| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <string.h> |
| 4 | #include <assert.h> |
| 5 | |
| 6 | #include <EGL/egl.h> |
| 7 | #include <GLES/gl.h> |
| 8 | #include "gl_loader.h" |
| 9 | #include "gl_platform.h" |
| 10 | #include "gl.h" |
| 11 | |
| 12 | static EGLDisplay edpy = EGL_NO_DISPLAY; |
| 13 | static EGLSurface esfc = EGL_NO_SURFACE; |
| 14 | static EGLContext ectxt = EGL_NO_CONTEXT; |
| 15 | |
| 16 | static GLuint texture_name; |
| 17 | |
| 18 | /* for external flips */ |
| 19 | void *gl_es_display; |
| 20 | void *gl_es_surface; |
| 21 | |
| 22 | static int tex_w, tex_h; |
| 23 | static void *tex_mem; |
| 24 | static int flip_old_w, flip_old_h; |
| 25 | |
| 26 | static int gl_have_error(const char *name) |
| 27 | { |
| 28 | GLenum e = glGetError(); |
| 29 | if (e != GL_NO_ERROR) { |
| 30 | fprintf(stderr, "GL error: %s %x\n", name, e); |
| 31 | return 1; |
| 32 | } |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | static int gles_have_error(const char *name) |
| 37 | { |
| 38 | EGLint e = eglGetError(); |
| 39 | if (e != EGL_SUCCESS) { |
| 40 | fprintf(stderr, "%s %x\n", name, e); |
| 41 | return 1; |
| 42 | } |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | int gl_init(void *display, int *quirks) |
| 47 | { |
| 48 | int retval = -1; |
| 49 | int ret; |
| 50 | |
| 51 | ret = gl_platform_init(&display, quirks); |
| 52 | if (ret != 0) { |
| 53 | fprintf(stderr, "gl_platform_init failed with %d\n", ret); |
| 54 | return retval; |
| 55 | } |
| 56 | |
| 57 | edpy = eglGetDisplay((EGLNativeDisplayType)display); |
| 58 | if (edpy == EGL_NO_DISPLAY) { |
| 59 | fprintf(stderr, "Failed to get EGL display\n"); |
| 60 | goto out; |
| 61 | } |
| 62 | |
| 63 | if (!eglInitialize(edpy, NULL, NULL)) { |
| 64 | fprintf(stderr, "Failed to initialize EGL\n"); |
| 65 | goto out; |
| 66 | } |
| 67 | retval = 0; |
| 68 | |
| 69 | out: |
| 70 | if (retval && edpy != EGL_NO_DISPLAY) |
| 71 | gl_shutdown(); |
| 72 | return retval; |
| 73 | } |
| 74 | |
| 75 | int gl_create(void *window, int *quirks, int w, int h) |
| 76 | { |
| 77 | EGLConfig ecfg = NULL; |
| 78 | EGLint num_config; |
| 79 | int retval = -1; |
| 80 | int ret; |
| 81 | EGLint config_attr[] = |
| 82 | { |
| 83 | EGL_NONE |
| 84 | }; |
| 85 | |
| 86 | ret = gl_platform_create(&window, quirks); |
| 87 | if (ret != 0) { |
| 88 | fprintf(stderr, "gl_platform_init failed with %d\n", ret); |
| 89 | return retval; |
| 90 | } |
| 91 | |
| 92 | flip_old_w = flip_old_h = 0; |
| 93 | for (tex_w = 1; tex_w < w; tex_w *= 2) |
| 94 | ; |
| 95 | for (tex_h = 1; tex_h < h; tex_h *= 2) |
| 96 | ; |
| 97 | tex_mem = realloc(tex_mem, tex_w * tex_h * 2); |
| 98 | if (tex_mem == NULL) { |
| 99 | fprintf(stderr, "OOM\n"); |
| 100 | goto out; |
| 101 | } |
| 102 | memset(tex_mem, 0, tex_w * tex_h * 2); |
| 103 | |
| 104 | if (!eglChooseConfig(edpy, config_attr, &ecfg, 1, &num_config)) { |
| 105 | fprintf(stderr, "Failed to choose config (%x)\n", eglGetError()); |
| 106 | goto out; |
| 107 | } |
| 108 | |
| 109 | if (ecfg == NULL || num_config == 0) { |
| 110 | fprintf(stderr, "No EGL configs available\n"); |
| 111 | goto out; |
| 112 | } |
| 113 | |
| 114 | esfc = eglCreateWindowSurface(edpy, ecfg, |
| 115 | (EGLNativeWindowType)window, NULL); |
| 116 | if (esfc == EGL_NO_SURFACE) { |
| 117 | fprintf(stderr, "Unable to create EGL surface (%x)\n", |
| 118 | eglGetError()); |
| 119 | goto out; |
| 120 | } |
| 121 | |
| 122 | ectxt = eglCreateContext(edpy, ecfg, EGL_NO_CONTEXT, NULL); |
| 123 | if (ectxt == EGL_NO_CONTEXT) { |
| 124 | fprintf(stderr, "Unable to create EGL context (%x)\n", |
| 125 | eglGetError()); |
| 126 | // on mesa, some distros disable ES1.x but compat GL still works |
| 127 | ret = eglBindAPI(EGL_OPENGL_API); |
| 128 | if (!ret) { |
| 129 | fprintf(stderr, "eglBindAPI: %x\n", eglGetError()); |
| 130 | goto out; |
| 131 | } |
| 132 | ectxt = eglCreateContext(edpy, ecfg, EGL_NO_CONTEXT, NULL); |
| 133 | if (ectxt == EGL_NO_CONTEXT) { |
| 134 | fprintf(stderr, "giving up on EGL context (%x)\n", |
| 135 | eglGetError()); |
| 136 | goto out; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | ret = eglMakeCurrent(edpy, esfc, esfc, ectxt); |
| 141 | if (!ret) { |
| 142 | fprintf(stderr, "eglMakeCurrent: %x\n", eglGetError()); |
| 143 | goto out; |
| 144 | } |
| 145 | |
| 146 | ret = *quirks & GL_QUIRK_VSYNC_ON ? 1 : 0; |
| 147 | eglSwapInterval(edpy, ret); |
| 148 | |
| 149 | // 1.x (fixed-function) only |
| 150 | glEnable(GL_TEXTURE_2D); |
| 151 | glGetError(); |
| 152 | |
| 153 | assert(!texture_name); |
| 154 | |
| 155 | glGenTextures(1, &texture_name); |
| 156 | if (gl_have_error("glGenTextures")) |
| 157 | goto out; |
| 158 | |
| 159 | glBindTexture(GL_TEXTURE_2D, texture_name); |
| 160 | if (gl_have_error("glBindTexture")) |
| 161 | goto out; |
| 162 | |
| 163 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex_w, tex_h, 0, GL_RGB, |
| 164 | GL_UNSIGNED_SHORT_5_6_5, tex_mem); |
| 165 | if (gl_have_error("glTexImage2D")) |
| 166 | goto out; |
| 167 | |
| 168 | // no mipmaps |
| 169 | ret = *quirks & GL_QUIRK_SCALING_NEAREST ? GL_NEAREST : GL_LINEAR; |
| 170 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, ret); |
| 171 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, ret); |
| 172 | |
| 173 | //glViewport(0, 0, 512, 512); |
| 174 | glLoadIdentity(); |
| 175 | glFrontFace(GL_CW); |
| 176 | glEnable(GL_CULL_FACE); |
| 177 | |
| 178 | glEnableClientState(GL_TEXTURE_COORD_ARRAY); |
| 179 | glEnableClientState(GL_VERTEX_ARRAY); |
| 180 | |
| 181 | if (gl_have_error("init")) |
| 182 | goto out; |
| 183 | |
| 184 | gl_es_display = (void *)edpy; |
| 185 | gl_es_surface = (void *)esfc; |
| 186 | retval = 0; |
| 187 | out: |
| 188 | if (retval && edpy != EGL_NO_DISPLAY) |
| 189 | gl_destroy(); |
| 190 | return retval; |
| 191 | } |
| 192 | |
| 193 | void gl_announce(void) |
| 194 | { |
| 195 | printf("GL_RENDERER: %s\n", (char *)glGetString(GL_RENDERER)); |
| 196 | printf("GL_VERSION: %s\n", (char *)glGetString(GL_VERSION)); |
| 197 | } |
| 198 | |
| 199 | static const float default_vertices[] = { |
| 200 | -1.0f, 1.0f, 0.0f, // 0 0 1 |
| 201 | 1.0f, 1.0f, 0.0f, // 1 ^ |
| 202 | -1.0f, -1.0f, 0.0f, // 2 | 2 3 |
| 203 | 1.0f, -1.0f, 0.0f, // 3 +--> |
| 204 | }; |
| 205 | |
| 206 | static float texture[] = { |
| 207 | 0.0f, 0.0f, // we flip this: |
| 208 | 1.0f, 0.0f, // v^ |
| 209 | 0.0f, 1.0f, // | u |
| 210 | 1.0f, 1.0f, // +--> |
| 211 | }; |
| 212 | |
| 213 | int gl_flip_v(const void *fb, int w, int h, const float *vertices) |
| 214 | { |
| 215 | gl_have_error("pre-flip unknown"); |
| 216 | |
| 217 | glBindTexture(GL_TEXTURE_2D, texture_name); |
| 218 | if (gl_have_error("glBindTexture")) |
| 219 | return -1; |
| 220 | |
| 221 | if (fb != NULL) { |
| 222 | if (w != flip_old_w || h != flip_old_h) { |
| 223 | float f_w = (float)w / tex_w; |
| 224 | float f_h = (float)h / tex_h; |
| 225 | texture[1*2 + 0] = f_w; |
| 226 | texture[2*2 + 1] = f_h; |
| 227 | texture[3*2 + 0] = f_w; |
| 228 | texture[3*2 + 1] = f_h; |
| 229 | flip_old_w = w; |
| 230 | flip_old_h = h; |
| 231 | } |
| 232 | |
| 233 | glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h, |
| 234 | GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb); |
| 235 | if (gl_have_error("glTexSubImage2D")) { |
| 236 | fprintf(stderr, " %dx%d t: %dx%d %p\n", w, h, tex_w, tex_h, fb); |
| 237 | return -1; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | glVertexPointer(3, GL_FLOAT, 0, vertices ? vertices : default_vertices); |
| 242 | glTexCoordPointer(2, GL_FLOAT, 0, texture); |
| 243 | glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); |
| 244 | if (gl_have_error("glDrawArrays")) |
| 245 | return -1; |
| 246 | |
| 247 | eglSwapBuffers(edpy, esfc); |
| 248 | if (gles_have_error("eglSwapBuffers")) |
| 249 | return -1; |
| 250 | |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | int gl_flip(const void *fb, int w, int h) |
| 255 | { |
| 256 | return gl_flip_v(fb, w, h, NULL); |
| 257 | } |
| 258 | |
| 259 | // to be used once after exiting menu, etc |
| 260 | void gl_clear(void) |
| 261 | { |
| 262 | glClearColor(0, 0, 0, 0); |
| 263 | glClear(GL_COLOR_BUFFER_BIT); |
| 264 | eglSwapBuffers(edpy, esfc); |
| 265 | glClear(GL_COLOR_BUFFER_BIT); |
| 266 | eglSwapBuffers(edpy, esfc); |
| 267 | glClear(GL_COLOR_BUFFER_BIT); |
| 268 | gl_have_error("glClear"); |
| 269 | } |
| 270 | |
| 271 | void gl_destroy(void) |
| 272 | { |
| 273 | if (edpy == EGL_NO_DISPLAY) |
| 274 | return; // nothing to do |
| 275 | |
| 276 | // sometimes there is an error... from somewhere? |
| 277 | //gl_have_error("finish"); |
| 278 | glGetError(); |
| 279 | |
| 280 | if (texture_name) |
| 281 | { |
| 282 | glDeleteTextures(1, &texture_name); |
| 283 | gl_have_error("glDeleteTextures"); |
| 284 | texture_name = 0; |
| 285 | } |
| 286 | |
| 287 | eglMakeCurrent(edpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); |
| 288 | if (ectxt != EGL_NO_CONTEXT) { |
| 289 | eglDestroyContext(edpy, ectxt); |
| 290 | ectxt = EGL_NO_CONTEXT; |
| 291 | } |
| 292 | if (esfc != EGL_NO_SURFACE) { |
| 293 | eglDestroySurface(edpy, esfc); |
| 294 | esfc = EGL_NO_SURFACE; |
| 295 | } |
| 296 | |
| 297 | gl_es_surface = (void *)esfc; |
| 298 | |
| 299 | if (tex_mem) free(tex_mem); |
| 300 | tex_mem = NULL; |
| 301 | |
| 302 | gl_platform_destroy(); |
| 303 | } |
| 304 | |
| 305 | void gl_shutdown(void) |
| 306 | { |
| 307 | if (edpy != EGL_NO_DISPLAY) { |
| 308 | eglTerminate(edpy); |
| 309 | edpy = EGL_NO_DISPLAY; |
| 310 | } |
| 311 | |
| 312 | gl_es_display = (void *)edpy; |
| 313 | |
| 314 | gl_platform_shutdown(); |
| 315 | } |