Move the widgets into its own source file.

[movit] / widgets.cpp

diff --git a/widgets.cpp b/widgets.cpp
new file mode 100644 (file)
index 0000000..529212f
--- /dev/null
+++ b/widgets.cpp
@@ -0,0 +1,158 @@
+#define GL_GLEXT_PROTOTYPES 1
+
+#include <math.h>
+#include <GL/gl.h>
+#include <GL/glext.h>
+
+#include "widgets.h"
+#include "util.h"
+#include "texture_enum.h"
+
+#define HSV_WHEEL_SIZE 128
+
+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, float saturation)
+{
+       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 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;
+       }
+}
+