170 lines
4.2 KiB
C
170 lines
4.2 KiB
C
/*
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* Test floating point textures.
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* No actual rendering, yet.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <GL/glut.h>
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/* XXX - temporary */
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#ifndef GL_ARB_texture_float
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#define GL_ARB_texture_float 1
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#define GL_TEXTURE_RED_TYPE_ARB 0x9000
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#define GL_TEXTURE_GREEN_TYPE_ARB 0x9001
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#define GL_TEXTURE_BLUE_TYPE_ARB 0x9002
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#define GL_TEXTURE_ALPHA_TYPE_ARB 0x9003
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#define GL_TEXTURE_LUMINANCE_TYPE_ARB 0x9004
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#define GL_TEXTURE_INTENSITY_TYPE_ARB 0x9005
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#define GL_TEXTURE_DEPTH_TYPE_ARB 0x9006
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#define GL_UNSIGNED_NORMALIZED_ARB 0x9007
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#define GL_RGBA32F_ARB 0x8814
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#define GL_RGB32F_ARB 0x8815
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#define GL_ALPHA32F_ARB 0x8816
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#define GL_INTENSITY32F_ARB 0x8817
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#define GL_LUMINANCE32F_ARB 0x8818
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#define GL_LUMINANCE_ALPHA32F_ARB 0x8819
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#define GL_RGBA16F_ARB 0x881A
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#define GL_RGB16F_ARB 0x881B
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#define GL_ALPHA16F_ARB 0x881C
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#define GL_INTENSITY16F_ARB 0x881D
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#define GL_LUMINANCE16F_ARB 0x881E
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#define GL_LUMINANCE_ALPHA16F_ARB 0x881F
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#endif
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static GLboolean
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CheckError( int line )
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{
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GLenum error = glGetError();
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if (error) {
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char *err = (char *) gluErrorString( error );
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fprintf( stderr, "GL Error: %s at line %d\n", err, line );
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return GL_TRUE;
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}
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return GL_FALSE;
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}
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static void
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Draw(void)
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glPushMatrix();
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glutSolidCube(2.0);
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glPopMatrix();
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glutSwapBuffers();
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}
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static void
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Reshape(int width, int height)
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{
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glViewport(0, 0, width, height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -15.0);
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}
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static void
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Key(unsigned char key, int x, int y)
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{
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(void) x;
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(void) y;
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switch (key) {
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case 27:
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exit(0);
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break;
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}
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glutPostRedisplay();
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}
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static void
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Init(void)
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{
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GLfloat tex[16][16][4];
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GLfloat tex2[16][16][4];
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GLint i, j, t;
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if (!glutExtensionSupported("GL_MESAX_texture_float")) {
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printf("Sorry, this test requires GL_MESAX_texture_float\n");
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exit(1);
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}
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for (i = 0; i < 16; i++) {
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for (j = 0; j < 16; j++) {
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GLfloat s = i / 15.0;
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tex[i][j][0] = s;
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tex[i][j][1] = 2.0 * s;
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tex[i][j][2] = -3.0 * s;
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tex[i][j][3] = 4.0 * s;
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}
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}
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F_ARB, 16, 16, 0, GL_RGBA,
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GL_FLOAT, tex);
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CheckError(__LINE__);
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glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_RED_TYPE_ARB, &t);
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assert(t == GL_FLOAT);
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glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_TYPE_ARB, &t);
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assert(t == GL_FLOAT);
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glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_TYPE_ARB, &t);
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assert(t == GL_FLOAT);
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glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_TYPE_ARB, &t);
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assert(t == GL_FLOAT);
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CheckError(__LINE__);
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/* read back the texture and make sure values are correct */
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glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, tex2);
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CheckError(__LINE__);
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for (i = 0; i < 16; i++) {
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for (j = 0; j < 16; j++) {
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if (tex[i][j][0] != tex2[i][j][0] ||
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tex[i][j][1] != tex2[i][j][1] ||
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tex[i][j][2] != tex2[i][j][2] ||
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tex[i][j][3] != tex2[i][j][3]) {
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printf("tex[%d][%d] %g %g %g %g != tex2[%d][%d] %g %g %g %g\n",
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i, j,
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tex[i][j][0], tex[i][j][1], tex[i][j][2], tex[i][j][3],
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i, j,
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tex2[i][j][0], tex2[i][j][1], tex2[i][j][2], tex2[i][j][3]);
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}
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}
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}
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}
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int
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main(int argc, char *argv[])
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{
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glutInit(&argc, argv);
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glutInitWindowPosition(0, 0);
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glutInitWindowSize(400, 400);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
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glutCreateWindow(argv[0]);
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glutReshapeFunc(Reshape);
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glutKeyboardFunc(Key);
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glutDisplayFunc(Draw);
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Init();
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glutMainLoop();
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return 0;
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}
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