diff options
Diffstat (limited to 'progs/trivial')
| -rw-r--r-- | progs/trivial/Makefile | 1 | ||||
| -rw-r--r-- | progs/trivial/vp-array-hf.c | 215 |
2 files changed, 216 insertions, 0 deletions
diff --git a/progs/trivial/Makefile b/progs/trivial/Makefile index 5e08d60389..207215dee9 100644 --- a/progs/trivial/Makefile +++ b/progs/trivial/Makefile @@ -160,6 +160,7 @@ SOURCES = \ vbo-drawelements.c \ vbo-drawrange.c \ vp-array.c \ + vp-array-hf.c \ vp-array-int.c \ vp-clip.c \ vp-line-clip.c \ diff --git a/progs/trivial/vp-array-hf.c b/progs/trivial/vp-array-hf.c new file mode 100644 index 0000000000..f812436437 --- /dev/null +++ b/progs/trivial/vp-array-hf.c @@ -0,0 +1,215 @@ +/* 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; +} |