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various stuff in opengl demos such as a better model,

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stable trackball for the fly navigation mode, and started
to put some GUI elements...
This commit is contained in:
Gael Guennebaud
2008-09-09 18:50:45 +00:00
parent d3a70b7fac
commit 146c9e4494
11 changed files with 530 additions and 142 deletions
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78
demos/opengl/gpuhelper.cpp
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@@ -23,6 +23,7 @@
// Eigen. If not, see <http://www.gnu.org/licenses/>.
#include "gpuhelper.h"
#include "icosphere.h"
#include <GL/glu.h>
// PLEASE don't look at this old code... ;)
@@ -31,26 +32,6 @@
GpuHelper gpu;
//--------------------------------------------------------------------------------
// icosahedron
//--------------------------------------------------------------------------------
#define X .525731112119133606
#define Z .850650808352039932
static GLfloat vdata[12][3] = {
{-X, 0.0, Z}, {X, 0.0, Z}, {-X, 0.0, -Z}, {X, 0.0, -Z},
{0.0, Z, X}, {0.0, Z, -X}, {0.0, -Z, X}, {0.0, -Z, -X},
{Z, X, 0.0}, {-Z, X, 0.0}, {Z, -X, 0.0}, {-Z, -X, 0.0}
};
static GLint tindices[20][3] = {
{0,4,1}, {0,9,4}, {9,5,4}, {4,5,8}, {4,8,1},
{8,10,1}, {8,3,10}, {5,3,8}, {5,2,3}, {2,7,3},
{7,10,3}, {7,6,10}, {7,11,6}, {11,0,6}, {0,1,6},
{6,1,10}, {9,0,11}, {9,11,2}, {9,2,5}, {7,2,11} };
//--------------------------------------------------------------------------------
GpuHelper::GpuHelper()
{
mVpWidth = mVpHeight = 0;
@@ -151,61 +132,10 @@ void GpuHelper::drawUnitCube(void)
glEnd();
}
void _normalize(float* v)
void GpuHelper::drawUnitSphere(int level)
{
float s = 1.f/ei_sqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);
for (uint k=0; k<3; ++k)
v[k] *= s;
}
void _subdivide(float *v1, float *v2, float *v3, long depth)
{
GLfloat v12[3], v23[3], v31[3];
GLint i;
if (depth == 0) {
//drawtriangle(v1, v2, v3);
glNormal3fv(v1);
glVertex3fv(v1);
glNormal3fv(v3);
glVertex3fv(v3);
glNormal3fv(v2);
glVertex3fv(v2);
return;
}
for (i = 0; i < 3; i++) {
v12[i] = v1[i]+v2[i];
v23[i] = v2[i]+v3[i];
v31[i] = v3[i]+v1[i];
}
_normalize(v12);
_normalize(v23);
_normalize(v31);
_subdivide(v1, v12, v31, depth-1);
_subdivide(v2, v23, v12, depth-1);
_subdivide(v3, v31, v23, depth-1);
_subdivide(v12, v23, v31, depth-1);
}
void GpuHelper::drawUnitLightSphere(int level)
{
static int dlId = 0;
if (!dlId)
{
dlId = glGenLists(1);
glNewList(dlId, GL_COMPILE);
glBegin(GL_TRIANGLES);
for (int i = 0; i < 20; i++)
{
_subdivide(&vdata[tindices[i][0]][0], &vdata[tindices[i][1]][0], &vdata[tindices[i][2]][0], 1);
}
glEnd();
glEndList();
}
glCallList(dlId);
static IcoSphere sphere;
sphere.draw(level);
}