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Fog, displaylist and zoom operations

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This commit is contained in:
Keith Whitwell
1999-09-03 14:56:40 +00:00
parent 8d8e248ab2
commit 44c73933e9
1 changed files with 154 additions and 70 deletions
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224
progs/demos/isosurf.c
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@@ -1,15 +1,31 @@
/* $Id: isosurf.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */ /* $Id: isosurf.c,v 1.2 1999/09/03 14:56:40 keithw Exp $ */
/* /*
* Display an isosurface of 3-D wind speed volume. Use arrow keys to * Display an isosurface of 3-D wind speed volume.
* rotate, S toggles smooth shading, L toggles lighting *
* Brian Paul This file in public domain. * 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.
*/
/* /*
* $Log: isosurf.c,v $ * $Log: isosurf.c,v $
* Revision 1.1 1999/08/19 00:55:40 jtg * Revision 1.2 1999/09/03 14:56:40 keithw
* Initial revision * Fog, displaylist and zoom operations
* *
* Revision 3.4 1999/04/24 01:10:47 keithw * Revision 3.4 1999/04/24 01:10:47 keithw
* clip planes, materials * clip planes, materials
@@ -44,11 +60,11 @@
#define NO_REFLECT 0x20 #define NO_REFLECT 0x20
#define POINT_FILTER 0x40 #define POINT_FILTER 0x40
#define LINEAR_FILTER 0x80 #define LINEAR_FILTER 0x80
#define IMMEDIATE 0x100 #define GLVERTEX 0x100
#define DRAW_ARRAYS 0x200 /* or draw_elts, if compiled */ #define DRAW_ARRAYS 0x200 /* or draw_elts, if compiled */
#define ARRAY_ELT 0x400 #define ARRAY_ELT 0x400
#define COMPILED 0x800 #define COMPILED 0x800
#define NOT_COMPILED 0x1000 #define IMMEDIATE 0x1000
#define SHADE_SMOOTH 0x2000 #define SHADE_SMOOTH 0x2000
#define SHADE_FLAT 0x4000 #define SHADE_FLAT 0x4000
#define TRIANGLES 0x8000 #define TRIANGLES 0x8000
@@ -57,18 +73,22 @@
#define NO_USER_CLIP 0x40000 #define NO_USER_CLIP 0x40000
#define MATERIALS 0x80000 #define MATERIALS 0x80000
#define NO_MATERIALS 0x100000 #define NO_MATERIALS 0x100000
#define FOG 0x200000
#define NO_FOG 0x400000
#define QUIT 0x800000 #define QUIT 0x800000
#define DISPLAYLIST 0x1000000
#define LIGHT_MASK (LIT|UNLIT) #define LIGHT_MASK (LIT|UNLIT)
#define TEXTURE_MASK (TEXTURE|NO_TEXTURE) #define TEXTURE_MASK (TEXTURE|NO_TEXTURE)
#define REFLECT_MASK (REFLECT|NO_REFLECT) #define REFLECT_MASK (REFLECT|NO_REFLECT)
#define FILTER_MASK (POINT_FILTER|LINEAR_FILTER) #define FILTER_MASK (POINT_FILTER|LINEAR_FILTER)
#define RENDER_STYLE_MASK (IMMEDIATE|DRAW_ARRAYS|ARRAY_ELT) #define RENDER_STYLE_MASK (GLVERTEX|DRAW_ARRAYS|ARRAY_ELT)
#define COMPILED_MASK (COMPILED|NOT_COMPILED) #define COMPILED_MASK (COMPILED|IMMEDIATE|DISPLAYLIST)
#define MATERIAL_MASK (MATERIALS|NO_MATERIALS) #define MATERIAL_MASK (MATERIALS|NO_MATERIALS)
#define PRIMITIVE_MASK (TRIANGLES|STRIPS) #define PRIMITIVE_MASK (TRIANGLES|STRIPS)
#define CLIP_MASK (USER_CLIP|NO_USER_CLIP) #define CLIP_MASK (USER_CLIP|NO_USER_CLIP)
#define SHADE_MASK (SHADE_SMOOTH|SHADE_FLAT) #define SHADE_MASK (SHADE_SMOOTH|SHADE_FLAT)
#define FOG_MASK (FOG|NO_FOG)
#define MAXVERTS 10000 #define MAXVERTS 10000
static float data[MAXVERTS][6]; static float data[MAXVERTS][6];
@@ -80,10 +100,11 @@ static GLint numverts, num_tri_verts, numuniq;
static GLfloat xrot; static GLfloat xrot;
static GLfloat yrot; static GLfloat yrot;
static GLfloat dist = -6;
static GLint state, allowed = ~0; static GLint state, allowed = ~0;
static GLboolean doubleBuffer = GL_TRUE; static GLboolean doubleBuffer = GL_TRUE;
static GLdouble plane[4] = {1.0, 0.0, -1.0, 0.0}; static GLdouble plane[4] = {1.0, 0.0, -1.0, 0.0};
static GLuint surf1;
static void read_surface( char *filename ) static void read_surface( char *filename )
{ {
@@ -290,11 +311,11 @@ static void make_tri_indices( void )
#define MIN(x,y) (x < y) ? x : y #define MIN(x,y) (x < y) ? x : y
static void draw_surface( void ) static void draw_surface( int with_state )
{ {
GLuint i, j; GLuint i, j;
switch (state & (COMPILED_MASK|RENDER_STYLE_MASK|PRIMITIVE_MASK)) { switch (with_state & (COMPILED_MASK|RENDER_STYLE_MASK|PRIMITIVE_MASK)) {
#ifdef GL_EXT_vertex_array #ifdef GL_EXT_vertex_array
case (COMPILED|DRAW_ARRAYS|STRIPS): case (COMPILED|DRAW_ARRAYS|STRIPS):
@@ -310,8 +331,8 @@ static void draw_surface( void )
break; break;
case (COMPILED|DRAW_ARRAYS|TRIANGLES): case (COMPILED|DRAW_ARRAYS|TRIANGLES):
case (NOT_COMPILED|DRAW_ARRAYS|TRIANGLES): case (IMMEDIATE|DRAW_ARRAYS|TRIANGLES):
if (state & MATERIALS) { if (with_state & MATERIALS) {
for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) { for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) {
GLuint nr = MIN(num_tri_verts-i, 600); GLuint nr = MIN(num_tri_verts-i, 600);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, col[j]); glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, col[j]);
@@ -327,22 +348,22 @@ static void draw_surface( void )
/* Uses the original arrays (including duplicate elements): /* Uses the original arrays (including duplicate elements):
*/ */
case (NOT_COMPILED|DRAW_ARRAYS|STRIPS): case (IMMEDIATE|DRAW_ARRAYS|STRIPS):
glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts ); glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts );
break; break;
/* Uses the original arrays (including duplicate elements): /* Uses the original arrays (including duplicate elements):
*/ */
case (NOT_COMPILED|ARRAY_ELT|STRIPS): case (IMMEDIATE|ARRAY_ELT|STRIPS):
glBegin( GL_TRIANGLE_STRIP ); glBegin( GL_TRIANGLE_STRIP );
for (i = 0 ; i < numverts ; i++) for (i = 0 ; i < numverts ; i++)
glArrayElement( i ); glArrayElement( i );
glEnd(); glEnd();
break; break;
case (NOT_COMPILED|ARRAY_ELT|TRIANGLES): case (IMMEDIATE|ARRAY_ELT|TRIANGLES):
case (COMPILED|ARRAY_ELT|TRIANGLES): case (COMPILED|ARRAY_ELT|TRIANGLES):
if (state & MATERIALS) { if (with_state & MATERIALS) {
for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) { for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) {
GLuint nr = MIN(num_tri_verts-i, 600); GLuint nr = MIN(num_tri_verts-i, 600);
GLuint k; GLuint k;
@@ -357,12 +378,13 @@ static void draw_surface( void )
glBegin( GL_TRIANGLES ); glBegin( GL_TRIANGLES );
for (i = 0 ; i < num_tri_verts ; i++) for (i = 0 ; i < num_tri_verts ; i++)
glArrayElement( tri_indices[i] ); glArrayElement( tri_indices[i] );
glEnd(); glEnd();
} }
break; break;
case (NOT_COMPILED|IMMEDIATE|TRIANGLES): case (IMMEDIATE|GLVERTEX|TRIANGLES):
if (state & MATERIALS) { if (with_state & MATERIALS) {
for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) { for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) {
GLuint nr = MIN(num_tri_verts-i, 600); GLuint nr = MIN(num_tri_verts-i, 600);
GLuint k; GLuint k;
@@ -385,6 +407,13 @@ static void draw_surface( void )
} }
break; break;
case (DISPLAYLIST|GLVERTEX|STRIPS):
if (!surf1)
surf1 = BuildList( GL_COMPILE_AND_EXECUTE );
else
glCallList(surf1);
break;
#endif #endif
/* Uses the original arrays (including duplicate elements): /* Uses the original arrays (including duplicate elements):
@@ -404,18 +433,27 @@ static void draw_surface( void )
static void Display(void) static void Display(void)
{ {
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
draw_surface(); draw_surface( state );
glFlush(); glFlush();
if (doubleBuffer) glutSwapBuffers(); if (doubleBuffer) glutSwapBuffers();
} }
int BuildList( int mode )
{
int rv = glGenLists(1);
glNewList(rv, mode );
draw_surface( IMMEDIATE|GLVERTEX|STRIPS );
glEndList();
return rv;
}
/* KW: only do this when necessary, so CVA can re-use results. /* KW: only do this when necessary, so CVA can re-use results.
*/ */
static void set_matrix( void ) static void set_matrix( void )
{ {
glMatrixMode(GL_MODELVIEW); glMatrixMode(GL_MODELVIEW);
glLoadIdentity(); glLoadIdentity();
glTranslatef( 0.0, 0.0, -6.0 ); glTranslatef( 0.0, 0.0, dist );
glRotatef( yrot, 0.0, 1.0, 0.0 ); glRotatef( yrot, 0.0, 1.0, 0.0 );
glRotatef( xrot, 1.0, 0.0, 0.0 ); glRotatef( xrot, 1.0, 0.0, 0.0 );
} }
@@ -548,10 +586,23 @@ static void ModeMenu(int m)
} }
} }
if (CHANGED(state, m, FOG_MASK)) {
if (m & FOG)
{
glEnable(GL_FOG);
printf("FOG enable\n");
}
else
{
glDisable(GL_FOG);
printf("FOG disable\n");
}
}
#ifdef GL_EXT_vertex_array #ifdef GL_EXT_vertex_array
if (CHANGED(state, m, (COMPILED_MASK|RENDER_STYLE_MASK|PRIMITIVE_MASK))) if (CHANGED(state, m, (COMPILED_MASK|RENDER_STYLE_MASK|PRIMITIVE_MASK)))
{ {
if ((m & (COMPILED_MASK|PRIMITIVE_MASK)) == (NOT_COMPILED|STRIPS)) if ((m & (COMPILED_MASK|PRIMITIVE_MASK)) == (IMMEDIATE|STRIPS))
{ {
glVertexPointerEXT( 3, GL_FLOAT, sizeof(data[0]), numverts, data ); glVertexPointerEXT( 3, GL_FLOAT, sizeof(data[0]), numverts, data );
glNormalPointerEXT( GL_FLOAT, sizeof(data[0]), numverts, &data[0][3]); glNormalPointerEXT( GL_FLOAT, sizeof(data[0]), numverts, &data[0][3]);
@@ -588,6 +639,8 @@ static void ModeMenu(int m)
static void Init(void) static void Init(void)
{ {
GLfloat fogColor[4] = {0.5,1.0,0.5,1.0};
glClearColor(0.0, 0.0, 0.0, 0.0); glClearColor(0.0, 0.0, 0.0, 0.0);
glEnable( GL_DEPTH_TEST ); glEnable( GL_DEPTH_TEST );
glEnable( GL_VERTEX_ARRAY_EXT ); glEnable( GL_VERTEX_ARRAY_EXT );
@@ -616,20 +669,30 @@ static void Init(void)
exit(1); exit(1);
} }
/* 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);
if (allowed & COMPILED) { if (allowed & COMPILED) {
compactify_arrays(); compactify_arrays();
make_tri_indices(); make_tri_indices();
} }
surf1 = BuildList( GL_COMPILE );
ModeMenu(SHADE_SMOOTH| ModeMenu(SHADE_SMOOTH|
LIT| LIT|
NO_TEXTURE| NO_TEXTURE|
NO_REFLECT| NO_REFLECT|
POINT_FILTER| POINT_FILTER|
NOT_COMPILED| IMMEDIATE|
NO_USER_CLIP| NO_USER_CLIP|
NO_MATERIALS| NO_MATERIALS|
IMMEDIATE); NO_FOG|
GLVERTEX);
} }
@@ -644,44 +707,57 @@ static void Reshape(int width, int height)
static void Key( unsigned char key, int x, int y ) static void Key( unsigned char key, int x, int y )
{ {
switch (key) { switch (key) {
case 27: case 27:
exit(0); exit(0);
case 's': case 'f':
ModeMenu((state ^ SHADE_MASK) & SHADE_MASK); ModeMenu((state ^ FOG_MASK) & FOG_MASK);
break; break;
case 'l': case 's':
ModeMenu((state ^ LIGHT_MASK) & LIGHT_MASK); ModeMenu((state ^ SHADE_MASK) & SHADE_MASK);
break; break;
case 'm': case 'l':
ModeMenu((state ^ MATERIAL_MASK) & MATERIAL_MASK); ModeMenu((state ^ LIGHT_MASK) & LIGHT_MASK);
break; break;
case 'c': case 'm':
ModeMenu((state ^ CLIP_MASK) & CLIP_MASK); ModeMenu((state ^ MATERIAL_MASK) & MATERIAL_MASK);
break; break;
case 'b': case 'c':
Benchmark(5.0, 0); ModeMenu((state ^ CLIP_MASK) & CLIP_MASK);
break; break;
case 'B': case 'b':
Benchmark(0, 5.0); Benchmark(5.0, 0);
break; break;
case '-': case 'B':
case '_': Benchmark(0, 5.0);
plane[3] += 2.0; break;
glMatrixMode(GL_MODELVIEW); case 'i':
glLoadIdentity(); dist += .25;
glClipPlane(GL_CLIP_PLANE0, plane); set_matrix();
set_matrix(); glutPostRedisplay();
glutPostRedisplay(); break;
break; case 'I':
case '+': dist -= .25;
case '=': set_matrix();
plane[3] -= 2.0; glutPostRedisplay();
glMatrixMode(GL_MODELVIEW); break;
glLoadIdentity(); case '-':
glClipPlane(GL_CLIP_PLANE0, plane); case '_':
set_matrix(); plane[3] += 2.0;
glutPostRedisplay(); glMatrixMode(GL_MODELVIEW);
break; 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;
} }
} }
@@ -782,21 +858,27 @@ int main(int argc, char **argv)
glutAddMenuEntry("Smooth", SHADE_SMOOTH); glutAddMenuEntry("Smooth", SHADE_SMOOTH);
glutAddMenuEntry("Flat", SHADE_FLAT); glutAddMenuEntry("Flat", SHADE_FLAT);
glutAddMenuEntry("", 0); glutAddMenuEntry("", 0);
glutAddMenuEntry("Fog", FOG);
glutAddMenuEntry("No Fog", NO_FOG);
glutAddMenuEntry("", 0);
glutAddMenuEntry("Point Filtered", POINT_FILTER); glutAddMenuEntry("Point Filtered", POINT_FILTER);
glutAddMenuEntry("Linear Filtered", LINEAR_FILTER); glutAddMenuEntry("Linear Filtered", LINEAR_FILTER);
glutAddMenuEntry("", 0); glutAddMenuEntry("", 0);
glutAddMenuEntry("Immediate (STRIPS)", NOT_COMPILED|IMMEDIATE|STRIPS); glutAddMenuEntry("glVertex (STRIPS)", IMMEDIATE|GLVERTEX|STRIPS);
glutAddMenuEntry("Immediate (TRIANGLES)", NOT_COMPILED|IMMEDIATE|TRIANGLES); glutAddMenuEntry("glVertex (TRIANGLES)", IMMEDIATE|GLVERTEX|TRIANGLES);
glutAddMenuEntry("", 0);
glutAddMenuEntry("glVertex display list (STRIPS)",
DISPLAYLIST|GLVERTEX|STRIPS);
glutAddMenuEntry("", 0); glutAddMenuEntry("", 0);
if (allowed & DRAW_ARRAYS) { if (allowed & DRAW_ARRAYS) {
glutAddMenuEntry("DrawArrays (STRIPS)", glutAddMenuEntry("DrawArrays (STRIPS)",
NOT_COMPILED|DRAW_ARRAYS|STRIPS); IMMEDIATE|DRAW_ARRAYS|STRIPS);
glutAddMenuEntry("ArrayElement (STRIPS)", glutAddMenuEntry("ArrayElement (STRIPS)",
NOT_COMPILED|ARRAY_ELT|STRIPS); IMMEDIATE|ARRAY_ELT|STRIPS);
glutAddMenuEntry("DrawElements (TRIANGLES)", glutAddMenuEntry("DrawElements (TRIANGLES)",
NOT_COMPILED|DRAW_ARRAYS|TRIANGLES); IMMEDIATE|DRAW_ARRAYS|TRIANGLES);
glutAddMenuEntry("ArrayElement (TRIANGLES)", glutAddMenuEntry("ArrayElement (TRIANGLES)",
NOT_COMPILED|ARRAY_ELT|TRIANGLES); IMMEDIATE|ARRAY_ELT|TRIANGLES);
glutAddMenuEntry("", 0); glutAddMenuEntry("", 0);
} }
@@ -805,7 +887,9 @@ int main(int argc, char **argv)
COMPILED|DRAW_ARRAYS|TRIANGLES); COMPILED|DRAW_ARRAYS|TRIANGLES);
glutAddMenuEntry("Compiled DrawElements (STRIPS)", glutAddMenuEntry("Compiled DrawElements (STRIPS)",
COMPILED|DRAW_ARRAYS|STRIPS); COMPILED|DRAW_ARRAYS|STRIPS);
glutAddMenuEntry("Compiled ArrayElement", glutAddMenuEntry("Compiled ArrayElement (TRIANGLES)",
COMPILED|ARRAY_ELT|TRIANGLES);
glutAddMenuEntry("Compiled ArrayElement (STRIPS)",
COMPILED|ARRAY_ELT|STRIPS); COMPILED|ARRAY_ELT|STRIPS);
glutAddMenuEntry("", 0); glutAddMenuEntry("", 0);
} }