1 #define GL_GLEXT_PROTOTYPES 1
18 #include <SDL/SDL_opengl.h>
19 #include <SDL/SDL_image.h>
25 #include "effect_chain.h"
29 unsigned char result[WIDTH * HEIGHT * 4];
31 float lift_theta = 0.0f, lift_rad = 0.0f, lift_v = 0.0f;
32 float gamma_theta = 0.0f, gamma_rad = 0.0f, gamma_v = 0.5f;
33 float gain_theta = 0.0f, gain_rad = 0.0f, gain_v = 0.25f;
34 float saturation = 1.0f;
37 float inner_radius = 0.3f;
39 void update_hsv(Effect *lift_gamma_gain_effect, Effect *saturation_effect)
41 RGBTriplet lift(0.0f, 0.0f, 0.0f);
42 RGBTriplet gamma(1.0f, 1.0f, 1.0f);
43 RGBTriplet gain(1.0f, 1.0f, 1.0f);
45 hsv2rgb(lift_theta, lift_rad, lift_v, &lift.r, &lift.g, &lift.b);
46 hsv2rgb(gamma_theta, gamma_rad, gamma_v * 2.0f, &gamma.r, &gamma.g, &gamma.b);
47 hsv2rgb(gain_theta, gain_rad, gain_v * 4.0f, &gain.r, &gain.g, &gain.b);
49 bool ok = lift_gamma_gain_effect->set_vec3("lift", (float *)&lift);
50 ok = ok && lift_gamma_gain_effect->set_vec3("gamma", (float *)&gamma);
51 ok = ok && lift_gamma_gain_effect->set_vec3("gain", (float *)&gain);
54 if (saturation < 0.0) {
57 ok = saturation_effect->set_float("saturation", saturation);
61 void mouse(int x, int y)
63 float xf = (x / (float)WIDTH) * 16.0f / 9.0f;
64 float yf = (HEIGHT - y) / (float)HEIGHT;
67 read_colorwheel(xf, yf, &lift_rad, &lift_theta, &lift_v);
68 } else if (yf >= 0.2f && yf < 0.4f) {
69 read_colorwheel(xf, yf - 0.2f, &gamma_rad, &gamma_theta, &gamma_v);
70 } else if (yf >= 0.4f && yf < 0.6f) {
71 read_colorwheel(xf, yf - 0.4f, &gain_rad, &gain_theta, &gain_v);
72 } else if (yf >= 0.6f && yf < 0.62f && xf < 0.2f) {
73 saturation = (xf / 0.2f) * 4.0f;
74 } else if (yf >= 0.65f && yf < 0.67f && xf < 0.2f) {
76 } else if (yf >= 0.70f && yf < 0.72f && xf < 0.2f) {
77 inner_radius = (xf / 0.2f);
81 unsigned char *load_image(const char *filename, unsigned *w, unsigned *h)
83 SDL_Surface *img = IMG_Load(filename);
85 fprintf(stderr, "Load of '%s' failed\n", filename);
90 SDL_PixelFormat *fmt = img->format;
92 unsigned char *src_pixels = (unsigned char *)img->pixels;
93 unsigned char *dst_pixels = (unsigned char *)malloc(img->w * img->h * 4);
94 for (int i = 0; i < img->w * img->h; ++i) {
95 unsigned char r, g, b;
97 unsigned int pixel = *(unsigned int *)(src_pixels + i * fmt->BytesPerPixel);
99 temp = pixel & fmt->Rmask;
100 temp = temp >> fmt->Rshift;
101 temp = temp << fmt->Rloss;
104 temp = pixel & fmt->Gmask;
105 temp = temp >> fmt->Gshift;
106 temp = temp << fmt->Gloss;
109 temp = pixel & fmt->Bmask;
110 temp = temp >> fmt->Bshift;
111 temp = temp << fmt->Bloss;
114 dst_pixels[i * 4 + 0] = b;
115 dst_pixels[i * 4 + 1] = g;
116 dst_pixels[i * 4 + 2] = r;
117 dst_pixels[i * 4 + 3] = 255;
119 SDL_UnlockSurface(img);
124 SDL_FreeSurface(img);
129 void write_ppm(const char *filename, unsigned char *screenbuf)
131 FILE *fp = fopen(filename, "w");
132 fprintf(fp, "P6\n%d %d\n255\n", WIDTH, HEIGHT);
133 for (unsigned y = 0; y < HEIGHT; ++y) {
134 unsigned char *srcptr = screenbuf + ((HEIGHT - y - 1) * WIDTH) * 4;
135 for (unsigned x = 0; x < WIDTH; ++x) {
136 fputc(srcptr[x * 4 + 2], fp);
137 fputc(srcptr[x * 4 + 1], fp);
138 fputc(srcptr[x * 4 + 0], fp);
144 int main(int argc, char **argv)
148 SDL_Init(SDL_INIT_EVERYTHING);
149 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
150 SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 0);
151 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
152 SDL_SetVideoMode(WIDTH, HEIGHT, 0, SDL_OPENGL);
153 SDL_WM_SetCaption("OpenGL window", NULL);
156 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
157 glPixelStorei(GL_PACK_ALIGNMENT, 1);
159 unsigned img_w, img_h;
160 unsigned char *src_img = load_image("blg_wheels_woman_1.jpg", &img_w, &img_h);
162 EffectChain chain(WIDTH, HEIGHT);
164 ImageFormat inout_format;
165 inout_format.pixel_format = FORMAT_BGRA;
166 inout_format.color_space = COLORSPACE_sRGB;
167 inout_format.gamma_curve = GAMMA_sRGB;
169 chain.add_input(inout_format);
170 Effect *lift_gamma_gain_effect = chain.add_effect(EFFECT_LIFT_GAMMA_GAIN);
171 Effect *saturation_effect = chain.add_effect(EFFECT_SATURATION);
172 Effect *vignette_effect = chain.add_effect(EFFECT_VIGNETTE);
173 //chain.add_effect(EFFECT_MIRROR);
174 chain.add_output(inout_format);
177 //glGenerateMipmap(GL_TEXTURE_2D);
178 //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 4);
181 // generate a PDO to hold the data we read back with glReadPixels()
182 // (Intel/DRI goes into a slow path if we don't read to PDO)
183 glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 1);
184 glBufferData(GL_PIXEL_PACK_BUFFER_ARB, WIDTH * HEIGHT * 4, NULL, GL_STREAM_READ);
186 make_hsv_wheel_texture();
188 int frame = 0, screenshot = 0;
189 #if _POSIX_C_SOURCE >= 199309L
190 struct timespec start, now;
191 clock_gettime(CLOCK_MONOTONIC, &start);
193 struct timeval start, now;
194 gettimeofday(&start, NULL);
199 while (SDL_PollEvent(&event)) {
200 if (event.type == SDL_QUIT) {
202 } else if (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_ESCAPE) {
204 } else if (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_F1) {
206 } else if (event.type == SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT) {
207 mouse(event.button.x, event.button.y);
208 } else if (event.type == SDL_MOUSEMOTION && (event.motion.state & SDL_BUTTON(1))) {
209 mouse(event.motion.x, event.motion.y);
215 update_hsv(lift_gamma_gain_effect, saturation_effect);
216 vignette_effect->set_float("radius", radius);
217 vignette_effect->set_float("inner_radius", inner_radius);
218 //vignette_effect->set_vec2("center", (float[]){ 0.7f, 0.5f });
219 chain.render_to_screen(src_img);
221 glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 1);
223 glReadPixels(0, 0, WIDTH, HEIGHT, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, BUFFER_OFFSET(0));
225 glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 0);
228 draw_hsv_wheel(0.0f, lift_rad, lift_theta, lift_v);
229 draw_hsv_wheel(0.2f, gamma_rad, gamma_theta, gamma_v);
230 draw_hsv_wheel(0.4f, gain_rad, gain_theta, gain_v);
231 draw_saturation_bar(0.6f, saturation / 4.0f);
232 draw_saturation_bar(0.65f, radius);
233 draw_saturation_bar(0.70f, inner_radius);
235 SDL_GL_SwapBuffers();
238 glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 1);
240 unsigned char *screenbuf = (unsigned char *)glMapBuffer(GL_PIXEL_PACK_BUFFER_ARB, GL_READ_ONLY);
244 sprintf(filename, "frame%05d.ppm", frame);
245 write_ppm(filename, screenbuf);
246 printf("Screenshot: %s\n", filename);
249 glUnmapBuffer(GL_PIXEL_PACK_BUFFER_ARB);
251 glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 0);
255 #if _POSIX_C_SOURCE >= 199309L
256 clock_gettime(CLOCK_MONOTONIC, &now);
257 double elapsed = now.tv_sec - start.tv_sec +
258 1e-9 * (now.tv_nsec - start.tv_nsec);
260 gettimeofday(&now, NULL);
261 double elapsed = now.tv_sec - start.tv_sec +
262 1e-6 * (now.tv_usec - start.tv_usec);
264 printf("%d frames in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
265 frame, elapsed, frame / elapsed,
266 1e3 * elapsed / frame);