+++ /dev/null
-/* Test glGenProgramsNV(), glIsProgramNV(), glLoadProgramNV() */
-
-#include <assert.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-
-typedef union { GLfloat f; GLint i; } fi_type;
-/**
- * Convert a 4-byte float to a 2-byte half float.
- * Based on code from:
- * http://www.opengl.org/discussion_boards/ubb/Forum3/HTML/008786.html
- */
-static GLhalf
-_mesa_float_to_half(GLfloat val)
-{
-
- const fi_type fi = {val};
- const int flt_m = fi.i & 0x7fffff;
- const int flt_e = (fi.i >> 23) & 0xff;
- const int flt_s = (fi.i >> 31) & 0x1;
- int s, e, m = 0;
- GLhalf result;
-
- /* sign bit */
- s = flt_s;
-
- /* handle special cases */
- if ((flt_e == 0) && (flt_m == 0)) {
- /* zero */
- /* m = 0; - already set */
- e = 0;
- }
- else if ((flt_e == 0) && (flt_m != 0)) {
- /* denorm -- denorm float maps to 0 half */
- /* m = 0; - already set */
- e = 0;
- }
- else if ((flt_e == 0xff) && (flt_m == 0)) {
- /* infinity */
- /* m = 0; - already set */
- e = 31;
- }
- else if ((flt_e == 0xff) && (flt_m != 0)) {
- /* NaN */
- m = 1;
- e = 31;
- }
- else {
- /* regular number */
- const int new_exp = flt_e - 127;
- if (new_exp < -24) {
- /* this maps to 0 */
- /* m = 0; - already set */
- e = 0;
- }
- else if (new_exp < -14) {
- /* this maps to a denorm */
- unsigned int exp_val = (unsigned int) (-14 - new_exp); /* 2^-exp_val*/
- e = 0;
- switch (exp_val) {
- case 0:
- /* m = 0; - already set */
- break;
- case 1: m = 512 + (flt_m >> 14); break;
- case 2: m = 256 + (flt_m >> 15); break;
- case 3: m = 128 + (flt_m >> 16); break;
- case 4: m = 64 + (flt_m >> 17); break;
- case 5: m = 32 + (flt_m >> 18); break;
- case 6: m = 16 + (flt_m >> 19); break;
- case 7: m = 8 + (flt_m >> 20); break;
- case 8: m = 4 + (flt_m >> 21); break;
- case 9: m = 2 + (flt_m >> 22); break;
- case 10: m = 1; break;
- }
- }
- else if (new_exp > 15) {
- /* map this value to infinity */
- /* m = 0; - already set */
- e = 31;
- }
- else {
- /* regular */
- e = new_exp + 15;
- m = flt_m >> 13;
- }
- }
-
- result = (s << 15) | (e << 10) | m;
- return result;
-}
-
-
-GLfloat verts[][4] = {
- { 0.9, -0.9, 0.0, 1.0 },
- { 0.9, 0.9, 0.0, 1.0 },
- { -0.9, 0.9, 0.0, 1.0 },
- { -0.9, -0.9, 0.0, 1.0 },
-};
-
-GLhalf hverts[16];
-
-GLubyte color[][4] = {
- { 0x00, 0x00, 0xff, 0x00 },
- { 0x00, 0xff, 0x00, 0x00 },
- { 0xff, 0x00, 0x00, 0x00 },
- { 0xff, 0xff, 0xff, 0x00 },
-};
-
-GLuint indices[] = { 0, 1, 2, 3 };
-
-static void Init( void )
-{
- GLint errno;
- GLuint prognum;
- GLuint i, j;
-
- static const char *prog1 =
- "!!ARBvp1.0\n"
- "MOV result.color, vertex.color;\n"
- "MOV result.position, vertex.position;\n"
- "END\n";
-
- if (!glutExtensionSupported("GL_ARB_half_float_vertex")) {
- printf("GL_ARB_half_float_vertex not found!\n");
- exit(0);
- }
-
- glGenProgramsARB(1, &prognum);
- glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
- glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
- strlen(prog1), (const GLubyte *) prog1);
-
- assert(glIsProgramARB(prognum));
- errno = glGetError();
- printf("glGetError = %d\n", errno);
- if (errno != GL_NO_ERROR)
- {
- GLint errorpos;
-
- glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
- printf("errorpos: %d\n", errorpos);
- printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
- }
-
- for (i = 0; i < 4; i++)
- for (j = 0; j < 4; j++)
- hverts[i * 4 + j] = _mesa_float_to_half(verts[i][j]);
-
- glEnableClientState( GL_VERTEX_ARRAY );
- glEnableClientState( GL_COLOR_ARRAY );
- glVertexPointer( 4, GL_HALF_FLOAT, 8, hverts );
- glColorPointer( 4, GL_UNSIGNED_BYTE, 0, color );
-
-}
-
-
-
-static void Display( void )
-{
- glClearColor(0.3, 0.3, 0.3, 1);
- glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
-
- glEnable(GL_VERTEX_PROGRAM_NV);
- glDrawElements( GL_TRIANGLES, 3, GL_UNSIGNED_INT, indices );
-
- glFlush();
-}
-
-
-static void Reshape( int width, int height )
-{
- glViewport( 0, 0, width, height );
- glMatrixMode( GL_PROJECTION );
- glLoadIdentity();
- glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
- 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();
-}
-
-
-
-
-int main( int argc, char *argv[] )
-{
- glutInit( &argc, argv );
- glutInitWindowPosition( 0, 0 );
- glutInitWindowSize( 250, 250 );
- glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
- glutCreateWindow(argv[0]);
- glewInit();
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutDisplayFunc( Display );
- Init();
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff