#define HEIGHT 720
#define BUFFER_OFFSET(i) ((char *)NULL + (i))
-#define HSV_WHEEL_SIZE 128
-
#include <math.h>
#include <time.h>
+#include <string>
+#include <vector>
+
#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
+#include "util.h"
+#include "widgets.h"
+#include "texture_enum.h"
unsigned char result[WIDTH * HEIGHT * 4];
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,
+struct ImageFormat {
+ enum { FORMAT_RGB, FORMAT_RGBA } format;
+
+ // Note: sRGB and 709 use the same colorspace primaries.
+ enum { COLORSPACE_sRGB, COLORSPACE_REC_601_525, COLORSPACE_REC_601_625, COLORSPACE_REC_709 } color_space;
+
+ // Note: Rec. 601 and 709 use the same gamma curve.
+ enum { LINEAR_LIGHT, GAMMA_sRGB, GAMMA_REC_601, GAMMA_REC_709 } gamma_curve;
};
-// 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;
- }
+enum EffectId {
+ // Mostly for internal use.
+ GAMMA_CONVERSION = 0,
+ RGB_PRIMARIES_CONVERSION,
- float m = v - c;
- *r += m;
- *g += m;
- *b += m;
-}
+ // Color.
+ LIFT_GAMMA_GAIN,
+};
+
+class Effect {
+public:
+ virtual bool needs_linear_light() { return true; }
+ virtual bool needs_srgb_primaries() { return true; }
+ virtual bool needs_many_samples() { return false; }
+ virtual bool needs_mipmaps() { return false; }
+ bool set_float(const std::string& key, float value);
+ bool set_float_array(const std::string&, const float *values, size_t num_values);
+
+private:
+ bool register_float(const std::string& key, float value);
+ bool register_float_array(const std::string& key, float *values, size_t num_values);
+};
+
+class EffectChain {
+public:
+ void set_size(unsigned width, unsigned height);
+ void add_input(const ImageFormat &format);
+ Effect *add_effect(EffectId effect);
+ void add_output(const ImageFormat &format);
+
+ void render(unsigned char *src, unsigned char *dst);
+
+private:
+ unsigned width, height;
+ ImageFormat input_format, output_format;
+ std::vector<Effect *> effects;
+};
GLhandleARB read_shader(const char* filename, GLenum type)
{
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);
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;
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);
+ draw_saturation_bar(0.6f, saturation);
SDL_GL_SwapBuffers();
check_error();
projects / movit / blobdiff