added floattex.c to test floating point textures

1 files changed, 169 insertions, 0 deletions

diff --git a/progs/tests/floattex.c b/progs/tests/floattex.c
new file mode 100644
index 00000000000..2345a49b270
--- /dev/null
+++ b/progs/tests/floattex.c
@@ -0,0 +1,169 @@
+/*
+ * Test floating point textures.
+ * No actual rendering, yet.
+ */
+
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+
+/* XXX - temporary */
+#ifndef GL_ARB_texture_float
+#define GL_ARB_texture_float 1
+#define GL_TEXTURE_RED_TYPE_ARB             0x9000
+#define GL_TEXTURE_GREEN_TYPE_ARB           0x9001
+#define GL_TEXTURE_BLUE_TYPE_ARB            0x9002
+#define GL_TEXTURE_ALPHA_TYPE_ARB           0x9003
+#define GL_TEXTURE_LUMINANCE_TYPE_ARB       0x9004
+#define GL_TEXTURE_INTENSITY_TYPE_ARB       0x9005
+#define GL_TEXTURE_DEPTH_TYPE_ARB           0x9006
+#define GL_UNSIGNED_NORMALIZED_ARB          0x9007
+#define GL_RGBA32F_ARB                      0x8814
+#define GL_RGB32F_ARB                       0x8815
+#define GL_ALPHA32F_ARB                     0x8816
+#define GL_INTENSITY32F_ARB                 0x8817
+#define GL_LUMINANCE32F_ARB                 0x8818
+#define GL_LUMINANCE_ALPHA32F_ARB           0x8819
+#define GL_RGBA16F_ARB                      0x881A
+#define GL_RGB16F_ARB                       0x881B
+#define GL_ALPHA16F_ARB                     0x881C
+#define GL_INTENSITY16F_ARB                 0x881D
+#define GL_LUMINANCE16F_ARB                 0x881E
+#define GL_LUMINANCE_ALPHA16F_ARB           0x881F
+#endif
+
+
+static GLboolean
+CheckError( int line )
+{
+   GLenum error = glGetError();
+   if (error) {
+      char *err = (char *) gluErrorString( error );
+      fprintf( stderr, "GL Error: %s at line %d\n", err, line );
+      return GL_TRUE;
+   }
+   return GL_FALSE;
+}
+
+
+static void
+Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   glPushMatrix();
+
+   glutSolidCube(2.0);
+
+   glPopMatrix();
+
+   glutSwapBuffers();
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   glViewport(0, 0, width, height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
+   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)
+{
+   GLfloat tex[16][16][4];
+   GLfloat tex2[16][16][4];
+   GLint i, j, t;
+
+   if (!glutExtensionSupported("GL_MESAX_texture_float")) {
+      printf("Sorry, this test requires GL_MESAX_texture_float\n");
+      exit(1);
+   }
+
+   for (i = 0; i < 16; i++) {
+      for (j = 0; j < 16; j++) {
+         GLfloat s = i / 15.0;
+         tex[i][j][0] = s;
+         tex[i][j][1] = 2.0 * s;
+         tex[i][j][2] = -3.0 * s;
+         tex[i][j][3] = 4.0 * s;
+      }
+   }
+
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F_ARB, 16, 16, 0, GL_RGBA,
+                GL_FLOAT, tex);
+   CheckError(__LINE__);
+
+   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_RED_TYPE_ARB, &t);
+   assert(t == GL_FLOAT);
+   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_TYPE_ARB, &t);
+   assert(t == GL_FLOAT);
+   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_TYPE_ARB, &t);
+   assert(t == GL_FLOAT);
+   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_TYPE_ARB, &t);
+   assert(t == GL_FLOAT);
+
+   CheckError(__LINE__);
+
+   /* read back the texture and make sure values are correct */
+   glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, tex2);
+   CheckError(__LINE__);
+   for (i = 0; i < 16; i++) {
+      for (j = 0; j < 16; j++) {
+         if (tex[i][j][0] != tex2[i][j][0] ||
+             tex[i][j][1] != tex2[i][j][1] ||
+             tex[i][j][2] != tex2[i][j][2] ||
+             tex[i][j][3] != tex2[i][j][3]) {
+            printf("tex[%d][%d] %g %g %g %g != tex2[%d][%d] %g %g %g %g\n",
+                   i, j,
+                   tex[i][j][0], tex[i][j][1], tex[i][j][2], tex[i][j][3],
+                   i, j,
+                   tex2[i][j][0], tex2[i][j][1], tex2[i][j][2], tex2[i][j][3]);
+         }
+      }
+   }
+
+
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   glutInit(&argc, argv);
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(400, 400);
+   glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
+   glutCreateWindow(argv[0]);
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutDisplayFunc(Draw);
+   Init();
+   glutMainLoop();
+   return 0;
+}