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-rw-r--r--progs/demos/isosurf.c224
1 files changed, 154 insertions, 70 deletions
diff --git a/progs/demos/isosurf.c b/progs/demos/isosurf.c
index 393197f66d..8ab73e917f 100644
--- a/progs/demos/isosurf.c
+++ b/progs/demos/isosurf.c
@@ -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
- * rotate, S toggles smooth shading, L toggles lighting
+ * Display an isosurface of 3-D wind speed volume.
+ *
* 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 $
- * Revision 1.1 1999/08/19 00:55:40 jtg
- * Initial revision
+ * Revision 1.2 1999/09/03 14:56:40 keithw
+ * Fog, displaylist and zoom operations
*
* Revision 3.4 1999/04/24 01:10:47 keithw
* clip planes, materials
@@ -44,11 +60,11 @@
#define NO_REFLECT 0x20
#define POINT_FILTER 0x40
#define LINEAR_FILTER 0x80
-#define IMMEDIATE 0x100
+#define GLVERTEX 0x100
#define DRAW_ARRAYS 0x200 /* or draw_elts, if compiled */
#define ARRAY_ELT 0x400
#define COMPILED 0x800
-#define NOT_COMPILED 0x1000
+#define IMMEDIATE 0x1000
#define SHADE_SMOOTH 0x2000
#define SHADE_FLAT 0x4000
#define TRIANGLES 0x8000
@@ -57,18 +73,22 @@
#define NO_USER_CLIP 0x40000
#define MATERIALS 0x80000
#define NO_MATERIALS 0x100000
+#define FOG 0x200000
+#define NO_FOG 0x400000
#define QUIT 0x800000
+#define DISPLAYLIST 0x1000000
#define LIGHT_MASK (LIT|UNLIT)
#define TEXTURE_MASK (TEXTURE|NO_TEXTURE)
#define REFLECT_MASK (REFLECT|NO_REFLECT)
#define FILTER_MASK (POINT_FILTER|LINEAR_FILTER)
-#define RENDER_STYLE_MASK (IMMEDIATE|DRAW_ARRAYS|ARRAY_ELT)
-#define COMPILED_MASK (COMPILED|NOT_COMPILED)
+#define RENDER_STYLE_MASK (GLVERTEX|DRAW_ARRAYS|ARRAY_ELT)
+#define COMPILED_MASK (COMPILED|IMMEDIATE|DISPLAYLIST)
#define MATERIAL_MASK (MATERIALS|NO_MATERIALS)
#define PRIMITIVE_MASK (TRIANGLES|STRIPS)
#define CLIP_MASK (USER_CLIP|NO_USER_CLIP)
#define SHADE_MASK (SHADE_SMOOTH|SHADE_FLAT)
+#define FOG_MASK (FOG|NO_FOG)
#define MAXVERTS 10000
static float data[MAXVERTS][6];
@@ -80,10 +100,11 @@ static GLint numverts, num_tri_verts, numuniq;
static GLfloat xrot;
static GLfloat yrot;
+static GLfloat dist = -6;
static GLint state, allowed = ~0;
static GLboolean doubleBuffer = GL_TRUE;
static GLdouble plane[4] = {1.0, 0.0, -1.0, 0.0};
-
+static GLuint surf1;
static void read_surface( char *filename )
{
@@ -290,11 +311,11 @@ static void make_tri_indices( void )
#define MIN(x,y) (x < y) ? x : y
-static void draw_surface( void )
+static void draw_surface( int with_state )
{
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
case (COMPILED|DRAW_ARRAYS|STRIPS):
@@ -310,8 +331,8 @@ static void draw_surface( void )
break;
case (COMPILED|DRAW_ARRAYS|TRIANGLES):
- case (NOT_COMPILED|DRAW_ARRAYS|TRIANGLES):
- if (state & MATERIALS) {
+ case (IMMEDIATE|DRAW_ARRAYS|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]);
@@ -327,22 +348,22 @@ static void draw_surface( void )
/* Uses the original arrays (including duplicate elements):
*/
- case (NOT_COMPILED|DRAW_ARRAYS|STRIPS):
+ case (IMMEDIATE|DRAW_ARRAYS|STRIPS):
glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts );
break;
/* Uses the original arrays (including duplicate elements):
*/
- case (NOT_COMPILED|ARRAY_ELT|STRIPS):
+ case (IMMEDIATE|ARRAY_ELT|STRIPS):
glBegin( GL_TRIANGLE_STRIP );
for (i = 0 ; i < numverts ; i++)
glArrayElement( i );
glEnd();
break;
- case (NOT_COMPILED|ARRAY_ELT|TRIANGLES):
+ case (IMMEDIATE|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++) {
GLuint nr = MIN(num_tri_verts-i, 600);
GLuint k;
@@ -357,12 +378,13 @@ static void draw_surface( void )
glBegin( GL_TRIANGLES );
for (i = 0 ; i < num_tri_verts ; i++)
glArrayElement( tri_indices[i] );
+
glEnd();
}
break;
- case (NOT_COMPILED|IMMEDIATE|TRIANGLES):
- if (state & MATERIALS) {
+ case (IMMEDIATE|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;
@@ -385,6 +407,13 @@ static void draw_surface( void )
}
break;
+ case (DISPLAYLIST|GLVERTEX|STRIPS):
+ if (!surf1)
+ surf1 = BuildList( GL_COMPILE_AND_EXECUTE );
+ else
+ glCallList(surf1);
+ break;
+
#endif
/* Uses the original arrays (including duplicate elements):
@@ -404,18 +433,27 @@ static void draw_surface( void )
static void Display(void)
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
- draw_surface();
+ draw_surface( state );
glFlush();
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.
*/
static void set_matrix( void )
{
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
- glTranslatef( 0.0, 0.0, -6.0 );
+ glTranslatef( 0.0, 0.0, dist );
glRotatef( yrot, 0.0, 1.0, 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
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 );
glNormalPointerEXT( GL_FLOAT, sizeof(data[0]), numverts, &data[0][3]);
@@ -588,6 +639,8 @@ static void ModeMenu(int m)
static void Init(void)
{
+ GLfloat fogColor[4] = {0.5,1.0,0.5,1.0};
+
glClearColor(0.0, 0.0, 0.0, 0.0);
glEnable( GL_DEPTH_TEST );
glEnable( GL_VERTEX_ARRAY_EXT );
@@ -616,20 +669,30 @@ static void Init(void)
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) {
compactify_arrays();
make_tri_indices();
}
+ surf1 = BuildList( GL_COMPILE );
+
ModeMenu(SHADE_SMOOTH|
LIT|
NO_TEXTURE|
NO_REFLECT|
POINT_FILTER|
- NOT_COMPILED|
+ IMMEDIATE|
NO_USER_CLIP|
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 )
{
switch (key) {
- case 27:
- exit(0);
- case 's':
- ModeMenu((state ^ SHADE_MASK) & SHADE_MASK);
- break;
- case 'l':
- ModeMenu((state ^ LIGHT_MASK) & LIGHT_MASK);
- break;
- case 'm':
- ModeMenu((state ^ MATERIAL_MASK) & MATERIAL_MASK);
- break;
- case 'c':
- ModeMenu((state ^ CLIP_MASK) & CLIP_MASK);
- break;
- case 'b':
- Benchmark(5.0, 0);
- break;
- case 'B':
- Benchmark(0, 5.0);
- 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 27:
+ exit(0);
+ case 'f':
+ ModeMenu((state ^ FOG_MASK) & FOG_MASK);
+ break;
+ case 's':
+ ModeMenu((state ^ SHADE_MASK) & SHADE_MASK);
+ break;
+ case 'l':
+ ModeMenu((state ^ LIGHT_MASK) & LIGHT_MASK);
+ break;
+ case 'm':
+ ModeMenu((state ^ MATERIAL_MASK) & MATERIAL_MASK);
+ break;
+ case 'c':
+ ModeMenu((state ^ CLIP_MASK) & CLIP_MASK);
+ 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;
}
}
@@ -782,21 +858,27 @@ int main(int argc, char **argv)
glutAddMenuEntry("Smooth", SHADE_SMOOTH);
glutAddMenuEntry("Flat", SHADE_FLAT);
glutAddMenuEntry("", 0);
+ glutAddMenuEntry("Fog", FOG);
+ glutAddMenuEntry("No Fog", NO_FOG);
+ glutAddMenuEntry("", 0);
glutAddMenuEntry("Point Filtered", POINT_FILTER);
glutAddMenuEntry("Linear Filtered", LINEAR_FILTER);
glutAddMenuEntry("", 0);
- glutAddMenuEntry("Immediate (STRIPS)", NOT_COMPILED|IMMEDIATE|STRIPS);
- glutAddMenuEntry("Immediate (TRIANGLES)", NOT_COMPILED|IMMEDIATE|TRIANGLES);
+ glutAddMenuEntry("glVertex (STRIPS)", IMMEDIATE|GLVERTEX|STRIPS);
+ glutAddMenuEntry("glVertex (TRIANGLES)", IMMEDIATE|GLVERTEX|TRIANGLES);
+ glutAddMenuEntry("", 0);
+ glutAddMenuEntry("glVertex display list (STRIPS)",
+ DISPLAYLIST|GLVERTEX|STRIPS);
glutAddMenuEntry("", 0);
if (allowed & DRAW_ARRAYS) {
glutAddMenuEntry("DrawArrays (STRIPS)",
- NOT_COMPILED|DRAW_ARRAYS|STRIPS);
+ IMMEDIATE|DRAW_ARRAYS|STRIPS);
glutAddMenuEntry("ArrayElement (STRIPS)",
- NOT_COMPILED|ARRAY_ELT|STRIPS);
+ IMMEDIATE|ARRAY_ELT|STRIPS);
glutAddMenuEntry("DrawElements (TRIANGLES)",
- NOT_COMPILED|DRAW_ARRAYS|TRIANGLES);
+ IMMEDIATE|DRAW_ARRAYS|TRIANGLES);
glutAddMenuEntry("ArrayElement (TRIANGLES)",
- NOT_COMPILED|ARRAY_ELT|TRIANGLES);
+ IMMEDIATE|ARRAY_ELT|TRIANGLES);
glutAddMenuEntry("", 0);
}
@@ -805,7 +887,9 @@ int main(int argc, char **argv)
COMPILED|DRAW_ARRAYS|TRIANGLES);
glutAddMenuEntry("Compiled DrawElements (STRIPS)",
COMPILED|DRAW_ARRAYS|STRIPS);
- glutAddMenuEntry("Compiled ArrayElement",
+ glutAddMenuEntry("Compiled ArrayElement (TRIANGLES)",
+ COMPILED|ARRAY_ELT|TRIANGLES);
+ glutAddMenuEntry("Compiled ArrayElement (STRIPS)",
COMPILED|ARRAY_ELT|STRIPS);
glutAddMenuEntry("", 0);
}
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