tests/clip: a simple interactive clipping test

3 files changed, 201 insertions, 0 deletions

diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
index d2c69039..53aac259 100644
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -41,6 +41,7 @@ set (targets
 	bug_texstore_i8
 	bumpmap
 	calibrate_rast
+	clip
 	condrender
 	copypixrate
 	cva
diff --git a/src/tests/Makefile.am b/src/tests/Makefile.am
index 632f4068..c8a575a7 100644
--- a/src/tests/Makefile.am
+++ b/src/tests/Makefile.am
@@ -74,6 +74,7 @@ noinst_PROGRAMS = \
 	bug_3195 \
 	bug_texstore_i8 \
 	calibrate_rast \
+	clip \
 	condrender \
 	copypixrate \
 	cva \
diff --git a/src/tests/clip.c b/src/tests/clip.c
new file mode 100644
index 00000000..2e9104ea
--- /dev/null
+++ b/src/tests/clip.c
@@ -0,0 +1,199 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "glut_wrap.h"
+
+static int Win;
+static int WinWidth = 400, WinHeight = 400;
+static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
+static GLboolean Anim = GL_FALSE;
+
+static int CurVert = 0, MoveAll = 0;
+static GLfloat Verts[3][2];
+
+
+static void
+Idle(void)
+{
+   Xrot += 3.0;
+   Yrot += 4.0;
+   Zrot += 2.0;
+   glutPostRedisplay();
+}
+
+
+static void
+Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   glBegin(GL_POLYGON);
+   glVertex2fv(Verts[0]);
+   glVertex2fv(Verts[1]);
+   glVertex2fv(Verts[2]);
+   glEnd();
+
+   glutSwapBuffers();
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   WinWidth = width;
+   WinHeight = height;
+   glViewport(0, 0, width, height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+}
+
+
+static void
+RotVerts(void)
+{
+   float tx = Verts[0][0], ty = Verts[0][1];
+   Verts[0][0] = Verts[1][0];   Verts[0][1] = Verts[1][1];
+   Verts[1][0] = Verts[2][0];   Verts[1][1] = Verts[2][1];
+   Verts[2][0] = tx;            Verts[2][1] = ty;
+}
+
+static void
+Save(void)
+{
+   int i;
+   FILE *f = fopen("verts.txt", "w");
+   for (i = 0; i < 3; i++)
+      fprintf(f, "%f %f\n", Verts[i][0], Verts[i][1]);
+   fclose(f);
+   printf("Saved data\n");
+}
+
+static void
+Restore(void)
+{
+   int i;
+   FILE *f = fopen("verts.txt", "r");
+   if (f) {
+      printf("Restoring data\n");
+      for (i = 0; i < 3; i++) {
+         int n =fscanf(f, "%f %f\n", &Verts[i][0], &Verts[i][1]);
+         (void) n;
+      }
+      fclose(f);
+   }
+}
+
+static void
+Key(unsigned char key, int x, int y)
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+   case 'r':
+      RotVerts();
+      break;
+   case 'a':
+      MoveAll = 1;
+      break;
+   case '0':
+      MoveAll = 0;
+      CurVert = 0;
+      break;
+   case '1':
+      MoveAll = 0;
+      CurVert = 1;
+      break;
+   case '2':
+      MoveAll = 0;
+      CurVert = 2;
+      break;
+   case 's':
+      Save();
+      break;
+   case 27:
+      glutDestroyWindow(Win);
+      exit(0);
+      break;
+   }
+   glutPostRedisplay();
+}
+
+static void
+move(float dx, float dy)
+{
+   int i;
+
+   dx *= 0.05;
+   dy *= 0.05;
+   if (MoveAll) {
+      for (i = 0; i < 3; i++) {
+         Verts[i][0] += dx;
+         Verts[i][1] += dy;
+      }
+   }
+   else {
+      Verts[CurVert][0] += dx;
+      Verts[CurVert][1] += dy;
+   }
+
+   printf("\n");
+   for (i = 0; i < 3; i++) {
+      printf("%f %f\n", Verts[i][0], Verts[i][1]);
+   }
+}
+
+
+static void
+SpecialKey(int key, int x, int y)
+{
+   switch (key) {
+   case GLUT_KEY_UP:
+      move(0, +1);
+      break;
+   case GLUT_KEY_DOWN:
+      move(0, -1);
+      break;
+   case GLUT_KEY_LEFT:
+      move(-1, 0);
+      break;
+   case GLUT_KEY_RIGHT:
+      move(1, 0);
+      break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+Init(void)
+{
+   Verts[0][0] = 0.0; Verts[0][1] = 0.0;
+   Verts[1][0] = 1.2; Verts[1][1] = -0.5;
+   Verts[2][0] = 0.6; Verts[2][1] = -1.5;
+
+   Restore();
+
+   glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   glutInit(&argc, argv);
+   glutInitWindowSize(WinWidth, WinHeight);
+   glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
+   Win = glutCreateWindow(argv[0]);
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutSpecialFunc(SpecialKey);
+   glutDisplayFunc(Draw);
+   if (Anim)
+      glutIdleFunc(Idle);
+   Init();
+   glutMainLoop();
+   return 0;
+}