progs: add trivial ARB_half_float_vertex support.
This is just a trivial port of vp-array.c Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
215
progs/trivial/vp-array-hf.c
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215
progs/trivial/vp-array-hf.c
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/* Test glGenProgramsNV(), glIsProgramNV(), glLoadProgramNV() */
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#include <assert.h>
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#include <string.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/glew.h>
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#include <GL/glut.h>
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typedef union { GLfloat f; GLint i; } fi_type;
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/**
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* Convert a 4-byte float to a 2-byte half float.
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* Based on code from:
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* http://www.opengl.org/discussion_boards/ubb/Forum3/HTML/008786.html
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*/
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static GLhalf
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_mesa_float_to_half(GLfloat val)
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{
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const fi_type fi = {val};
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const int flt_m = fi.i & 0x7fffff;
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const int flt_e = (fi.i >> 23) & 0xff;
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const int flt_s = (fi.i >> 31) & 0x1;
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int s, e, m = 0;
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GLhalf result;
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/* sign bit */
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s = flt_s;
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/* handle special cases */
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if ((flt_e == 0) && (flt_m == 0)) {
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/* zero */
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/* m = 0; - already set */
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e = 0;
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}
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else if ((flt_e == 0) && (flt_m != 0)) {
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/* denorm -- denorm float maps to 0 half */
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/* m = 0; - already set */
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e = 0;
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}
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else if ((flt_e == 0xff) && (flt_m == 0)) {
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/* infinity */
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/* m = 0; - already set */
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e = 31;
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}
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else if ((flt_e == 0xff) && (flt_m != 0)) {
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/* NaN */
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m = 1;
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e = 31;
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}
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else {
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/* regular number */
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const int new_exp = flt_e - 127;
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if (new_exp < -24) {
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/* this maps to 0 */
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/* m = 0; - already set */
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e = 0;
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}
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else if (new_exp < -14) {
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/* this maps to a denorm */
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unsigned int exp_val = (unsigned int) (-14 - new_exp); /* 2^-exp_val*/
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e = 0;
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switch (exp_val) {
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case 0:
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/* m = 0; - already set */
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break;
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case 1: m = 512 + (flt_m >> 14); break;
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case 2: m = 256 + (flt_m >> 15); break;
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case 3: m = 128 + (flt_m >> 16); break;
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case 4: m = 64 + (flt_m >> 17); break;
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case 5: m = 32 + (flt_m >> 18); break;
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case 6: m = 16 + (flt_m >> 19); break;
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case 7: m = 8 + (flt_m >> 20); break;
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case 8: m = 4 + (flt_m >> 21); break;
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case 9: m = 2 + (flt_m >> 22); break;
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case 10: m = 1; break;
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}
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}
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else if (new_exp > 15) {
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/* map this value to infinity */
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/* m = 0; - already set */
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e = 31;
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}
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else {
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/* regular */
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e = new_exp + 15;
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m = flt_m >> 13;
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}
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}
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result = (s << 15) | (e << 10) | m;
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return result;
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}
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GLfloat verts[][4] = {
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{ 0.9, -0.9, 0.0, 1.0 },
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{ 0.9, 0.9, 0.0, 1.0 },
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{ -0.9, 0.9, 0.0, 1.0 },
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{ -0.9, -0.9, 0.0, 1.0 },
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};
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GLhalf hverts[16];
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GLubyte color[][4] = {
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{ 0x00, 0x00, 0xff, 0x00 },
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{ 0x00, 0xff, 0x00, 0x00 },
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{ 0xff, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0x00 },
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};
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GLuint indices[] = { 0, 1, 2, 3 };
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static void Init( void )
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{
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GLint errno;
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GLuint prognum;
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GLuint i, j;
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static const char *prog1 =
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"!!ARBvp1.0\n"
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"MOV result.color, vertex.color;\n"
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"MOV result.position, vertex.position;\n"
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"END\n";
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if (!glutExtensionSupported("GL_ARB_half_float_vertex")) {
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printf("GL_ARB_half_float_vertex not found!\n");
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exit(0);
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}
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glGenProgramsARB(1, &prognum);
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glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
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glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
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strlen(prog1), (const GLubyte *) prog1);
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assert(glIsProgramARB(prognum));
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errno = glGetError();
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printf("glGetError = %d\n", errno);
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if (errno != GL_NO_ERROR)
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{
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GLint errorpos;
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glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
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printf("errorpos: %d\n", errorpos);
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printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
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}
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for (i = 0; i < 4; i++)
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for (j = 0; j < 4; j++)
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hverts[i * 4 + j] = _mesa_float_to_half(verts[i][j]);
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glEnableClientState( GL_VERTEX_ARRAY );
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glEnableClientState( GL_COLOR_ARRAY );
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glVertexPointer( 4, GL_HALF_FLOAT, 8, hverts );
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glColorPointer( 4, GL_UNSIGNED_BYTE, 0, color );
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}
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static void Display( void )
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{
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glClearColor(0.3, 0.3, 0.3, 1);
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glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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glEnable(GL_VERTEX_PROGRAM_NV);
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glDrawElements( GL_TRIANGLES, 3, GL_UNSIGNED_INT, indices );
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glFlush();
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}
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static void 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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glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
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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 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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int 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( 250, 250 );
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glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
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glutCreateWindow(argv[0]);
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glewInit();
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutDisplayFunc( Display );
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Init();
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glutMainLoop();
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return 0;
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}
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