gboolean on_expose(GtkWidget *drawing, GdkEventExpose *event, gpointer _)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1,1, -1,1, 10,-10);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0, 0, -5);
glEnable(GL_COLOR_MATERIAL);
glDisable(GL_TEXTURE_2D);
glColor3f(1.0, 1.0, 1.0);
/* Create vertexes */
double verts[20][3];
for (int i = 0; i < G_N_ELEMENTS(verts); i++) {
float ang = 2*G_PI * i / G_N_ELEMENTS(verts);
verts[i][0] = sin(ang) * (i%2+0.5) * 0.6;
verts[i][1] = cos(ang) * (i%2+0.5) * 0.6;
verts[i][2] = 0;
}
/* Draw raw polygon */
glColor4f(0.5, 0.0, 0.0, 1.0);
GLUtesselator *tess = gluNewTess();
gluTessCallback(tess, GLU_TESS_BEGIN, glBegin);
gluTessCallback(tess, GLU_TESS_VERTEX, glVertex3dv);
gluTessCallback(tess, GLU_TESS_END, glEnd);
gluTessBeginPolygon(tess, NULL);
gluTessBeginContour(tess);
for (int i = 0; i < G_N_ELEMENTS(verts); i++)
gluTessVertex(tess, verts[i], verts[i]);
gluTessEndContour(tess);
gluTessEndPolygon(tess);
gluDeleteTess(tess);
/* Draw tesselated polygon */
//glColor4f(0.0, 0.0, 0.5, 1.0);
//glBegin(GL_POLYGON);
//for (int i = 0; i < G_N_ELEMENTS(verts); i++)
// glVertex3dv(verts[i]);
//glEnd();
/* Draw outline */
glColor4f(0.8, 0.8, 0.8, 1.0);
glBegin(GL_LINE_LOOP);
for (int i = 0; i < G_N_ELEMENTS(verts); i++)
glVertex3dv(verts[i]);
glEnd();
/* Flush */
GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
if (gdk_gl_drawable_is_double_buffered(gldrawable))
gdk_gl_drawable_swap_buffers(gldrawable);
else
glFlush();
return FALSE;
}
/*************
* Callbacks *
*************/
static gboolean on_expose(GritsTester *tester, GdkEventExpose *event, gpointer _)
{
g_debug("GritsTester: on_expose");
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearDepth(1.0);
glEnable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//glDisable(GL_DEPTH_TEST);
//glBlendFunc(GL_SRC_ALPHA, GL_ONE);
/* Lighting */
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
float light_ambient[] = {0.1f, 0.1f, 0.1f, 1.0f};
float light_diffuse[] = {0.6f, 0.6f, 0.8f, 1.0f};
float light_position[] = {-40.0f, 80.0f, 40.0f, 1.0f};
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glPopMatrix();
glColor4f(1.0f, 1.0f, 1.0f, 0.5f);
/* Draw */
gdk_gl_draw_cube(FALSE, 2);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
for (GList *cur = tester->objects; cur; cur = cur->next)
grits_object_draw(cur->data, NULL);
if (tester->wireframe) {
glDisable(GL_LIGHTING);
glEnable(GL_POLYGON_OFFSET_LINE);
glPolygonOffset(-1,0);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
for (GList *cur = tester->objects; cur; cur = cur->next)
grits_object_draw(cur->data, NULL);
}
/* Flush */
GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
gdk_gl_drawable_swap_buffers(gldrawable);
return FALSE;
}
gboolean on_expose(GtkWidget *drawing, GdkEventExpose *event, gpointer _)
{
glClearColor(0.5, 0.5, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1,1, -1,1, 10,-10);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0, 0, -5);
glEnable(GL_COLOR_MATERIAL);
glDisable(GL_TEXTURE_2D);
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_QUADS);
glVertex3f(-0.25, -0.75, 0.0);
glVertex3f(-0.25, 0.75, 0.0);
glVertex3f( 0.25, 0.75, 0.0);
glVertex3f( 0.25, -0.75, 0.0);
glEnd();
/* Textures */
glDisable(GL_COLOR_MATERIAL);
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
gdouble y = 0.875;
/* Left */
glBlendFunc(GL_ONE, GL_ZERO);
glBindTexture(GL_TEXTURE_2D, texl);
glBegin(GL_QUADS);
glTexCoord2f(0.0, y); glVertex3f(-0.75, 0.0, 0.0);
glTexCoord2f(0.0, 1.0); glVertex3f(-0.75, 0.5, 0.0);
glTexCoord2f(2.0, 1.0); glVertex3f( 0.75, 0.5, 0.0);
glTexCoord2f(2.0, y); glVertex3f( 0.75, 0.0, 0.0);
glEnd();
/* Right */
glBlendFunc(GL_ONE, GL_ONE);
glBindTexture(GL_TEXTURE_2D, texr);
glBegin(GL_QUADS);
glTexCoord2f(-1.0, y); glVertex3f(-0.75, 0.0, 0.0);
glTexCoord2f(-1.0, 1.0); glVertex3f(-0.75, 0.5, 0.0);
glTexCoord2f( 1.0, 1.0); glVertex3f( 0.75, 0.5, 0.0);
glTexCoord2f( 1.0, y); glVertex3f( 0.75, 0.0, 0.0);
glEnd();
/* Bottom */
glBlendFunc(GL_ONE, GL_ZERO);
glBindTexture(GL_TEXTURE_2D, tex);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0); glVertex3f(-0.75, -0.5, 0.0);
glTexCoord2f(0.0, 1.0-y); glVertex3f(-0.75, -0.0, 0.0);
glTexCoord2f(1.0, 1.0-y); glVertex3f( 0.75, -0.0, 0.0);
glTexCoord2f(1.0, 0.0); glVertex3f( 0.75, -0.5, 0.0);
glEnd();
/* Flush */
GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
if (gdk_gl_drawable_is_double_buffered(gldrawable))
gdk_gl_drawable_swap_buffers(gldrawable);
else
glFlush();
return FALSE;
}
