right click menu, now rotation is done using left click

README.md

@@ -6,6 +6,11 @@ Code here is published under the [AGPL-v3](https://www.gnu.org/licenses/agpl-3.0
 
 # TODO
 
+- Add menu - partially done
+    - Adjust ambient light
+    - help
+    - quit
+- Allow changing the move/rotation speed(or just a multiplier)
 - Create a cow
     - Head
     - Tail
@@ -21,10 +26,6 @@ Code here is published under the [AGPL-v3](https://www.gnu.org/licenses/agpl-3.0
     - Legs? (optional)
 - Change camera position to be cow point of view
     - Add popping-floating text of funny cow thoughts
-- Add menu
-    - Adjust ambient light
-    - help
-    - quit
 - Add multiple objects(that is not the cow)
 - User controlled light source
     - Add light source

help.h

@@ -0,0 +1,9 @@
+const unsigned char helpString[] = 
+"World of Cow by Aviv Romem\n"
+"Left/Middle mouse to control camera rotation/Position.\n"
+"Scroll wheel to control camera zoom.\n"
+"WASD keys to control the cow.\n"
+"Different parts of the cow can be controlled by select\n a different part in the right click menu(under 'Control Cow').\n"
+"Left click/scroll wheel on a slider to change its value.\n"
+"ESC to close this popup, ESC again to exit the program.\n"
+;

mmn_17.c

@@ -7,6 +7,7 @@
 #include <math.h>
 #include "ui.h"
 #include "grass_texture_color.h"
+#include "help.h"
 // close enough
 #define PI 3.14
 
@@ -17,10 +18,17 @@ vec3 camCenter = { 0.0, 0.0, 0.0 };
 vec3 camRot = { -PI * 0.125, 0.0, 0.0 };
 struct { 
     unsigned char lockYMovement: 1;
+    unsigned char showHelp: 1;
     GLenum textureFilter;
 } settings = {
-    0, GL_NEAREST, 
+    0, 0, GL_NEAREST, 
 };
+struct {
+    int main;
+    int cowControl;
+    int filters;
+} menus; // to simply hold the menues in a labed manner
+
 
 vec3 rotateByCameraRotation(vec3 v) {
     vec3 r;
@@ -38,23 +46,7 @@ vec3 rotateByCameraRotation(vec3 v) {
 int lastMouseButton = GLUT_LEFT_BUTTON;
 int lastMouseX = 0, lastMouseY = 0;
 ui_slider* draggedSlider = NULL;
-void changeFilterButton();
-void lockYButton();
-ui_button buttons[] = {
-    { 
-            /* pos */ { { 0.9, 0.5, 0.0 }, { -65.0, -20.0, 0.0 } },
-            /* size */ { 130.0, 40.0, 0.0 },
-            /* onclick */ changeFilterButton,
-            /* text */ "Cycle filter",
-            0
-        },
-        {
-            { { 0.9, 0.5, 0.0 }, { -50.0, 25.0, 0.0 } },
-            { 100.0, 40.0, 0.0 },
-            lockYButton,
-            "Lock Y"
-        }
-};
+ui_button buttons[] = {}; // TODO: maybe delete? the menu thing is easier to work with
 ui_slider sliders[] = {
     {
         /* pos */ { { 0.9, 0.7, 0.0 }, { -50.0, -5.0, 0.0 } },
@@ -63,18 +55,6 @@ ui_slider sliders[] = {
     }
 };
 
-void changeFilterButton() {
-    static int current = 0;
-    GLenum filters[] = { GL_NEAREST, GL_LINEAR };
-    current = (current + 1) % (sizeof(filters) / sizeof(GLenum));
-    settings.textureFilter = filters[current];
-    glutPostRedisplay();
-}
-void lockYButton() {
-    settings.lockYMovement ^= 1;
-    buttons[1].text = settings.lockYMovement ? "Unlock Y" : "Lock Y";
-}
-
 void drawUi(void) {
     glDisable(GL_LIGHTING);
     glDisable(GL_DEPTH_TEST);
@@ -96,6 +76,16 @@ void drawUi(void) {
         ui_slider_draw(s);
     }
     
+    if(settings.showHelp) {
+        glColor3f(0.3, 0.3, 0.3);
+        glBegin(GL_QUADS);
+            glVertex3f(wWidth * 0.1, wHeight * 0.1, 0.0);
+            glVertex3f(wWidth * 0.9, wHeight * 0.1, 0.0);
+            glVertex3f(wWidth * 0.9, wHeight * 0.9, 0.0);
+            glVertex3f(wWidth * 0.1, wHeight * 0.9, 0.0);
+        glEnd();
+    }
+    
     int err = glGetError();
     if(err != 0) {
         printf("opengl error %d: %s\n", err, gluErrorString(err));
@@ -199,6 +189,15 @@ void mouseMotionEvent(int x, int y) {
                 ui_slider_onclick(draggedSlider, x, y);
             }
         }
+        else {
+            // rotate the camera
+            camRot.y -= (x - lastMouseX) * PI * 0.01;
+            if(camRot.y > 2 * PI) camRot.y -= 2 * PI;
+            else if(camRot.y < 0.0) camRot.y += 2 * PI;
+            
+            camRot.x = fmin(PI * 0.5, fmax(-PI * 0.5, camRot.x - (y - lastMouseY) * 0.01 * PI));
+        }
+        
     }
     else if(lastMouseButton == GLUT_MIDDLE_BUTTON) {
         vec3 moveX = rotateByCameraRotation(vec3_new(1.0, 0.0, 0.0));
@@ -212,14 +211,6 @@ void mouseMotionEvent(int x, int y) {
         camCenter = vec3_add(camCenter, vec3_mult(moveX, (lastMouseX - x)));
         camCenter = vec3_add(camCenter, vec3_mult(moveY, (y - lastMouseY)));
     }
-    else if(lastMouseButton == GLUT_RIGHT_BUTTON) {
-        // rotate the camera
-        camRot.y -= (x - lastMouseX) * PI * 0.01;
-        if(camRot.y > 2 * PI) camRot.y -= 2 * PI;
-        else if(camRot.y < 0.0) camRot.y += 2 * PI;
-        
-        camRot.x = fmin(PI * 0.5, fmax(-PI * 0.5, camRot.x - (y - lastMouseY) * 0.01 * PI));
-    }
     lastMouseX = x; lastMouseY = y;
     glutPostRedisplay();
 }
@@ -242,14 +233,64 @@ void mouseWheelEvent(int wheel, int dir, int x, int y) {
 
 void keyboardEvent(unsigned char c, int x, int y) {
     if(c == '\e') {
-        glutLeaveMainLoop();
-        exit(0);
+        if(settings.showHelp) {
+            settings.showHelp = 0;
+            glutPostRedisplay();
+        }
+        else {
+            glutLeaveMainLoop();
+            exit(0);
+        }
     }
     if(c == 'a') {
         glutPostRedisplay();
     }
 }
 
+void onMenuItem(int item) {
+    lastMouseButton = -1; // to prevent jumps in view position/rotation
+    switch(item) {
+        case 0: // Lock y
+            settings.lockYMovement ^= 1;
+            glutChangeToMenuEntry(3, settings.lockYMovement ? "Unlock Y position" : "Lock Y position", 0);
+            break;
+        case 2: // Show help
+            settings.showHelp ^= 1;
+            glutPostRedisplay();
+            break;
+    }
+}
+
+void onControlCowMenu(int item) {
+    lastMouseButton = GLUT_RIGHT_BUTTON;
+    printf("Control cow: %d\n", item);
+}
+void onFilterMenu(int item) {
+    lastMouseButton = GLUT_RIGHT_BUTTON;
+    GLenum filters[] = { GL_LINEAR, GL_NEAREST };
+    settings.textureFilter = filters[item];
+}
+
+void menuSetup() {
+    // control cow sub-menu
+    menus.cowControl = glutCreateMenu(onControlCowMenu);
+    glutAddMenuEntry("Movement", 0);
+    glutAddMenuEntry("Head", 1);
+    glutAddMenuEntry("Tail", 2);
+    // filters
+    menus.filters = glutCreateMenu(onFilterMenu);
+    glutAddMenuEntry("Linear", 0);
+    glutAddMenuEntry("Nearest", 1);
+    
+    menus.main = glutCreateMenu(onMenuItem);
+    glutAddSubMenu("Control Cow", menus.cowControl);
+    glutAddSubMenu("Texture filters", menus.filters);
+    glutAddMenuEntry("Lock Y position", 0);
+    glutAddMenuEntry("Change to Cow POV", 1);
+    glutAddMenuEntry("Help", 2);
+    glutAttachMenu(GLUT_RIGHT_BUTTON);
+}
+
 int main(int argc, char** argv) {
     /* initialize glut and window */
     glutInit(&argc, argv);
@@ -263,6 +304,7 @@ int main(int argc, char** argv) {
     glutKeyboardFunc(keyboardEvent);
     glutMouseWheelFunc(mouseWheelEvent);
     glutMotionFunc(mouseMotionEvent);
+    menuSetup();
     // set up some rendering related stuff
     glEnable(GL_CULL_FACE);
     glCullFace(GL_BACK);