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xenocara/dist/Mesa/progs/demos/isosurf.c
matthieu 0d540fed81 Mesa 7.0.1
2007-11-24 17:25:28 +00:00

1127 lines
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/*
* Display an isosurface of 3-D wind speed volume.
*
* Command line options:
* -info print GL implementation information
*
* Brian Paul This file in public domain.
*/
/* Keys:
* =====
*
* - Arrow keys to rotate
* - 's' toggles smooth shading
* - 'l' toggles lighting
* - 'f' toggles fog
* - 'I' and 'i' zoom in and out
* - 'c' toggles a user clip plane
* - 'm' toggles colorful materials in GL_TRIANGLES modes.
* - '+' and '-' move the user clip plane
*
* Other options are available via the popup menu.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#ifdef _WIN32
#include <windows.h>
#undef CLIP_MASK
#endif
#define GL_GLEXT_PROTOTYPES
#include "GL/glut.h"
#include "readtex.h"
#define TEXTURE_FILE "../images/reflect.rgb"
#define LIT 0x00000001
#define UNLIT 0x00000002
#define REFLECT 0x00000004
#define POINT_FILTER 0x00000008
#define LINEAR_FILTER 0x00000010
#define GLVERTEX 0x00000020
#define DRAW_ELTS 0x00000040
#define DRAW_ARRAYS 0x00000080
#define ARRAY_ELT 0x00000100
#define LOCKED 0x00000200
#define UNLOCKED 0x00000400
#define IMMEDIATE 0x00000800
#define DISPLAYLIST 0x00001000
#define SHADE_SMOOTH 0x00002000
#define SHADE_FLAT 0x00004000
#define TRIANGLES 0x00008000
#define STRIPS 0x00010000
#define POINTS 0x00020000
#define USER_CLIP 0x00040000
#define NO_USER_CLIP 0x00080000
#define MATERIALS 0x00100000
#define NO_MATERIALS 0x00200000
#define FOG 0x00400000
#define NO_FOG 0x00800000
#define QUIT 0x01000000
#define GLINFO 0x02000000
#define STIPPLE 0x04000000
#define NO_STIPPLE 0x08000000
#define POLYGON_FILL 0x10000000
#define POLYGON_LINE 0x20000000
#define LIGHT_MASK (LIT|UNLIT|REFLECT)
#define FILTER_MASK (POINT_FILTER|LINEAR_FILTER)
#define RENDER_STYLE_MASK (GLVERTEX|DRAW_ARRAYS|DRAW_ELTS|ARRAY_ELT)
#define DLIST_MASK (IMMEDIATE|DISPLAYLIST)
#define LOCK_MASK (LOCKED|UNLOCKED)
#define MATERIAL_MASK (MATERIALS|NO_MATERIALS)
#define PRIMITIVE_MASK (TRIANGLES|STRIPS|POINTS)
#define CLIP_MASK (USER_CLIP|NO_USER_CLIP)
#define SHADE_MASK (SHADE_SMOOTH|SHADE_FLAT)
#define FOG_MASK (FOG|NO_FOG)
#define STIPPLE_MASK (STIPPLE|NO_STIPPLE)
#define POLYGON_MASK (POLYGON_FILL|POLYGON_LINE)
#define MAXVERTS 10000
static GLint maxverts = MAXVERTS;
static float data[MAXVERTS][6];
static float compressed_data[MAXVERTS][6];
static float expanded_data[MAXVERTS*3][6];
static GLuint indices[MAXVERTS];
static GLuint tri_indices[MAXVERTS*3];
static GLuint strip_indices[MAXVERTS];
static GLfloat col[100][4];
static GLint numverts, num_tri_verts, numuniq;
static GLfloat xrot;
static GLfloat yrot;
static GLfloat dist;
static GLint state, allowed = ~0;
static GLboolean doubleBuffer = GL_TRUE;
static GLdouble plane[4];
static GLuint surf1, dlist_state;
static GLboolean PrintInfo = GL_FALSE;
static GLubyte halftone[] = {
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55};
static void read_surface( char *filename )
{
FILE *f;
f = fopen(filename,"r");
if (!f) {
printf("couldn't read %s\n", filename);
exit(1);
}
numverts = 0;
while (!feof(f) && numverts<maxverts) {
fscanf( f, "%f %f %f %f %f %f",
&data[numverts][0], &data[numverts][1], &data[numverts][2],
&data[numverts][3], &data[numverts][4], &data[numverts][5] );
numverts++;
}
numverts--;
printf("%d vertices, %d triangles\n", numverts, numverts-2);
fclose(f);
}
static void print_flags( const char *msg, GLuint flags )
{
fprintf(stderr,
"%s (0x%x): %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
msg, flags,
(flags & GLVERTEX) ? "glVertex, " : "",
(flags & DRAW_ARRAYS) ? "glDrawArrays, " : "",
(flags & DRAW_ELTS) ? "glDrawElements, " : "",
(flags & ARRAY_ELT) ? "glArrayElement, " : "",
(flags & LOCKED) ? "locked arrays, " : "",
(flags & TRIANGLES) ? "GL_TRIANGLES, " : "",
(flags & STRIPS) ? "GL_TRIANGLE_STRIP, " : "",
(flags & POINTS) ? "GL_POINTS, " : "",
(flags & DISPLAYLIST) ? "as a displaylist, " : "",
(flags & LIT) ? "lit, " : "",
(flags & UNLIT) ? "unlit, " : "",
(flags & REFLECT) ? "reflect, " : "",
(flags & SHADE_FLAT) ? "flat-shaded, " : "",
(flags & USER_CLIP) ? "user_clip, " : "",
(flags & MATERIALS) ? "materials, " : "",
(flags & FOG) ? "fog, " : "",
(flags & STIPPLE) ? "stipple, " : "",
(flags & POLYGON_LINE) ? "polygon mode line, " : "");
}
struct data_idx {
float *data;
int idx;
int uniq_idx;
};
#define COMPARE_FUNC( AXIS ) \
static int compare_axis_##AXIS( const void *a, const void *b ) \
{ \
float t = ( (*(struct data_idx *)a).data[AXIS] - \
(*(struct data_idx *)b).data[AXIS] ); \
\
if (t < 0) return -1; \
if (t > 0) return 1; \
return 0; \
}
COMPARE_FUNC(0)
COMPARE_FUNC(1)
COMPARE_FUNC(2)
COMPARE_FUNC(3)
COMPARE_FUNC(4)
COMPARE_FUNC(5)
COMPARE_FUNC(6)
int (*(compare[7]))( const void *a, const void *b ) =
{
compare_axis_0,
compare_axis_1,
compare_axis_2,
compare_axis_3,
compare_axis_4,
compare_axis_5,
compare_axis_6,
};
#define VEC_ELT(f, s, i) (float *)(((char *)f) + s * i)
static int sort_axis( int axis,
int vec_size,
int vec_stride,
struct data_idx *indices,
int start,
int finish,
float *out,
int uniq,
const float fudge )
{
int i;
if (finish-start > 2)
{
qsort( indices+start, finish-start, sizeof(*indices), compare[axis] );
}
else if (indices[start].data[axis] > indices[start+1].data[axis])
{
struct data_idx tmp = indices[start];
indices[start] = indices[start+1];
indices[start+1] = tmp;
}
if (axis == vec_size-1) {
for (i = start ; i < finish ; ) {
float max = indices[i].data[axis] + fudge;
float *dest = VEC_ELT(out, vec_stride, uniq);
int j;
for (j = 0 ; j < vec_size ; j++)
dest[j] = indices[i].data[j];
for ( ; i < finish && max >= indices[i].data[axis]; i++)
indices[i].uniq_idx = uniq;
uniq++;
}
} else {
for (i = start ; i < finish ; ) {
int j = i + 1;
float max = indices[i].data[axis] + fudge;
while (j < finish && max >= indices[j].data[axis]) j++;
if (j == i+1) {
float *dest = VEC_ELT(out, vec_stride, uniq);
int k;
indices[i].uniq_idx = uniq;
for (k = 0 ; k < vec_size ; k++)
dest[k] = indices[i].data[k];
uniq++;
} else {
uniq = sort_axis( axis+1, vec_size, vec_stride,
indices, i, j, out, uniq, fudge );
}
i = j;
}
}
return uniq;
}
static void extract_indices1( const struct data_idx *in, unsigned int *out,
int n )
{
int i;
for ( i = 0 ; i < n ; i++ ) {
out[in[i].idx] = in[i].uniq_idx;
}
}
static void compactify_arrays(void)
{
int i;
struct data_idx *ind;
ind = (struct data_idx *) malloc( sizeof(struct data_idx) * numverts );
for (i = 0 ; i < numverts ; i++) {
ind[i].idx = i;
ind[i].data = data[i];
}
numuniq = sort_axis(0,
sizeof(compressed_data[0])/sizeof(float),
sizeof(compressed_data[0]),
ind,
0,
numverts,
(float *)compressed_data,
0,
1e-6);
printf("Nr unique vertex/normal pairs: %d\n", numuniq);
extract_indices1( ind, indices, numverts );
free( ind );
}
static void expand_arrays(void)
{
int i;
int parity = 0;
for (i = 2 ; i < numverts ; i++, parity ^= 1) {
int v0 = i-2+parity;
int v1 = i-1-parity;
int v2 = i;
memcpy( expanded_data[(i-2)*3+0], data[v0], sizeof(data[0]) );
memcpy( expanded_data[(i-2)*3+1], data[v1], sizeof(data[0]) );
memcpy( expanded_data[(i-2)*3+2], data[v2], sizeof(data[0]) );
}
}
static float myrand( float max )
{
return max*rand()/(RAND_MAX+1.0);
}
static void make_tri_indices( void )
{
unsigned int *v = tri_indices;
unsigned int parity = 0;
int i, j;
for (j=2;j<numverts;j++,parity^=1) {
if (parity) {
*v++ = indices[j-1];
*v++ = indices[j-2];
*v++ = indices[j];
} else {
*v++ = indices[j-2];
*v++ = indices[j-1];
*v++ = indices[j];
}
}
num_tri_verts = v - tri_indices;
printf("num_tri_verts: %d\n", num_tri_verts);
for (i = j = 0 ; i < num_tri_verts ; i += 600, j++) {
col[j][3] = 1;
col[j][2] = myrand(1);
col[j][1] = myrand(1);
col[j][0] = myrand(1);
}
for (i = 0; i < numverts ; i++)
strip_indices[i] = i;
}
#define MIN(x,y) (x < y) ? x : y
static void draw_surface( unsigned int with_state )
{
GLint i, j;
if (with_state & DISPLAYLIST) {
if ((with_state & (RENDER_STYLE_MASK|PRIMITIVE_MASK|MATERIAL_MASK)) !=
dlist_state) {
/*
*/
fprintf(stderr, "rebuilding displaylist\n");
if (dlist_state)
glDeleteLists( surf1, 1 );
dlist_state = with_state & (RENDER_STYLE_MASK|PRIMITIVE_MASK|
MATERIAL_MASK);
surf1 = glGenLists(1);
glNewList(surf1, GL_COMPILE);
draw_surface( dlist_state );
glEndList();
}
glCallList( surf1 );
return;
}
switch (with_state & (RENDER_STYLE_MASK|PRIMITIVE_MASK)) {
#ifdef GL_EXT_vertex_array
case (DRAW_ELTS|TRIANGLES):
if (with_state & MATERIALS) {
for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) {
GLuint nr = MIN(num_tri_verts-i, 600);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, col[j]);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, col[j]);
glDrawElements( GL_TRIANGLES, nr, GL_UNSIGNED_INT, tri_indices+i );
}
} else {
glDrawElements( GL_TRIANGLES, num_tri_verts, GL_UNSIGNED_INT,
tri_indices );
}
break;
case (DRAW_ARRAYS|TRIANGLES):
glDrawArraysEXT( GL_TRIANGLES, 0, (numverts-2)*3 );
break;
case (ARRAY_ELT|TRIANGLES):
if (with_state & MATERIALS) {
for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) {
GLuint nr = MIN(num_tri_verts-i, 600);
GLuint k;
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, col[j]);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, col[j]);
glBegin( GL_TRIANGLES );
for (k = 0 ; k < nr ; k++)
glArrayElement( tri_indices[i+k] );
glEnd();
}
} else {
glBegin( GL_TRIANGLES );
for (i = 0 ; i < num_tri_verts ; i++)
glArrayElement( tri_indices[i] );
glEnd();
}
break;
/* Uses the original arrays (including duplicate elements):
*/
case (DRAW_ARRAYS|STRIPS):
glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts );
break;
case (DRAW_ELTS|STRIPS):
glDrawElements( GL_TRIANGLE_STRIP, numverts,
GL_UNSIGNED_INT, strip_indices );
break;
/* Uses the original arrays (including duplicate elements):
*/
case (ARRAY_ELT|STRIPS):
glBegin( GL_TRIANGLE_STRIP );
for (i = 0 ; i < numverts ; i++)
glArrayElement( i );
glEnd();
break;
case (DRAW_ARRAYS|POINTS):
glDrawArraysEXT( GL_POINTS, 0, numuniq );
break;
case (DRAW_ELTS|POINTS):
/* can use numuniq with strip_indices as strip_indices[i] == i.
*/
glDrawElements( GL_POINTS, numuniq,
GL_UNSIGNED_INT, strip_indices );
break;
case (ARRAY_ELT|POINTS):
/* just emit each unique element once:
*/
glBegin( GL_POINTS );
for (i = 0 ; i < numuniq ; i++)
glArrayElement( i );
glEnd();
break;
#endif
case (GLVERTEX|TRIANGLES):
if (with_state & MATERIALS) {
for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) {
GLuint nr = MIN(num_tri_verts-i, 600);
GLuint k;
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, col[j]);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, col[j]);
glBegin( GL_TRIANGLES );
for (k = 0 ; k < nr ; k++) {
glNormal3fv( &compressed_data[tri_indices[i+k]][3] );
glVertex3fv( &compressed_data[tri_indices[i+k]][0] );
}
glEnd();
}
} else {
glBegin( GL_TRIANGLES );
for (i = 0 ; i < num_tri_verts ; i++) {
glNormal3fv( &compressed_data[tri_indices[i]][3] );
glVertex3fv( &compressed_data[tri_indices[i]][0] );
}
glEnd();
}
break;
case (GLVERTEX|POINTS):
/* Renders all points, but not in strip order... Shouldn't be a
* problem, but people may be confused as to why points are so
* much faster in this demo... And why cva doesn't help them...
*/
glBegin( GL_POINTS );
for ( i = 0 ; i < numuniq ; i++ ) {
glNormal3fv( &compressed_data[i][3] );
glVertex3fv( &compressed_data[i][0] );
}
glEnd();
break;
case (GLVERTEX|STRIPS):
glBegin( GL_TRIANGLE_STRIP );
for (i=0;i<numverts;i++) {
glNormal3fv( &data[i][3] );
glVertex3fv( &data[i][0] );
}
glEnd();
break;
default:
fprintf(stderr, "unimplemented mode %x...\n",
(with_state & (RENDER_STYLE_MASK|PRIMITIVE_MASK)));
break;
}
}
static void Display(void)
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
draw_surface( state );
glFlush();
if (doubleBuffer) glutSwapBuffers();
}
/* KW: only do this when necessary, so CVA can re-use results.
*/
static void set_matrix( void )
{
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef( 0.0, 0.0, dist );
glRotatef( yrot, 0.0, 1.0, 0.0 );
glRotatef( xrot, 1.0, 0.0, 0.0 );
}
static void Benchmark( float xdiff, float ydiff )
{
int startTime, endTime;
int draws;
double seconds, fps, triPerSecond;
printf("Benchmarking...\n");
draws = 0;
startTime = glutGet(GLUT_ELAPSED_TIME);
xrot = 0.0;
do {
xrot += xdiff;
yrot += ydiff;
set_matrix();
Display();
draws++;
endTime = glutGet(GLUT_ELAPSED_TIME);
} while (endTime - startTime < 5000); /* 5 seconds */
/* Results */
seconds = (double) (endTime - startTime) / 1000.0;
triPerSecond = (numverts - 2) * draws / seconds;
fps = draws / seconds;
printf("Result: triangles/sec: %g fps: %g\n", triPerSecond, fps);
}
static void InitMaterials(void)
{
static float ambient[] = {0.1, 0.1, 0.1, 1.0};
static float diffuse[] = {0.5, 1.0, 1.0, 1.0};
static float position0[] = {0.0, 0.0, 20.0, 0.0};
static float position1[] = {0.0, 0.0, -20.0, 0.0};
static float front_mat_shininess[] = {60.0};
static float front_mat_specular[] = {0.2, 0.2, 0.2, 1.0};
static float front_mat_diffuse[] = {0.5, 0.28, 0.38, 1.0};
/*
static float back_mat_shininess[] = {60.0};
static float back_mat_specular[] = {0.5, 0.5, 0.2, 1.0};
static float back_mat_diffuse[] = {1.0, 1.0, 0.2, 1.0};
*/
static float lmodel_ambient[] = {1.0, 1.0, 1.0, 1.0};
static float lmodel_twoside[] = {GL_FALSE};
glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
glLightfv(GL_LIGHT0, GL_POSITION, position0);
glEnable(GL_LIGHT0);
glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
glLightfv(GL_LIGHT1, GL_POSITION, position1);
glEnable(GL_LIGHT1);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_mat_shininess);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_mat_specular);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, front_mat_diffuse);
glPolygonStipple (halftone);
}
#define UPDATE(o,n,mask) (o&=~mask, o|=n&mask)
#define CHANGED(o,n,mask) ((n&mask) && (n&mask) != (o&mask) )
static void ModeMenu(int m)
{
m &= allowed;
if (!m) return;
if (m==QUIT)
exit(0);
if (m==GLINFO) {
printf("GL_VERSION: %s\n", (char *) glGetString(GL_VERSION));
printf("GL_EXTENSIONS: %s\n", (char *) glGetString(GL_EXTENSIONS));
printf("GL_RENDERER: %s\n", (char *) glGetString(GL_RENDERER));
return;
}
if (CHANGED(state, m, FILTER_MASK)) {
UPDATE(state, m, FILTER_MASK);
if (m & LINEAR_FILTER) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
} else {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
}
if (CHANGED(state, m, LIGHT_MASK)) {
UPDATE(state, m, LIGHT_MASK);
if (m & LIT) {
glEnable(GL_LIGHTING);
glDisable(GL_TEXTURE_GEN_S);
glDisable(GL_TEXTURE_GEN_T);
glDisable(GL_TEXTURE_2D);
}
else if (m & UNLIT) {
glDisable(GL_LIGHTING);
glDisable(GL_TEXTURE_GEN_S);
glDisable(GL_TEXTURE_GEN_T);
glDisable(GL_TEXTURE_2D);
}
else if (m & REFLECT) {
glDisable(GL_LIGHTING);
glEnable(GL_TEXTURE_GEN_S);
glEnable(GL_TEXTURE_GEN_T);
glEnable(GL_TEXTURE_2D);
}
}
if (CHANGED(state, m, SHADE_MASK)) {
UPDATE(state, m, SHADE_MASK);
if (m & SHADE_SMOOTH)
glShadeModel(GL_SMOOTH);
else
glShadeModel(GL_FLAT);
}
if (CHANGED(state, m, CLIP_MASK)) {
UPDATE(state, m, CLIP_MASK);
if (m & USER_CLIP) {
glEnable(GL_CLIP_PLANE0);
} else {
glDisable(GL_CLIP_PLANE0);
}
}
if (CHANGED(state, m, FOG_MASK)) {
UPDATE(state, m, FOG_MASK);
if (m & FOG) {
glEnable(GL_FOG);
}
else {
glDisable(GL_FOG);
}
}
if (CHANGED(state, m, STIPPLE_MASK)) {
UPDATE(state, m, STIPPLE_MASK);
if (m & STIPPLE) {
glEnable(GL_POLYGON_STIPPLE);
}
else {
glDisable(GL_POLYGON_STIPPLE);
}
}
if (CHANGED(state, m, POLYGON_MASK)) {
UPDATE(state, m, POLYGON_MASK);
if (m & POLYGON_FILL) {
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
else {
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
}
}
#ifdef GL_EXT_vertex_array
if (CHANGED(state, m, (LOCK_MASK|RENDER_STYLE_MASK|PRIMITIVE_MASK)))
{
if (m & (PRIMITIVE_MASK)) {
UPDATE(state, m, (PRIMITIVE_MASK));
}
if (m & (RENDER_STYLE_MASK)) {
UPDATE(state, m, (RENDER_STYLE_MASK));
}
if (m & LOCK_MASK) {
UPDATE(state, m, (LOCK_MASK));
}
print_flags("primitive", state & PRIMITIVE_MASK);
print_flags("render style", state & RENDER_STYLE_MASK);
if ((state & PRIMITIVE_MASK) != STRIPS &&
((state & RENDER_STYLE_MASK) == DRAW_ELTS ||
(state & RENDER_STYLE_MASK) == ARRAY_ELT ||
(state & PRIMITIVE_MASK) == POINTS))
{
fprintf(stderr, "enabling small arrays\n");
/* Rendering any primitive with draw-element/array-element
* --> Can't do strips here as ordering has been lost in
* compaction process...
*/
glVertexPointerEXT( 3, GL_FLOAT, sizeof(data[0]), numuniq,
compressed_data );
glNormalPointerEXT( GL_FLOAT, sizeof(data[0]), numuniq,
&compressed_data[0][3]);
#ifdef GL_EXT_compiled_vertex_array
if (allowed & LOCKED) {
if (state & LOCKED) {
glLockArraysEXT( 0, numuniq );
} else {
glUnlockArraysEXT();
}
}
#endif
}
else if ((state & PRIMITIVE_MASK) == TRIANGLES &&
(state & RENDER_STYLE_MASK) == DRAW_ARRAYS) {
fprintf(stderr, "enabling big arrays\n");
/* Only get here for TRIANGLES and drawarrays
*/
glVertexPointerEXT( 3, GL_FLOAT, sizeof(data[0]), (numverts-2) * 3,
expanded_data );
glNormalPointerEXT( GL_FLOAT, sizeof(data[0]), (numverts-2) * 3,
&expanded_data[0][3]);
#ifdef GL_EXT_compiled_vertex_array
if (allowed & LOCKED) {
if (state & LOCKED) {
glLockArraysEXT( 0, (numverts-2)*3 );
} else {
glUnlockArraysEXT();
}
}
#endif
}
else {
fprintf(stderr, "enabling normal arrays\n");
glVertexPointerEXT( 3, GL_FLOAT, sizeof(data[0]), numverts, data );
glNormalPointerEXT( GL_FLOAT, sizeof(data[0]), numverts, &data[0][3]);
#ifdef GL_EXT_compiled_vertex_array
if (allowed & LOCKED) {
if (state & LOCKED) {
glLockArraysEXT( 0, numverts );
} else {
glUnlockArraysEXT();
}
}
#endif
}
}
#endif
if (m & DLIST_MASK) {
UPDATE(state, m, DLIST_MASK);
}
if (m & MATERIAL_MASK) {
UPDATE(state, m, MATERIAL_MASK);
}
print_flags("new flags", state);
glutPostRedisplay();
}
static void Init(int argc, char *argv[])
{
GLfloat fogColor[4] = {0.5,1.0,0.5,1.0};
xrot = 0;
yrot = 0;
dist = -6;
plane[0] = 1.0;
plane[1] = 0.0;
plane[2] = -1.0;
plane[3] = 0.0;
glClearColor(0.0, 0.0, 1.0, 0.0);
glEnable( GL_DEPTH_TEST );
glEnable( GL_VERTEX_ARRAY_EXT );
glEnable( GL_NORMAL_ARRAY_EXT );
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 5, 25 );
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClipPlane(GL_CLIP_PLANE0, plane);
InitMaterials();
set_matrix();
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
/* Green fog is easy to see */
glFogi(GL_FOG_MODE,GL_EXP2);
glFogfv(GL_FOG_COLOR,fogColor);
glFogf(GL_FOG_DENSITY,0.15);
glHint(GL_FOG_HINT,GL_DONT_CARE);
{
static int firsttime = 1;
if (firsttime) {
firsttime = 0;
compactify_arrays();
expand_arrays();
make_tri_indices();
if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
printf("Error: couldn't load texture image\n");
exit(1);
}
}
}
ModeMenu(SHADE_SMOOTH|
LIT|
POINT_FILTER|
NO_USER_CLIP|
NO_MATERIALS|
NO_FOG|
NO_STIPPLE|
IMMEDIATE|
STRIPS|
UNLOCKED|
GLVERTEX);
if (PrintInfo) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
}
}
static void Reshape(int width, int height)
{
glViewport(0, 0, (GLint)width, (GLint)height);
}
static void Key( unsigned char key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case 27:
exit(0);
case 'f':
ModeMenu((state ^ FOG_MASK) & FOG_MASK);
break;
case 's':
ModeMenu((state ^ SHADE_MASK) & SHADE_MASK);
break;
case 't':
ModeMenu((state ^ STIPPLE_MASK) & STIPPLE_MASK);
break;
case 'l':
ModeMenu((state ^ LIGHT_MASK) & (LIT|UNLIT));
break;
case 'm':
ModeMenu((state ^ MATERIAL_MASK) & MATERIAL_MASK);
break;
case 'c':
ModeMenu((state ^ CLIP_MASK) & CLIP_MASK);
break;
case 'v':
ModeMenu((LOCKED|IMMEDIATE|DRAW_ELTS|TRIANGLES) & allowed);
break;
case 'V':
ModeMenu(UNLOCKED|IMMEDIATE|GLVERTEX|STRIPS);
break;
case 'b':
Benchmark(5.0, 0);
break;
case 'B':
Benchmark(0, 5.0);
break;
case 'i':
dist += .25;
set_matrix();
glutPostRedisplay();
break;
case 'I':
dist -= .25;
set_matrix();
glutPostRedisplay();
break;
case '-':
case '_':
plane[3] += 2.0;
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClipPlane(GL_CLIP_PLANE0, plane);
set_matrix();
glutPostRedisplay();
break;
case '+':
case '=':
plane[3] -= 2.0;
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClipPlane(GL_CLIP_PLANE0, plane);
set_matrix();
glutPostRedisplay();
break;
case ' ':
Init(0,0);
break;
}
}
static void SpecialKey( int key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case GLUT_KEY_LEFT:
yrot -= 15.0;
break;
case GLUT_KEY_RIGHT:
yrot += 15.0;
break;
case GLUT_KEY_UP:
xrot += 15.0;
break;
case GLUT_KEY_DOWN:
xrot -= 15.0;
break;
default:
return;
}
set_matrix();
glutPostRedisplay();
}
static GLint Args(int argc, char **argv)
{
GLint i;
GLint mode = 0;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-sb") == 0) {
doubleBuffer = GL_FALSE;
}
else if (strcmp(argv[i], "-db") == 0) {
doubleBuffer = GL_TRUE;
}
else if (strcmp(argv[i], "-info") == 0) {
PrintInfo = GL_TRUE;
}
else if (strcmp(argv[i], "-10") == 0) {
maxverts = 10;
}
else if (strcmp(argv[i], "-100") == 0) {
maxverts = 100;
}
else if (strcmp(argv[i], "-1000") == 0) {
maxverts = 1000;
}
else {
printf("%s (Bad option).\n", argv[i]);
return QUIT;
}
}
return mode;
}
int main(int argc, char **argv)
{
GLenum type;
char *extensions;
GLuint arg_mode = Args(argc, argv);
if (arg_mode & QUIT)
exit(0);
read_surface( "isosurf.dat" );
glutInit( &argc, argv);
glutInitWindowPosition(0, 0);
glutInitWindowSize(400, 400);
type = GLUT_DEPTH;
type |= GLUT_RGB;
type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
glutInitDisplayMode(type);
if (glutCreateWindow("Isosurface") <= 0) {
exit(0);
}
/* Make sure server supports the vertex array extension */
extensions = (char *) glGetString( GL_EXTENSIONS );
if (!strstr( extensions, "GL_EXT_vertex_array" ))
{
printf("Vertex arrays not supported by this renderer\n");
allowed &= ~(LOCKED|DRAW_ARRAYS|DRAW_ELTS|ARRAY_ELT);
}
else if (!strstr( extensions, "GL_EXT_compiled_vertex_array" ))
{
printf("Compiled vertex arrays not supported by this renderer\n");
allowed &= ~LOCKED;
}
Init(argc, argv);
ModeMenu(arg_mode);
glutCreateMenu(ModeMenu);
glutAddMenuEntry("GL info", GLINFO);
glutAddMenuEntry("", 0);
glutAddMenuEntry("Lit", LIT);
glutAddMenuEntry("Unlit", UNLIT);
glutAddMenuEntry("Reflect", REFLECT);
glutAddMenuEntry("", 0);
glutAddMenuEntry("Smooth", SHADE_SMOOTH);
glutAddMenuEntry("Flat", SHADE_FLAT);
glutAddMenuEntry("", 0);
glutAddMenuEntry("Fog", FOG);
glutAddMenuEntry("No Fog", NO_FOG);
glutAddMenuEntry("", 0);
glutAddMenuEntry("Stipple", STIPPLE);
glutAddMenuEntry("No Stipple", NO_STIPPLE);
glutAddMenuEntry("", 0);
glutAddMenuEntry("Polygon Mode Fill", POLYGON_FILL);
glutAddMenuEntry("Polygon Mode Line", POLYGON_LINE);
glutAddMenuEntry("", 0);
glutAddMenuEntry("Point Filtered", POINT_FILTER);
glutAddMenuEntry("Linear Filtered", LINEAR_FILTER);
glutAddMenuEntry("", 0);
glutAddMenuEntry("GL_TRIANGLES", TRIANGLES);
glutAddMenuEntry("GL_TRIANGLE_STRIPS", STRIPS);
glutAddMenuEntry("GL_POINTS", POINTS);
glutAddMenuEntry("", 0);
glutAddMenuEntry("Displaylist", DISPLAYLIST);
glutAddMenuEntry("Immediate", IMMEDIATE);
glutAddMenuEntry("", 0);
if (allowed & LOCKED) {
glutAddMenuEntry("Locked Arrays (CVA)", LOCKED);
glutAddMenuEntry("Unlocked Arrays", UNLOCKED);
glutAddMenuEntry("", 0);
}
glutAddMenuEntry("glVertex", GLVERTEX);
if (allowed & DRAW_ARRAYS) {
glutAddMenuEntry("glDrawElements", DRAW_ELTS);
glutAddMenuEntry("glDrawArrays", DRAW_ARRAYS);
glutAddMenuEntry("glArrayElement", ARRAY_ELT);
}
glutAddMenuEntry("", 0);
glutAddMenuEntry("Quit", QUIT);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutSpecialFunc(SpecialKey);
glutDisplayFunc(Display);
glutMainLoop();
return 0;
}
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