GL_EXT_secondary_color test

progs/tests/seccolor.c

@@ -0,0 +1,145 @@
+/*
+ * Exercise GL_EXT_secondary_color
+ */
+
+
+#define GL_GLEXT_PROTOTYPES
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+static int Width = 600;
+static int Height = 200;
+static GLfloat Near = 5.0, Far = 25.0;
+
+
+static void Display( void )
+{
+   GLfloat t;
+
+   glClearColor(0.2, 0.2, 0.8, 0);
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+   for (t = 0.0; t <= 1.0; t += 0.25) {
+      GLfloat x =  t * 10.0 - 5.0;
+      GLfloat g = t;
+
+      /* top row: untextured */
+      glColor3f(1, 0, 0);
+      glPushMatrix();
+         glTranslatef(x, 1.2, 0);
+#if defined(GL_EXT_secondary_color)
+         glSecondaryColor3fEXT(0, g, 0);
+#endif
+         glBegin(GL_POLYGON);
+         glVertex2f(-1, -1);
+         glVertex2f( 1, -1);
+         glVertex2f( 1,  1);
+         glVertex2f(-1,  1);
+         glEnd();
+      glPopMatrix();
+
+      /* bottom row: textured */
+      glColor3f(1, 1, 1);
+      glEnable(GL_TEXTURE_2D);
+      glPushMatrix();
+         glTranslatef(x, -1.2, 0);
+#if defined(GL_EXT_secondary_color)
+         glSecondaryColor3fEXT(0, g, 0);
+#endif
+         glBegin(GL_POLYGON);
+         glTexCoord2f(0, 0);  glVertex2f(-1, -1);
+         glTexCoord2f(1, 0);  glVertex2f( 1, -1);
+         glTexCoord2f(1, 1);  glVertex2f( 1,  1);
+         glTexCoord2f(0, 1);  glVertex2f(-1,  1);
+         glEnd();
+      glPopMatrix();
+      glDisable(GL_TEXTURE_2D);
+   }
+   glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+   GLfloat ar = (float) width / (float) height;
+   Width = width;
+   Height = height;
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -15.0 );
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void Init( void )
+{
+   GLubyte image[4*4][3];
+   GLint i;
+   if (!glutExtensionSupported("GL_EXT_secondary_color")) {
+      printf("Sorry, this program requires GL_EXT_secondary_color\n");
+      exit(1);
+   }
+
+   /* setup red texture with one back texel */
+   for (i = 0; i < 4*4; i++) {
+      if (i == 0) {
+         image[i][0] = 0;
+         image[i][1] = 0;
+         image[i][2] = 0;
+      }
+      else {
+         image[i][0] = 255;
+         image[i][1] = 0;
+         image[i][2] = 0;
+      }
+   }
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 4, 4, 0,
+                GL_RGB, GL_UNSIGNED_BYTE, image);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+#if defined(GL_EXT_secondary_color)
+   glEnable(GL_COLOR_SUM_EXT);
+#endif
+   glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
+
+   printf("Squares should be colored from red -> orange -> yellow.\n");
+   printf("Top row is untextured.\n");
+   printf("Bottom row is textured (red texture with one black texel).\n");
+   printf("Rows should be identical, except for lower-left texel.\n");
+}
+
+
+int main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize( Width, Height );
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+   glutCreateWindow(argv[0]);
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutDisplayFunc( Display );
+   Init();
+   glutMainLoop();
+   return 0;
+}