+++ /dev/null
-#define GL_GLEXT_PROTOTYPES 1
-#define NO_SDL_GLEXT 1
-
-#define WIDTH 1280
-#define HEIGHT 720
-#define BUFFER_OFFSET(i) ((char *)NULL + (i))
-
-#define HSV_WHEEL_SIZE 128
-
-#include <math.h>
-#include <time.h>
-
-#include <SDL/SDL.h>
-#include <SDL/SDL_opengl.h>
-#include <SDL/SDL_image.h>
-
-#include <GL/gl.h>
-#include <GL/glext.h>
-
-#ifdef NDEBUG
-#define check_error()
-#else
-#define check_error() { int err = glGetError(); if (err != GL_NO_ERROR) { printf("GL error 0x%x at line %d\n", err, __LINE__); exit(1); } }
-#endif
-
-unsigned char result[WIDTH * HEIGHT * 4];
-
-float lift_theta = 0.0f, lift_rad = 0.0f, lift_v = 0.0f;
-float gamma_theta = 0.0f, gamma_rad = 0.0f, gamma_v = 0.5f;
-float gain_theta = 0.0f, gain_rad = 0.0f, gain_v = 0.25f;
-float saturation = 1.0f;
-
-float lift_r = 0.0f, lift_g = 0.0f, lift_b = 0.0f;
-float gamma_r = 1.0f, gamma_g = 1.0f, gamma_b = 1.0f;
-float gain_r = 1.0f, gain_g = 1.0f, gain_b = 1.0f;
-
-enum textures {
- SOURCE_IMAGE = 1,
- SRGB_LUT = 2,
- SRGB_REVERSE_LUT = 3,
- HSV_WHEEL = 4,
-};
-
-// assumes h in [0, 2pi> or [-pi, pi>
-void hsv2rgb(float h, float s, float v, float *r, float *g, float *b)
-{
- if (h < 0.0f) {
- h += 2.0f * M_PI;
- }
- float c = v * s;
- float hp = (h * 180.0 / M_PI) / 60.0;
- float x = c * (1 - fabs(fmod(hp, 2.0f) - 1.0f));
-
- if (hp >= 0 && hp < 1) {
- *r = c;
- *g = x;
- *b = 0.0f;
- } else if (hp >= 1 && hp < 2) {
- *r = x;
- *g = c;
- *b = 0.0f;
- } else if (hp >= 2 && hp < 3) {
- *r = 0.0f;
- *g = c;
- *b = x;
- } else if (hp >= 3 && hp < 4) {
- *r = 0.0f;
- *g = x;
- *b = c;
- } else if (hp >= 4 && hp < 5) {
- *r = x;
- *g = 0.0f;
- *b = c;
- } else {
- *r = c;
- *g = 0.0f;
- *b = x;
- }
-
- float m = v - c;
- *r += m;
- *g += m;
- *b += m;
-}
-
-GLhandleARB read_shader(const char* filename, GLenum type)
-{
- static char buf[131072];
- FILE *fp = fopen(filename, "r");
- if (fp == NULL) {
- perror(filename);
- exit(1);
- }
-
- int len = fread(buf, 1, sizeof(buf), fp);
- fclose(fp);
-
- GLhandleARB obj = glCreateShaderObjectARB(type);
- const GLchar* source[] = { buf };
- const GLint length[] = { len };
- glShaderSource(obj, 1, source, length);
- glCompileShader(obj);
-
- GLchar info_log[4096];
- GLsizei log_length = sizeof(info_log) - 1;
- glGetShaderInfoLog(obj, log_length, &log_length, info_log);
- info_log[log_length] = 0;
- printf("shader compile log: %s\n", info_log);
-
- GLint status;
- glGetShaderiv(obj, GL_COMPILE_STATUS, &status);
- if (status == GL_FALSE) {
- exit(1);
- }
-
- return obj;
-}
-
-void draw_picture_quad(GLint prog, int frame)
-{
- glUseProgramObjectARB(prog);
- check_error();
-
- glActiveTexture(GL_TEXTURE0);
- glBindTexture(GL_TEXTURE_2D, SOURCE_IMAGE);
- glUniform1i(glGetUniformLocation(prog, "tex"), 0);
-
- glActiveTexture(GL_TEXTURE1);
- glBindTexture(GL_TEXTURE_1D, SRGB_LUT);
- glUniform1i(glGetUniformLocation(prog, "srgb_tex"), 1);
-
- glActiveTexture(GL_TEXTURE2);
- glBindTexture(GL_TEXTURE_1D, SRGB_REVERSE_LUT);
- glUniform1i(glGetUniformLocation(prog, "srgb_reverse_tex"), 2);
-
- glUniform3f(glGetUniformLocation(prog, "lift"), lift_r, lift_g, lift_b);
- //glUniform3f(glGetUniformLocation(prog, "gamma"), gamma_r, gamma_g, gamma_b);
- glUniform3f(glGetUniformLocation(prog, "inv_gamma_22"),
- 2.2f / gamma_r,
- 2.2f / gamma_g,
- 2.2f / gamma_b);
- glUniform3f(glGetUniformLocation(prog, "gain_pow_inv_gamma"),
- pow(gain_r, 1.0f / gamma_r),
- pow(gain_g, 1.0f / gamma_g),
- pow(gain_b, 1.0f / gamma_b));
- glUniform1f(glGetUniformLocation(prog, "saturation"), saturation);
-
- glDisable(GL_BLEND);
- check_error();
- glDisable(GL_DEPTH_TEST);
- check_error();
- glDepthMask(GL_FALSE);
- check_error();
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0);
-
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-
- glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
-// glClear(GL_COLOR_BUFFER_BIT);
- check_error();
-
- glBegin(GL_QUADS);
-
- glTexCoord2f(0.0f, 1.0f);
- glVertex2f(0.0f, 0.0f);
-
- glTexCoord2f(1.0f, 1.0f);
- glVertex2f(1.0f, 0.0f);
-
- glTexCoord2f(1.0f, 0.0f);
- glVertex2f(1.0f, 1.0f);
-
- glTexCoord2f(0.0f, 0.0f);
- glVertex2f(0.0f, 1.0f);
-
- glEnd();
- check_error();
-}
-
-void draw_hsv_wheel(float y, float rad, float theta, float value)
-{
- glUseProgramObjectARB(0);
- check_error();
- glActiveTexture(GL_TEXTURE0);
- check_error();
- glEnable(GL_TEXTURE_2D);
- check_error();
- glBindTexture(GL_TEXTURE_2D, HSV_WHEEL);
- check_error();
- glActiveTexture(GL_TEXTURE1);
- check_error();
- glBindTexture(GL_TEXTURE_2D, 0);
- check_error();
- glActiveTexture(GL_TEXTURE0);
- glEnable(GL_BLEND);
- check_error();
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- check_error();
-
- // wheel
- glBegin(GL_QUADS);
-
- glTexCoord2f(0.0f, 1.0f);
- glVertex2f(0.0f, y);
-
- glTexCoord2f(1.0f, 1.0f);
- glVertex2f(0.2f * 9.0f / 16.0f, y);
-
- glTexCoord2f(1.0f, 0.0f);
- glVertex2f(0.2f * 9.0f / 16.0f, y + 0.2f);
-
- glTexCoord2f(0.0f, 0.0f);
- glVertex2f(0.0f, y + 0.2f);
-
- glEnd();
-
- // wheel selector
- glDisable(GL_TEXTURE_2D);
- glColor3f(0.0f, 0.0f, 0.0f);
- glPointSize(5.0f);
- glBegin(GL_POINTS);
- glVertex2f((0.1f + rad * cos(theta) * 0.1f) * 9.0f / 16.0f, y + 0.1f - rad * sin(theta) * 0.1f);
- glEnd();
-
- // value slider
- glDisable(GL_TEXTURE_2D);
- glBegin(GL_QUADS);
-
- glColor3f(0.0f, 0.0f, 0.0f);
- glVertex2f(0.22f * 9.0f / 16.0f, y);
- glVertex2f(0.24f * 9.0f / 16.0f, y);
-
- glColor3f(1.0f, 1.0f, 1.0f);
- glVertex2f(0.24f * 9.0f / 16.0f, y + 0.2f);
- glVertex2f(0.22f * 9.0f / 16.0f, y + 0.2f);
-
- glEnd();
-
- // value selector
- glColor3f(0.0f, 0.0f, 0.0f);
- glPointSize(5.0f);
- glBegin(GL_POINTS);
- glVertex2f(0.23f * 9.0f / 16.0f, y + value * 0.2f);
- glEnd();
-
- glColor3f(1.0f, 1.0f, 1.0f);
-}
-
-void draw_saturation_bar(float y)
-{
- glUseProgramObjectARB(0);
- check_error();
-
- // value slider
- glDisable(GL_TEXTURE_2D);
- glBegin(GL_QUADS);
-
- glColor3f(0.0f, 0.0f, 0.0f);
- glVertex2f(0.0f * 9.0f / 16.0f, y + 0.02f);
- glVertex2f(0.0f * 9.0f / 16.0f, y);
-
- glColor3f(1.0f, 1.0f, 1.0f);
- glVertex2f(0.2f * 9.0f / 16.0f, y);
- glVertex2f(0.2f * 9.0f / 16.0f, y + 0.02f);
-
- glEnd();
-
- // value selector
- glColor3f(0.0f, 0.0f, 0.0f);
- glPointSize(5.0f);
- glBegin(GL_POINTS);
- glVertex2f(0.2f * (saturation / 4.0f) * 9.0f / 16.0f, y + 0.01f);
- glEnd();
-
- glColor3f(1.0f, 1.0f, 1.0f);
-}
-
-void make_hsv_wheel_texture()
-{
- static unsigned char hsv_pix[HSV_WHEEL_SIZE * HSV_WHEEL_SIZE * 4];
- for (int y = 0; y < HSV_WHEEL_SIZE; ++y) {
- for (int x = 0; x < HSV_WHEEL_SIZE; ++x) {
- float yf = 2.0f * y / (float)(HSV_WHEEL_SIZE) - 1.0f;
- float xf = 2.0f * x / (float)(HSV_WHEEL_SIZE) - 1.0f;
- float rad = hypot(xf, yf);
- float theta = atan2(yf, xf);
-
- float r, g, b;
- hsv2rgb(theta, rad, 1.0f, &r, &g, &b);
- hsv_pix[(y * HSV_WHEEL_SIZE + x) * 4 + 0] = lrintf(r * 255.0f);
- hsv_pix[(y * HSV_WHEEL_SIZE + x) * 4 + 1] = lrintf(g * 255.0f);
- hsv_pix[(y * HSV_WHEEL_SIZE + x) * 4 + 2] = lrintf(b * 255.0f);
-
- if (rad > 1.0f) {
- hsv_pix[(y * HSV_WHEEL_SIZE + x) * 4 + 3] = 0;
- } else {
- hsv_pix[(y * HSV_WHEEL_SIZE + x) * 4 + 3] = 255;
- }
- }
- printf("\n");
- }
-
- glBindTexture(GL_TEXTURE_2D, HSV_WHEEL);
- check_error();
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- check_error();
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, HSV_WHEEL_SIZE, HSV_WHEEL_SIZE, 0, GL_RGBA, GL_UNSIGNED_BYTE, hsv_pix);
- check_error();
-}
-
-void update_hsv()
-{
- hsv2rgb(lift_theta, lift_rad, lift_v, &lift_r, &lift_g, &lift_b);
- hsv2rgb(gamma_theta, gamma_rad, gamma_v * 2.0f, &gamma_r, &gamma_g, &gamma_b);
- hsv2rgb(gain_theta, gain_rad, gain_v * 4.0f, &gain_r, &gain_g, &gain_b);
-
- if (saturation < 0.0) {
- saturation = 0.0;
- }
-
- printf("lift: %f %f %f\n", lift_r, lift_g, lift_b);
- printf("gamma: %f %f %f\n", gamma_r, gamma_g, gamma_b);
- printf("gain: %f %f %f\n", gain_r, gain_g, gain_b);
- printf("saturation: %f\n", saturation);
- printf("\n");
-}
-
-void read_colorwheel(float xf, float yf, float *rad, float *theta, float *value)
-{
- if (xf < 0.2f && yf < 0.2f) {
- float xp = 2.0f * xf / 0.2f - 1.0f;
- float yp = -(2.0f * yf / 0.2f - 1.0f);
- *rad = hypot(xp, yp);
- *theta = atan2(yp, xp);
- if (*rad > 1.0) {
- *rad = 1.0;
- }
- } else if (xf >= 0.22f && xf <= 0.24f) {
- *value = yf / 0.2f;
- }
-}
-
-void mouse(int x, int y)
-{
- float xf = (x / (float)WIDTH) * 16.0f / 9.0f;
- float yf = (HEIGHT - y) / (float)HEIGHT;
-
- if (yf < 0.2f) {
- read_colorwheel(xf, yf, &lift_rad, &lift_theta, &lift_v);
- } else if (yf >= 0.2f && yf < 0.4f) {
- read_colorwheel(xf, yf - 0.2f, &gamma_rad, &gamma_theta, &gamma_v);
- } else if (yf >= 0.4f && yf < 0.6f) {
- read_colorwheel(xf, yf - 0.4f, &gain_rad, &gain_theta, &gain_v);
- } else if (yf >= 0.6f && yf < 0.62f && xf < 0.2f) {
- saturation = (xf / 0.2f) * 4.0f;
- }
-
- update_hsv();
-}
-
-void load_texture(const char *filename)
-{
- SDL_Surface *img = IMG_Load(filename);
- if (img == NULL) {
- fprintf(stderr, "Load of '%s' failed\n", filename);
- exit(1);
- }
-
- // Convert to RGB.
- SDL_PixelFormat *fmt = img->format;
- SDL_LockSurface(img);
- unsigned char *src_pixels = (unsigned char *)img->pixels;
- unsigned char *dst_pixels = (unsigned char *)malloc(img->w * img->h * 3);
- for (unsigned i = 0; i < img->w * img->h; ++i) {
- unsigned char r, g, b;
- unsigned int temp;
- unsigned int pixel = *(unsigned int *)(src_pixels + i * fmt->BytesPerPixel);
-
- temp = pixel & fmt->Rmask;
- temp = temp >> fmt->Rshift;
- temp = temp << fmt->Rloss;
- r = temp;
-
- temp = pixel & fmt->Gmask;
- temp = temp >> fmt->Gshift;
- temp = temp << fmt->Gloss;
- g = temp;
-
- temp = pixel & fmt->Bmask;
- temp = temp >> fmt->Bshift;
- temp = temp << fmt->Bloss;
- b = temp;
-
- dst_pixels[i * 3 + 0] = r;
- dst_pixels[i * 3 + 1] = g;
- dst_pixels[i * 3 + 2] = b;
- }
- SDL_UnlockSurface(img);
-
-#if 1
- // we will convert to sRGB in the shader
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, img->w, img->h, 0, GL_RGB, GL_UNSIGNED_BYTE, dst_pixels);
- check_error();
-#else
- // implicit sRGB conversion in hardware
- glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8, img->w, img->h, 0, GL_RGB, GL_UNSIGNED_BYTE, dst_pixels);
- check_error();
-#endif
- free(dst_pixels);
- SDL_FreeSurface(img);
-}
-
-void write_ppm(const char *filename, unsigned char *screenbuf)
-{
- FILE *fp = fopen(filename, "w");
- fprintf(fp, "P6\n%d %d\n255\n", WIDTH, HEIGHT);
- for (unsigned y = 0; y < HEIGHT; ++y) {
- unsigned char *srcptr = screenbuf + ((HEIGHT - y - 1) * WIDTH) * 4;
- for (unsigned x = 0; x < WIDTH; ++x) {
- fputc(srcptr[x * 4 + 2], fp);
- fputc(srcptr[x * 4 + 1], fp);
- fputc(srcptr[x * 4 + 0], fp);
- }
- }
- fclose(fp);
-}
-
-int main(int argc, char **argv)
-{
- int quit = 0;
-
- SDL_Init(SDL_INIT_EVERYTHING);
- SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
- SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 0);
- SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
- SDL_SetVideoMode(WIDTH, HEIGHT, 0, SDL_OPENGL);
- SDL_WM_SetCaption("OpenGL window", NULL);
-
- // geez
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- glPixelStorei(GL_PACK_ALIGNMENT, 1);
-
- glBindTexture(GL_TEXTURE_2D, SOURCE_IMAGE);
- check_error();
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- check_error();
-
- load_texture("blg_wheels_woman_1.jpg");
- //glGenerateMipmap(GL_TEXTURE_2D);
- //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 4);
- //check_error();
-
- //load_texture("maserati_gts_wallpaper_1280x720_01.jpg");
- //load_texture("90630d1295075297-console-games-wallpapers-wallpaper_need_for_speed_prostreet_09_1920x1080.jpg");
- //load_texture("glacier-lake-1280-720-4087.jpg");
-
-#if 0
- // sRGB reverse LUT
- glBindTexture(GL_TEXTURE_1D, SRGB_REVERSE_LUT);
- check_error();
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
- check_error();
- float srgb_reverse_tex[4096];
- for (unsigned i = 0; i < 4096; ++i) {
- float x = i / 4095.0;
- if (x < 0.0031308f) {
- srgb_reverse_tex[i] = 12.92f * x;
- } else {
- srgb_reverse_tex[i] = 1.055f * pow(x, 1.0f / 2.4f) - 0.055f;
- }
- }
- glTexImage1D(GL_TEXTURE_1D, 0, GL_LUMINANCE16F_ARB, 4096, 0, GL_LUMINANCE, GL_FLOAT, srgb_reverse_tex);
- check_error();
-
- // sRGB LUT
- glBindTexture(GL_TEXTURE_1D, SRGB_LUT);
- check_error();
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
- check_error();
- float srgb_tex[256];
- for (unsigned i = 0; i < 256; ++i) {
- float x = i / 255.0;
- if (x < 0.04045f) {
- srgb_tex[i] = x * (1.0f / 12.92f);
- } else {
- srgb_tex[i] = pow((x + 0.055) * (1.0 / 1.055f), 2.4);
- }
- }
- glTexImage1D(GL_TEXTURE_1D, 0, GL_LUMINANCE16F_ARB, 256, 0, GL_LUMINANCE, GL_FLOAT, srgb_tex);
- check_error();
-#endif
-
- // generate a PDO to hold the data we read back with glReadPixels()
- // (Intel/DRI goes into a slow path if we don't read to PDO)
- glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 1);
- glBufferData(GL_PIXEL_PACK_BUFFER_ARB, WIDTH * HEIGHT * 4, NULL, GL_STREAM_READ);
-
- make_hsv_wheel_texture();
- update_hsv();
-
- int prog = glCreateProgram();
- GLhandleARB vs_obj = read_shader("vs.glsl", GL_VERTEX_SHADER);
- GLhandleARB fs_obj = read_shader("fs.glsl", GL_FRAGMENT_SHADER);
- glAttachObjectARB(prog, vs_obj);
- check_error();
- glAttachObjectARB(prog, fs_obj);
- check_error();
- glLinkProgram(prog);
- check_error();
-
- GLchar info_log[4096];
- GLsizei log_length = sizeof(info_log) - 1;
- log_length = sizeof(info_log) - 1;
- glGetProgramInfoLog(prog, log_length, &log_length, info_log);
- info_log[log_length] = 0;
- printf("link: %s\n", info_log);
-
- struct timespec start, now;
- int frame = 0, screenshot = 0;
- clock_gettime(CLOCK_MONOTONIC, &start);
-
- while (!quit) {
- SDL_Event event;
- while (SDL_PollEvent(&event)) {
- if (event.type == SDL_QUIT) {
- quit = 1;
- } else if (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_ESCAPE) {
- quit = 1;
- } else if (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_F1) {
- screenshot = 1;
- } else if (event.type == SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT) {
- mouse(event.button.x, event.button.y);
- } else if (event.type == SDL_MOUSEMOTION && (event.motion.state & SDL_BUTTON(1))) {
- mouse(event.motion.x, event.motion.y);
- }
- }
-
- ++frame;
-
- draw_picture_quad(prog, frame);
-
- glReadPixels(0, 0, WIDTH, HEIGHT, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, BUFFER_OFFSET(0));
- check_error();
-
- draw_hsv_wheel(0.0f, lift_rad, lift_theta, lift_v);
- draw_hsv_wheel(0.2f, gamma_rad, gamma_theta, gamma_v);
- draw_hsv_wheel(0.4f, gain_rad, gain_theta, gain_v);
- draw_saturation_bar(0.6f);
-
- SDL_GL_SwapBuffers();
- check_error();
-
- unsigned char *screenbuf = glMapBuffer(GL_PIXEL_PACK_BUFFER_ARB, GL_READ_ONLY);
- check_error();
- if (screenshot) {
- char filename[256];
- sprintf(filename, "frame%05d.ppm", frame);
- write_ppm(filename, screenbuf);
- printf("Screenshot: %s\n", filename);
- screenshot = 0;
- }
- glUnmapBuffer(GL_PIXEL_PACK_BUFFER_ARB);
- check_error();
-
-#if 1
- clock_gettime(CLOCK_MONOTONIC, &now);
- double elapsed = now.tv_sec - start.tv_sec +
- 1e-9 * (now.tv_nsec - start.tv_nsec);
- printf("%d frames in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
- frame, elapsed, frame / elapsed,
- 1e3 * elapsed / frame);
-#endif
- }
- return 0;
-}
projects / movit / blobdiff