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view libs/imago/imago_gl.c @ 15:2d48f65da357
assman
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sun, 07 Jun 2015 20:40:37 +0300 |
| parents | |
| children |
line source
1 #include "imago2.h"
3 /* to avoid dependency to OpenGL, I'll define all the relevant GL macros manually */
4 #define GL_UNSIGNED_BYTE 0x1401
5 #define GL_FLOAT 0x1406
7 #define GL_LUMINANCE 0x1909
8 #define GL_RGB 0x1907
9 #define GL_RGBA 0x1908
11 #define GL_RGBA32F 0x8814
12 #define GL_RGB32F 0x8815
13 #define GL_LUMINANCE32F 0x8818
15 #define GL_TEXTURE_2D 0x0de1
16 #define GL_TEXTURE_WRAP_S 0x2802
17 #define GL_TEXTURE_WRAP_T 0x2803
18 #define GL_TEXTURE_MAG_FILTER 0x2800
19 #define GL_TEXTURE_MIN_FILTER 0x2801
20 #define GL_LINEAR 0x2601
21 #define GL_REPEAT 0x2901
24 typedef unsigned int GLenum;
25 typedef unsigned int GLuint;
26 typedef int GLint;
27 typedef int GLsizei;
28 typedef void GLvoid;
30 /* for the same reason I'll load GL functions dynamically */
31 #ifndef WIN32
32 typedef void (*gl_gen_textures_func)(GLsizei, GLuint*);
33 typedef void (*gl_bind_texture_func)(GLenum, GLuint);
34 typedef void (*gl_tex_parameteri_func)(GLenum, GLenum, GLint);
35 typedef void (*gl_tex_image2d_func)(GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid*);
36 #else
37 typedef void (__stdcall *gl_gen_textures_func)(GLsizei, GLuint*);
38 typedef void (__stdcall *gl_bind_texture_func)(GLenum, GLuint);
39 typedef void (__stdcall *gl_tex_parameteri_func)(GLenum, GLenum, GLint);
40 typedef void (__stdcall *gl_tex_image2d_func)(GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid*);
41 #endif
43 static gl_gen_textures_func gl_gen_textures;
44 static gl_bind_texture_func gl_bind_texture;
45 static gl_tex_parameteri_func gl_tex_parameteri;
46 static gl_tex_image2d_func gl_tex_image2d;
48 static int load_glfunc(void);
50 unsigned int img_fmt_glfmt(enum img_fmt fmt)
51 {
52 switch(fmt) {
53 case IMG_FMT_GREY8:
54 case IMG_FMT_GREYF:
55 return GL_LUMINANCE;
57 case IMG_FMT_RGB24:
58 case IMG_FMT_RGBF:
59 return GL_RGB;
61 case IMG_FMT_RGBA32:
62 case IMG_FMT_RGBAF:
63 return GL_RGBA;
65 default:
66 break;
67 }
68 return 0;
69 }
71 unsigned int img_fmt_gltype(enum img_fmt fmt)
72 {
73 switch(fmt) {
74 case IMG_FMT_GREY8:
75 case IMG_FMT_RGB24:
76 case IMG_FMT_RGBA32:
77 return GL_UNSIGNED_BYTE;
79 case IMG_FMT_GREYF:
80 case IMG_FMT_RGBF:
81 case IMG_FMT_RGBAF:
82 return GL_FLOAT;
84 default:
85 break;
86 }
87 return 0;
88 }
90 unsigned int img_fmt_glintfmt(enum img_fmt fmt)
91 {
92 switch(fmt) {
93 case IMG_FMT_GREY8:
94 return GL_LUMINANCE;
95 case IMG_FMT_RGB24:
96 return GL_RGB;
97 case IMG_FMT_RGBA32:
98 return GL_RGBA;
99 case IMG_FMT_GREYF:
100 return GL_LUMINANCE32F;
101 case IMG_FMT_RGBF:
102 return GL_RGB32F;
103 case IMG_FMT_RGBAF:
104 return GL_RGBA32F;
105 default:
106 break;
107 }
108 return 0;
109 }
111 unsigned int img_glfmt(struct img_pixmap *img)
112 {
113 return img_fmt_glfmt(img->fmt);
114 }
116 unsigned int img_gltype(struct img_pixmap *img)
117 {
118 return img_fmt_gltype(img->fmt);
119 }
121 unsigned int img_glintfmt(struct img_pixmap *img)
122 {
123 return img_fmt_glintfmt(img->fmt);
124 }
126 unsigned int img_gltexture(struct img_pixmap *img)
127 {
128 unsigned int tex;
129 unsigned int intfmt, fmt, type;
131 if(!gl_gen_textures) {
132 if(load_glfunc() == -1) {
133 fprintf(stderr, "imago: failed to initialize the OpenGL helpers\n");
134 return 0;
135 }
136 }
138 intfmt = img_glintfmt(img);
139 fmt = img_glfmt(img);
140 type = img_gltype(img);
142 gl_gen_textures(1, &tex);
143 gl_bind_texture(GL_TEXTURE_2D, tex);
144 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
145 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
146 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
147 gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
148 gl_tex_image2d(GL_TEXTURE_2D, 0, intfmt, img->width, img->height, 0, fmt, type, img->pixels);
149 return tex;
150 }
152 unsigned int img_gltexture_load(const char *fname)
153 {
154 struct img_pixmap img;
155 unsigned int tex;
157 img_init(&img);
158 if(img_load(&img, fname) == -1) {
159 img_destroy(&img);
160 return 0;
161 }
163 tex = img_gltexture(&img);
164 img_destroy(&img);
165 return tex;
166 }
168 unsigned int img_gltexture_read_file(FILE *fp)
169 {
170 struct img_pixmap img;
171 unsigned int tex;
173 img_init(&img);
174 if(img_read_file(&img, fp) == -1) {
175 img_destroy(&img);
176 return 0;
177 }
179 tex = img_gltexture(&img);
180 img_destroy(&img);
181 return tex;
182 }
184 unsigned int img_gltexture_read(struct img_io *io)
185 {
186 struct img_pixmap img;
187 unsigned int tex;
189 img_init(&img);
190 if(img_read(&img, io) == -1) {
191 img_destroy(&img);
192 return 0;
193 }
195 tex = img_gltexture(&img);
196 img_destroy(&img);
197 return tex;
198 }
200 #if defined(__unix__) || defined(__APPLE__)
201 #ifndef __USE_GNU
202 #define __USE_GNU
203 #endif
205 #include <dlfcn.h>
206 #endif
207 #ifdef WIN32
208 #include <windows.h>
209 #endif
211 static int load_glfunc(void)
212 {
213 #if defined(__unix__) || defined(__APPLE__)
214 gl_gen_textures = (gl_gen_textures_func)dlsym(RTLD_DEFAULT, "glGenTextures");
215 gl_bind_texture = (gl_bind_texture_func)dlsym(RTLD_DEFAULT, "glBindTexture");
216 gl_tex_parameteri = (gl_tex_parameteri_func)dlsym(RTLD_DEFAULT, "glTexParameteri");
217 gl_tex_image2d = (gl_tex_image2d_func)dlsym(RTLD_DEFAULT, "glTexImage2D");
218 #endif
220 #ifdef WIN32
221 HANDLE dll = LoadLibrary("opengl32.dll");
222 if(dll) {
223 gl_gen_textures = (gl_gen_textures_func)GetProcAddress(dll, "glGenTextures");
224 gl_bind_texture = (gl_bind_texture_func)GetProcAddress(dll, "glBindTexture");
225 gl_tex_parameteri = (gl_tex_parameteri_func)GetProcAddress(dll, "glTexParameteri");
226 gl_tex_image2d = (gl_tex_image2d_func)GetProcAddress(dll, "glTexImage2D");
227 }
228 #endif
230 return (gl_gen_textures && gl_bind_texture && gl_tex_parameteri && gl_tex_image2d) ? 0 : -1;
231 }