void AppWindow::initTextures()
{
const int textureCount = 2;
#ifdef WIN32
const char *textures[] =
{
"../barrel_texture_oil.bmp",
"../barrel_texture_wood.bmp"
};
#else
const char *textures[] =
{
"barrel_texture_oil.bmp",
"barrel_texture_wood.bmp"
};
#endif
// Generate the texture handles
glGenTextures(textureCount, &_textures[0]);
// Load the textures
for(int i = 0; i < textureCount; i++)
{
GsImage I;
if(!I.load(textures[i]))
exit(1);
glBindTexture ( GL_TEXTURE_2D, _textures[i] );
glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGBA, I.w(), I.h(), 0, GL_RGBA, GL_UNSIGNED_BYTE, I.data() );
glTexParameterf ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); glTexParameterf ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT ); glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
glGenerateMipmap ( GL_TEXTURE_2D );
glBindTexture(GL_TEXTURE_2D, 0);
I.init(0,0);
}
}
// init programs here, this will be done only once:
void SoTriangles::init (const char *file, GLuint *textures)
{
// Build program:
_vsh.load_and_compile ( GL_VERTEX_SHADER, "../shaders/vsh_smtl_tex_gouraud.glsl" );
_fsh.load_and_compile ( GL_FRAGMENT_SHADER, "../shaders/fsh_tex_gouraud.glsl" );
_prog.init_and_link ( _vsh, _fsh );
// Define buffers needed:
gen_vertex_arrays ( 1 ); // will use at least 1 vertex array
gen_buffers ( 2 ); // will use at least 1 buffer
_prog.uniform_locations (11); // declare here uniforms
//_prog.uniform_location ( 0, "vTransf" ); // each name must appear in the shader
//_prog.uniform_location ( 1, "vProj" );
//...
_prog.uniform_location(0, "vTransf");
_prog.uniform_location(1, "vProj");
_prog.uniform_location(2, "lPos");
_prog.uniform_location(3, "la");
_prog.uniform_location(4, "ld");
_prog.uniform_location(5, "ls");
_prog.uniform_location(6, "ka");
_prog.uniform_location(7, "kd");
_prog.uniform_location(8, "ks");
_prog.uniform_location(9, "sh");
_prog.uniform_location(10, "Tex1");
GsImage I;
if (!I.load(file))
std::cout << "COULD NOT LOAD IMAGE!\n";
else
std::cout << "loaded\n";
//glGenTextures(1, &id); // ids start at 1
glGenTextures(2, textures);
glBindTexture(GL_TEXTURE_2D, *textures);
glTexImage2D(GL_TEXTURE_2D, 0, 4, I.w(), I.h(), 0, GL_RGBA, GL_UNSIGNED_BYTE, I.data());
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
glBindVertexArray(0);
I.init(0, 0); // free image from CPU
if (!I.load("../texture/sides.bmp"))
std::cout << "COULD NOT LOAD IMAGE!\n";
else
std::cout << "loaded\n";
glBindTexture(GL_TEXTURE_2D, textures[1]);
glTexImage2D(GL_TEXTURE_2D, 0, 4, I.w(), I.h(), 0, GL_RGBA, GL_UNSIGNED_BYTE, I.data());
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
glBindVertexArray(0);
I.init(0, 0); // free image from CPU
}
void draw_solid_tube (double len, double rt, double rb, int nfaces, bool smooth, bool texture, GsImage& img)
{
glEnable(GL_COLOR_MATERIAL);
if(App->wireframe){glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);}
else
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glEnable(GL_NORMALIZE);
if(texture)
{
glEnable(GL_TEXTURE_2D);
img.ogl_bind_texture();
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
} else
glDisable(GL_TEXTURE_2D);
if ( rb<=0 ) rb=MINRADIUS;
if ( rt<=0 ) rt=MINRADIUS;
if ( nfaces<3 ) nfaces = 3;
glColor3f(1.0, 1.0, 1.0);
// compute vertical axis:
double dang = (2.0*PI)/double(nfaces);
double ang = 0;
// we will use len as half the length:
len = len/2;
// initial points:
double ibx=rb, iby=-len, ibz=0; // bottom
double itx=rt, ity=+len, itz=0; // top
// current points start as the initial points:
double cbx=ibx, cby=iby, cbz=ibz; // bottom
double ctx=itx, cty=ity, ctz=itz; // top
// declare the "next points" to form the cylinder lines:
double nbx, nby, nbz; // bottom
double ntx, nty, ntz; // top
// declare variables for texture usage
double tx = 1.0;
double tnext = -( 1.0 / nfaces );
//declare vector variables
Vec u, v, w, p, q, r;
// compute the points all around body:
int i=1;
while(i <= nfaces)
{ // rotate the current points:
if ( i<nfaces ) // normal rotation for intermediate points
{ ang += dang;
double ca = cos(ang);
double sa = sin(ang);
nbx=ca*rb; nby=cby; nbz=sa*rb;
ntx=ca*rt; nty=cty; ntz=sa*rt;
}
else // to make a perfect closure, the last points are exactly the first ones
{ nbx=ibx; nby=iby; nbz=ibz;
ntx=itx; nty=ity; ntz=itz;
}
//Calculating vectors and normals for upper and lower parts
u = Vec( (ntx - ctx), (nty - cty), (ntz - ctz) );
v = Vec( (0 - ctx), (len - cty), (0 - ctz) );
w = cross(v, u);
w.normalize();
//Normal for faces
p = Vec( (nbx - cbx), (nby - cby), (nbz - cbz) );
q = Vec( (ctx - cbx), (cty - cby), (ctz - cbz) );
r = cross(q, p);
r.normalize();
//Start drawing
glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
if(!smooth && !texture)
{
glBegin ( GL_TRIANGLES );
//draw top polygons
glNormal3d(w.x, w.y, w.z);
glVertex3d(ctx, cty, ctz); glVertex3d(ntx, nty, ntz); glVertex3d(0, len, 0);
//draw bottom polygons
glNormal3d(-w.x, -w.y, -w.z);
glVertex3d(cbx, cby, cbz); glVertex3d(nbx, nby, nbz); glVertex3d(0, -len, 0);
glEnd();
//draw faces
glBegin(GL_QUADS);
glNormal3d(r.x, r.y, r.z);
glVertex3d(ctx, cty, ctz); glVertex3d(ntx, nty, ntz);
glVertex3d(nbx, nby, nbz); glVertex3d(cbx, cby, cbz);
glEnd();
}
if(smooth && !texture)
{
glBegin ( GL_TRIANGLES );
//draw top polygons
glNormal3d(ctx, cty, ctz); glVertex3d(ctx, cty, ctz);
glNormal3d(ntx, nty, ntz); glVertex3d(ntx, nty, ntz);
glNormal3d(0, len, 0); glVertex3d(0, len, 0);
//draw bottom polygons
glNormal3d(cbx, cby, cbz); glVertex3d(cbx, cby, cbz);
glNormal3d(nbx, nby, nbz); glVertex3d(nbx, nby, nbz);
glNormal3d(0, -len, 0); glVertex3d(0, -len, 0);
//draw faces
glNormal3d(ctx, cty, ctz); glVertex3d(ctx, cty, ctz);
glNormal3d(ntx, nty, ntz); glVertex3d(ntx, nty, ntz);
glNormal3d(cbx, cby, cbz); glVertex3d(cbx, cby, cbz);
glNormal3d(cbx, cby, cbz); glVertex3d(cbx, cby, cbz);
glNormal3d(nbx, nby, nbz); glVertex3d(nbx, nby, nbz);
glNormal3d(ntx, nty, ntz); glVertex3d(ntx, nty, ntz);
glEnd();
}
if(texture)
{
//draw faces
glBegin(GL_QUADS);
glTexCoord2f(tx, 0);
glVertex3d(ctx, cty, ctz);
glTexCoord2f(tx + tnext, 0);
glVertex3d(ntx, nty, ntz);
glTexCoord2f(tx + tnext, 1);
glVertex3d(nbx, nby, nbz);
glTexCoord2f(tx, 1);
glVertex3d(cbx, cby, cbz);
glEnd();
glDisable(GL_TEXTURE_2D);
glBegin ( GL_TRIANGLES );
//draw top polygons
glVertex3d(ctx, cty, ctz);
glVertex3d(ntx, nty, ntz);
glVertex3d(0, len, 0);
//draw bottom polygons
glVertex3d(cbx, cby, cbz);
glVertex3d(nbx, nby, nbz);
glVertex3d(0, -len, 0);
glEnd();
glEnable(GL_TEXTURE_2D);
}
// update current points:
cbx=nbx; cby=nby; cbz=nbz;
ctx=ntx; cty=nty; ctz=ntz;
tx += tnext;
// increment side counter:
i++;
}
// done
glEnd();
}