Fog, displaylist and zoom operations
This commit is contained in:
Keith Whitwell
parent
8d8e248ab2
commit
44c73933e9
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@ -1,15 +1,31 @@
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/* $Id: isosurf.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */
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/* $Id: isosurf.c,v 1.2 1999/09/03 14:56:40 keithw Exp $ */
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/*
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* Display an isosurface of 3-D wind speed volume. Use arrow keys to
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* rotate, S toggles smooth shading, L toggles lighting
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* Display an isosurface of 3-D wind speed volume.
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*
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* Brian Paul This file in public domain.
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*/
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/* Keys:
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* =====
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*
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* - Arrow keys to rotate
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* - 's' toggles smooth shading
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* - 'l' toggles lighting
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* - 'f' toggles fog
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* - 'I' and 'i' zoom in and out
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* - 'c' toggles a user clip plane
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* - 'm' toggles colorful materials in GL_TRIANGLES modes.
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* - '+' and '-' move the user clip plane
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*
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* Other options are available via the popup menu.
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*/
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/*
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* $Log: isosurf.c,v $
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* Revision 1.1 1999/08/19 00:55:40 jtg
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* Initial revision
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* Revision 1.2 1999/09/03 14:56:40 keithw
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* Fog, displaylist and zoom operations
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*
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* Revision 3.4 1999/04/24 01:10:47 keithw
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* clip planes, materials
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@ -44,11 +60,11 @@
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#define NO_REFLECT 0x20
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#define POINT_FILTER 0x40
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#define LINEAR_FILTER 0x80
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#define IMMEDIATE 0x100
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#define GLVERTEX 0x100
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#define DRAW_ARRAYS 0x200 /* or draw_elts, if compiled */
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#define ARRAY_ELT 0x400
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#define COMPILED 0x800
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#define NOT_COMPILED 0x1000
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#define IMMEDIATE 0x1000
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#define SHADE_SMOOTH 0x2000
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#define SHADE_FLAT 0x4000
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#define TRIANGLES 0x8000
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@ -57,18 +73,22 @@
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#define NO_USER_CLIP 0x40000
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#define MATERIALS 0x80000
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#define NO_MATERIALS 0x100000
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#define FOG 0x200000
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#define NO_FOG 0x400000
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#define QUIT 0x800000
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#define DISPLAYLIST 0x1000000
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#define LIGHT_MASK (LIT|UNLIT)
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#define TEXTURE_MASK (TEXTURE|NO_TEXTURE)
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#define REFLECT_MASK (REFLECT|NO_REFLECT)
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#define FILTER_MASK (POINT_FILTER|LINEAR_FILTER)
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#define RENDER_STYLE_MASK (IMMEDIATE|DRAW_ARRAYS|ARRAY_ELT)
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#define COMPILED_MASK (COMPILED|NOT_COMPILED)
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#define RENDER_STYLE_MASK (GLVERTEX|DRAW_ARRAYS|ARRAY_ELT)
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#define COMPILED_MASK (COMPILED|IMMEDIATE|DISPLAYLIST)
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#define MATERIAL_MASK (MATERIALS|NO_MATERIALS)
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#define PRIMITIVE_MASK (TRIANGLES|STRIPS)
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#define CLIP_MASK (USER_CLIP|NO_USER_CLIP)
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#define SHADE_MASK (SHADE_SMOOTH|SHADE_FLAT)
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#define FOG_MASK (FOG|NO_FOG)
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#define MAXVERTS 10000
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static float data[MAXVERTS][6];
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@ -80,10 +100,11 @@ static GLint numverts, num_tri_verts, numuniq;
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static GLfloat xrot;
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static GLfloat yrot;
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static GLfloat dist = -6;
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static GLint state, allowed = ~0;
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static GLboolean doubleBuffer = GL_TRUE;
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static GLdouble plane[4] = {1.0, 0.0, -1.0, 0.0};
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static GLuint surf1;
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static void read_surface( char *filename )
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{
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@ -290,11 +311,11 @@ static void make_tri_indices( void )
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#define MIN(x,y) (x < y) ? x : y
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static void draw_surface( void )
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static void draw_surface( int with_state )
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{
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GLuint i, j;
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switch (state & (COMPILED_MASK|RENDER_STYLE_MASK|PRIMITIVE_MASK)) {
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switch (with_state & (COMPILED_MASK|RENDER_STYLE_MASK|PRIMITIVE_MASK)) {
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#ifdef GL_EXT_vertex_array
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case (COMPILED|DRAW_ARRAYS|STRIPS):
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@ -310,8 +331,8 @@ static void draw_surface( void )
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break;
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case (COMPILED|DRAW_ARRAYS|TRIANGLES):
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case (NOT_COMPILED|DRAW_ARRAYS|TRIANGLES):
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if (state & MATERIALS) {
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case (IMMEDIATE|DRAW_ARRAYS|TRIANGLES):
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if (with_state & MATERIALS) {
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for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) {
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GLuint nr = MIN(num_tri_verts-i, 600);
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glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, col[j]);
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@ -327,22 +348,22 @@ static void draw_surface( void )
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/* Uses the original arrays (including duplicate elements):
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*/
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case (NOT_COMPILED|DRAW_ARRAYS|STRIPS):
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case (IMMEDIATE|DRAW_ARRAYS|STRIPS):
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glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts );
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break;
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/* Uses the original arrays (including duplicate elements):
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*/
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case (NOT_COMPILED|ARRAY_ELT|STRIPS):
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case (IMMEDIATE|ARRAY_ELT|STRIPS):
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glBegin( GL_TRIANGLE_STRIP );
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for (i = 0 ; i < numverts ; i++)
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glArrayElement( i );
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glEnd();
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break;
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case (NOT_COMPILED|ARRAY_ELT|TRIANGLES):
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case (IMMEDIATE|ARRAY_ELT|TRIANGLES):
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case (COMPILED|ARRAY_ELT|TRIANGLES):
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if (state & MATERIALS) {
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if (with_state & MATERIALS) {
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for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) {
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GLuint nr = MIN(num_tri_verts-i, 600);
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GLuint k;
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@ -357,12 +378,13 @@ static void draw_surface( void )
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glBegin( GL_TRIANGLES );
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for (i = 0 ; i < num_tri_verts ; i++)
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glArrayElement( tri_indices[i] );
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glEnd();
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}
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break;
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case (NOT_COMPILED|IMMEDIATE|TRIANGLES):
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if (state & MATERIALS) {
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case (IMMEDIATE|GLVERTEX|TRIANGLES):
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if (with_state & MATERIALS) {
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for (j = i = 0 ; i < num_tri_verts ; i += 600, j++) {
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GLuint nr = MIN(num_tri_verts-i, 600);
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GLuint k;
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@ -385,6 +407,13 @@ static void draw_surface( void )
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}
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break;
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case (DISPLAYLIST|GLVERTEX|STRIPS):
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if (!surf1)
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surf1 = BuildList( GL_COMPILE_AND_EXECUTE );
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else
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glCallList(surf1);
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break;
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#endif
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/* Uses the original arrays (including duplicate elements):
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@ -404,18 +433,27 @@ static void draw_surface( void )
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static void Display(void)
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{
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glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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draw_surface();
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draw_surface( state );
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glFlush();
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if (doubleBuffer) glutSwapBuffers();
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}
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int BuildList( int mode )
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{
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int rv = glGenLists(1);
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glNewList(rv, mode );
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draw_surface( IMMEDIATE|GLVERTEX|STRIPS );
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glEndList();
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return rv;
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}
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/* KW: only do this when necessary, so CVA can re-use results.
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*/
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static void set_matrix( void )
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{
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -6.0 );
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glTranslatef( 0.0, 0.0, dist );
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glRotatef( yrot, 0.0, 1.0, 0.0 );
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glRotatef( xrot, 1.0, 0.0, 0.0 );
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}
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@ -548,10 +586,23 @@ static void ModeMenu(int m)
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}
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}
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if (CHANGED(state, m, FOG_MASK)) {
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if (m & FOG)
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{
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glEnable(GL_FOG);
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printf("FOG enable\n");
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}
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else
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{
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glDisable(GL_FOG);
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printf("FOG disable\n");
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}
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}
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#ifdef GL_EXT_vertex_array
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if (CHANGED(state, m, (COMPILED_MASK|RENDER_STYLE_MASK|PRIMITIVE_MASK)))
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{
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if ((m & (COMPILED_MASK|PRIMITIVE_MASK)) == (NOT_COMPILED|STRIPS))
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if ((m & (COMPILED_MASK|PRIMITIVE_MASK)) == (IMMEDIATE|STRIPS))
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{
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glVertexPointerEXT( 3, GL_FLOAT, sizeof(data[0]), numverts, data );
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glNormalPointerEXT( GL_FLOAT, sizeof(data[0]), numverts, &data[0][3]);
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@ -588,6 +639,8 @@ static void ModeMenu(int m)
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static void Init(void)
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{
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GLfloat fogColor[4] = {0.5,1.0,0.5,1.0};
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glEnable( GL_DEPTH_TEST );
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glEnable( GL_VERTEX_ARRAY_EXT );
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@ -616,20 +669,30 @@ static void Init(void)
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exit(1);
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}
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/* Green fog is easy to see */
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glFogi(GL_FOG_MODE,GL_EXP2);
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glFogfv(GL_FOG_COLOR,fogColor);
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glFogf(GL_FOG_DENSITY,0.15);
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glHint(GL_FOG_HINT,GL_DONT_CARE);
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if (allowed & COMPILED) {
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compactify_arrays();
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make_tri_indices();
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}
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surf1 = BuildList( GL_COMPILE );
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ModeMenu(SHADE_SMOOTH|
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LIT|
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NO_TEXTURE|
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NO_REFLECT|
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POINT_FILTER|
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NOT_COMPILED|
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IMMEDIATE|
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NO_USER_CLIP|
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NO_MATERIALS|
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IMMEDIATE);
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NO_FOG|
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GLVERTEX);
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}
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@ -644,44 +707,57 @@ static void Reshape(int width, int height)
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static void Key( unsigned char key, int x, int y )
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{
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switch (key) {
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case 27:
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exit(0);
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case 's':
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ModeMenu((state ^ SHADE_MASK) & SHADE_MASK);
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break;
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case 'l':
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ModeMenu((state ^ LIGHT_MASK) & LIGHT_MASK);
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break;
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case 'm':
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ModeMenu((state ^ MATERIAL_MASK) & MATERIAL_MASK);
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break;
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case 'c':
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ModeMenu((state ^ CLIP_MASK) & CLIP_MASK);
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break;
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case 'b':
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Benchmark(5.0, 0);
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break;
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case 'B':
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Benchmark(0, 5.0);
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break;
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case '-':
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case '_':
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plane[3] += 2.0;
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glClipPlane(GL_CLIP_PLANE0, plane);
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set_matrix();
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glutPostRedisplay();
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break;
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case '+':
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case '=':
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plane[3] -= 2.0;
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glClipPlane(GL_CLIP_PLANE0, plane);
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set_matrix();
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glutPostRedisplay();
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break;
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case 27:
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exit(0);
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case 'f':
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ModeMenu((state ^ FOG_MASK) & FOG_MASK);
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break;
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case 's':
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ModeMenu((state ^ SHADE_MASK) & SHADE_MASK);
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break;
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case 'l':
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ModeMenu((state ^ LIGHT_MASK) & LIGHT_MASK);
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break;
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case 'm':
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ModeMenu((state ^ MATERIAL_MASK) & MATERIAL_MASK);
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break;
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case 'c':
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ModeMenu((state ^ CLIP_MASK) & CLIP_MASK);
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break;
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case 'b':
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Benchmark(5.0, 0);
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break;
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case 'B':
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Benchmark(0, 5.0);
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break;
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case 'i':
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dist += .25;
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set_matrix();
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glutPostRedisplay();
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break;
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case 'I':
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dist -= .25;
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set_matrix();
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glutPostRedisplay();
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break;
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case '-':
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case '_':
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plane[3] += 2.0;
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glClipPlane(GL_CLIP_PLANE0, plane);
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set_matrix();
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glutPostRedisplay();
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break;
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case '+':
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case '=':
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plane[3] -= 2.0;
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glClipPlane(GL_CLIP_PLANE0, plane);
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set_matrix();
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glutPostRedisplay();
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break;
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}
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}
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@ -782,21 +858,27 @@ int main(int argc, char **argv)
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glutAddMenuEntry("Smooth", SHADE_SMOOTH);
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glutAddMenuEntry("Flat", SHADE_FLAT);
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glutAddMenuEntry("", 0);
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glutAddMenuEntry("Fog", FOG);
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glutAddMenuEntry("No Fog", NO_FOG);
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glutAddMenuEntry("", 0);
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glutAddMenuEntry("Point Filtered", POINT_FILTER);
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glutAddMenuEntry("Linear Filtered", LINEAR_FILTER);
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glutAddMenuEntry("", 0);
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glutAddMenuEntry("Immediate (STRIPS)", NOT_COMPILED|IMMEDIATE|STRIPS);
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glutAddMenuEntry("Immediate (TRIANGLES)", NOT_COMPILED|IMMEDIATE|TRIANGLES);
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glutAddMenuEntry("glVertex (STRIPS)", IMMEDIATE|GLVERTEX|STRIPS);
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glutAddMenuEntry("glVertex (TRIANGLES)", IMMEDIATE|GLVERTEX|TRIANGLES);
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glutAddMenuEntry("", 0);
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glutAddMenuEntry("glVertex display list (STRIPS)",
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DISPLAYLIST|GLVERTEX|STRIPS);
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glutAddMenuEntry("", 0);
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if (allowed & DRAW_ARRAYS) {
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glutAddMenuEntry("DrawArrays (STRIPS)",
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NOT_COMPILED|DRAW_ARRAYS|STRIPS);
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IMMEDIATE|DRAW_ARRAYS|STRIPS);
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glutAddMenuEntry("ArrayElement (STRIPS)",
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NOT_COMPILED|ARRAY_ELT|STRIPS);
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IMMEDIATE|ARRAY_ELT|STRIPS);
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glutAddMenuEntry("DrawElements (TRIANGLES)",
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NOT_COMPILED|DRAW_ARRAYS|TRIANGLES);
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IMMEDIATE|DRAW_ARRAYS|TRIANGLES);
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glutAddMenuEntry("ArrayElement (TRIANGLES)",
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NOT_COMPILED|ARRAY_ELT|TRIANGLES);
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IMMEDIATE|ARRAY_ELT|TRIANGLES);
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glutAddMenuEntry("", 0);
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}
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@ -805,7 +887,9 @@ int main(int argc, char **argv)
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COMPILED|DRAW_ARRAYS|TRIANGLES);
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glutAddMenuEntry("Compiled DrawElements (STRIPS)",
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COMPILED|DRAW_ARRAYS|STRIPS);
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glutAddMenuEntry("Compiled ArrayElement",
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glutAddMenuEntry("Compiled ArrayElement (TRIANGLES)",
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COMPILED|ARRAY_ELT|TRIANGLES);
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glutAddMenuEntry("Compiled ArrayElement (STRIPS)",
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COMPILED|ARRAY_ELT|STRIPS);
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glutAddMenuEntry("", 0);
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}
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