git.sesse.net Git - movit/blob - main.cpp

   1 #define GL_GLEXT_PROTOTYPES 1
   2 #define NO_SDL_GLEXT 1
   3
   4 #define WIDTH 1280
   5 #define HEIGHT 720
   6 #define BUFFER_OFFSET(i) ((char *)NULL + (i))
   7
   8 #include <string.h>
   9 #include <math.h>
  10 #include <time.h>
  11 #include <assert.h>
  12
  13 #include <string>
  14 #include <vector>
  15 #include <map>
  16
  17 #include <SDL/SDL.h>
  18 #include <SDL/SDL_opengl.h>
  19 #include <SDL/SDL_image.h>
  20
  21 #include <GL/gl.h>
  22 #include <GL/glext.h>
  23
  24 #include "effect.h"
  25 #include "effect_chain.h"
  26 #include "util.h"
  27 #include "widgets.h"
  28 #include "texture_enum.h"
  29
  30 unsigned char result[WIDTH * HEIGHT * 4];
  31
  32 float lift_theta = 0.0f, lift_rad = 0.0f, lift_v = 0.0f;
  33 float gamma_theta = 0.0f, gamma_rad = 0.0f, gamma_v = 0.5f;
  34 float gain_theta = 0.0f, gain_rad = 0.0f, gain_v = 0.25f;
  35 float saturation = 1.0f;
  36
  37 void update_hsv(Effect *lift_gamma_gain_effect, Effect *saturation_effect)
  38 {
  39         RGBTriplet lift(0.0f, 0.0f, 0.0f);
  40         RGBTriplet gamma(1.0f, 1.0f, 1.0f);
  41         RGBTriplet gain(1.0f, 1.0f, 1.0f);
  42
  43         hsv2rgb(lift_theta, lift_rad, lift_v, &lift.r, &lift.g, &lift.b);
  44         hsv2rgb(gamma_theta, gamma_rad, gamma_v * 2.0f, &gamma.r, &gamma.g, &gamma.b);
  45         hsv2rgb(gain_theta, gain_rad, gain_v * 4.0f, &gain.r, &gain.g, &gain.b);
  46
  47         bool ok = lift_gamma_gain_effect->set_vec3("lift", (float *)&lift);
  48         ok = ok && lift_gamma_gain_effect->set_vec3("gamma", (float *)&gamma);
  49         ok = ok && lift_gamma_gain_effect->set_vec3("gain", (float *)&gain);
  50         assert(ok);
  51
  52         if (saturation < 0.0) {
  53                 saturation = 0.0;
  54         }
  55         ok = saturation_effect->set_float("saturation", saturation);
  56         assert(ok);
  57 }
  58
  59 void mouse(int x, int y)
  60 {
  61         float xf = (x / (float)WIDTH) * 16.0f / 9.0f;
  62         float yf = (HEIGHT - y) / (float)HEIGHT;
  63
  64         if (yf < 0.2f) {
  65                 read_colorwheel(xf, yf, &lift_rad, &lift_theta, &lift_v);
  66         } else if (yf >= 0.2f && yf < 0.4f) {
  67                 read_colorwheel(xf, yf - 0.2f, &gamma_rad, &gamma_theta, &gamma_v);
  68         } else if (yf >= 0.4f && yf < 0.6f) {
  69                 read_colorwheel(xf, yf - 0.4f, &gain_rad, &gain_theta, &gain_v);
  70         } else if (yf >= 0.6f && yf < 0.62f && xf < 0.2f) {
  71                 saturation = (xf / 0.2f) * 4.0f;
  72         }
  73 }
  74
  75 unsigned char *load_image(const char *filename, unsigned *w, unsigned *h)
  76 {
  77         SDL_Surface *img = IMG_Load(filename);
  78         if (img == NULL) {
  79                 fprintf(stderr, "Load of '%s' failed\n", filename);
  80                 exit(1);
  81         }
  82
  83         // Convert to RGB.
  84         SDL_PixelFormat *fmt = img->format;
  85         SDL_LockSurface(img);
  86         unsigned char *src_pixels = (unsigned char *)img->pixels;
  87         unsigned char *dst_pixels = (unsigned char *)malloc(img->w * img->h * 3);
  88         for (unsigned i = 0; i < img->w * img->h; ++i) {
  89                 unsigned char r, g, b;
  90                 unsigned int temp;
  91                 unsigned int pixel = *(unsigned int *)(src_pixels + i * fmt->BytesPerPixel);
  92
  93                 temp = pixel & fmt->Rmask;
  94                 temp = temp >> fmt->Rshift;
  95                 temp = temp << fmt->Rloss;
  96                 r = temp;
  97
  98                 temp = pixel & fmt->Gmask;
  99                 temp = temp >> fmt->Gshift;
 100                 temp = temp << fmt->Gloss;
 101                 g = temp;
 102
 103                 temp = pixel & fmt->Bmask;
 104                 temp = temp >> fmt->Bshift;
 105                 temp = temp << fmt->Bloss;
 106                 b = temp;
 107
 108                 dst_pixels[i * 3 + 0] = r;
 109                 dst_pixels[i * 3 + 1] = g;
 110                 dst_pixels[i * 3 + 2] = b;
 111         }
 112         SDL_UnlockSurface(img);
 113
 114         *w = img->w;
 115         *h = img->h;
 116
 117         SDL_FreeSurface(img);
 118
 119         return dst_pixels;
 120 }
 121
 122 void write_ppm(const char *filename, unsigned char *screenbuf)
 123 {
 124         FILE *fp = fopen(filename, "w");
 125         fprintf(fp, "P6\n%d %d\n255\n", WIDTH, HEIGHT);
 126         for (unsigned y = 0; y < HEIGHT; ++y) {
 127                 unsigned char *srcptr = screenbuf + ((HEIGHT - y - 1) * WIDTH) * 4;
 128                 for (unsigned x = 0; x < WIDTH; ++x) {
 129                         fputc(srcptr[x * 4 + 2], fp);
 130                         fputc(srcptr[x * 4 + 1], fp);
 131                         fputc(srcptr[x * 4 + 0], fp);
 132                 }
 133         }
 134         fclose(fp);
 135 }
 136
 137 int main(int argc, char **argv)
 138 {
 139         int quit = 0;
 140
 141         SDL_Init(SDL_INIT_EVERYTHING);
 142         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
 143         SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 0);
 144         SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 145         SDL_SetVideoMode(WIDTH, HEIGHT, 0, SDL_OPENGL);
 146         SDL_WM_SetCaption("OpenGL window", NULL);
 147
 148         // geez
 149         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 150         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 151
 152         glBindTexture(GL_TEXTURE_2D, SOURCE_IMAGE);
 153         check_error();
 154         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 155         check_error();
 156
 157         unsigned img_w, img_h;
 158         unsigned char *src_img = load_image("blg_wheels_woman_1.jpg", &img_w, &img_h);
 159
 160         EffectChain chain(WIDTH, HEIGHT);
 161
 162         ImageFormat inout_format;
 163         inout_format.pixel_format = FORMAT_RGB;
 164         inout_format.color_space = COLORSPACE_sRGB;
 165         inout_format.gamma_curve = GAMMA_sRGB;
 166
 167         chain.add_input(inout_format);
 168         Effect *lift_gamma_gain_effect = chain.add_effect(EFFECT_LIFT_GAMMA_GAIN);
 169         Effect *saturation_effect = chain.add_effect(EFFECT_SATURATION);
 170         chain.add_output(inout_format);
 171         chain.finalize();
 172
 173         //glGenerateMipmap(GL_TEXTURE_2D);
 174         //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 4);
 175         //check_error();
 176
 177 #if 0
 178         // sRGB reverse LUT
 179         glBindTexture(GL_TEXTURE_1D, SRGB_REVERSE_LUT);
 180         check_error();
 181         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 182         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 183         check_error();
 184         float srgb_reverse_tex[4096];
 185         for (unsigned i = 0; i < 4096; ++i) {
 186                 float x = i / 4095.0;
 187                 if (x < 0.0031308f) {
 188                         srgb_reverse_tex[i] = 12.92f * x;
 189                 } else {
 190                         srgb_reverse_tex[i] = 1.055f * pow(x, 1.0f / 2.4f) - 0.055f;
 191                 }
 192         }
 193         glTexImage1D(GL_TEXTURE_1D, 0, GL_LUMINANCE16F_ARB, 4096, 0, GL_LUMINANCE, GL_FLOAT, srgb_reverse_tex);
 194         check_error();
 195
 196         // sRGB LUT
 197         glBindTexture(GL_TEXTURE_1D, SRGB_LUT);
 198         check_error();
 199         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 200         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 201         check_error();
 202         float srgb_tex[256];
 203         for (unsigned i = 0; i < 256; ++i) {
 204                 float x = i / 255.0;
 205                 if (x < 0.04045f) {
 206                         srgb_tex[i] = x * (1.0f / 12.92f);
 207                 } else {
 208                         srgb_tex[i] = pow((x + 0.055) * (1.0 / 1.055f), 2.4);
 209                 }
 210         }
 211         glTexImage1D(GL_TEXTURE_1D, 0, GL_LUMINANCE16F_ARB, 256, 0, GL_LUMINANCE, GL_FLOAT, srgb_tex);
 212         check_error();
 213 #endif
 214
 215         // generate a PDO to hold the data we read back with glReadPixels()
 216         // (Intel/DRI goes into a slow path if we don't read to PDO)
 217         glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 1);
 218         glBufferData(GL_PIXEL_PACK_BUFFER_ARB, WIDTH * HEIGHT * 4, NULL, GL_STREAM_READ);
 219
 220         make_hsv_wheel_texture();
 221
 222         struct timespec start, now;
 223         int frame = 0, screenshot = 0;
 224         clock_gettime(CLOCK_MONOTONIC, &start);
 225
 226         while (!quit) {
 227                 SDL_Event event;
 228                 while (SDL_PollEvent(&event)) {
 229                         if (event.type == SDL_QUIT) {
 230                                 quit = 1;
 231                         } else if (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_ESCAPE) {
 232                                 quit = 1;
 233                         } else if (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_F1) {
 234                                 screenshot = 1;
 235                         } else if (event.type == SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT) {
 236                                 mouse(event.button.x, event.button.y);
 237                         } else if (event.type == SDL_MOUSEMOTION && (event.motion.state & SDL_BUTTON(1))) {
 238                                 mouse(event.motion.x, event.motion.y);
 239                         }
 240                 }
 241
 242                 ++frame;
 243
 244                 update_hsv(lift_gamma_gain_effect, saturation_effect);
 245                 chain.render_to_screen(src_img);
 246
 247                 glReadPixels(0, 0, WIDTH, HEIGHT, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, BUFFER_OFFSET(0));
 248                 check_error();
 249
 250                 draw_hsv_wheel(0.0f, lift_rad, lift_theta, lift_v);
 251                 draw_hsv_wheel(0.2f, gamma_rad, gamma_theta, gamma_v);
 252                 draw_hsv_wheel(0.4f, gain_rad, gain_theta, gain_v);
 253                 draw_saturation_bar(0.6f, saturation);
 254
 255                 SDL_GL_SwapBuffers();
 256                 check_error();
 257
 258                 unsigned char *screenbuf = (unsigned char *)glMapBuffer(GL_PIXEL_PACK_BUFFER_ARB, GL_READ_ONLY);
 259                 check_error();
 260                 if (screenshot) {
 261                         char filename[256];
 262                         sprintf(filename, "frame%05d.ppm", frame);
 263                         write_ppm(filename, screenbuf);
 264                         printf("Screenshot: %s\n", filename);
 265                         screenshot = 0;
 266                 }
 267                 glUnmapBuffer(GL_PIXEL_PACK_BUFFER_ARB);
 268                 check_error();
 269
 270 #if 1
 271                 clock_gettime(CLOCK_MONOTONIC, &now);
 272                 double elapsed = now.tv_sec - start.tv_sec +
 273                         1e-9 * (now.tv_nsec - start.tv_nsec);
 274                 printf("%d frames in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
 275                         frame, elapsed, frame / elapsed,
 276                         1e3 * elapsed / frame);
 277 #endif
 278         }
 279         return 0;
 280 }