl_gen_textures && gl_bind_texture && gl_tex_parameteri && gl_tex_image2d) ? 0 : -1;
nuclear@14 231 }