void
myOrthoReshape(int w, int h) {
glViewport(0, 0, w, h);
GLfloat aspect = (GLfloat) w / (GLfloat) h;
GLfloat left = ss->lens[0];
GLfloat right = ss->lens[1];
GLfloat bottom = ss->lens[2];
GLfloat top = ss->lens[3];
GLfloat zNear = ss->lens[4];
GLfloat zFar = ss->lens[5];
if (w > h) {
ss->proj = Ortho(left*aspect, right*aspect, bottom, top, zNear, zFar);
} else {
ss->proj = Ortho(left, right, bottom/aspect, top/aspect, zNear, zFar);
}
}
void
display( void )
{
glClearColor( 1.0, 1.0, 1.0, 1.0 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
GLfloat time = (GLfloat) (glutGet(GLUT_ELAPSED_TIME)/1000.0f);
light_pos.x = 1.5f + (sin(time) * 2.0f);
light_pos.z = 2.0f + (cos(time) / 0.5f);
glUniform4fv(glGetUniformLocation(cur_program, "vLight"), 1, light_pos);
// Enable the Shadow Framebuffer
glBindFramebuffer(GL_FRAMEBUFFER, shadow_buffer);
glBindTexture(GL_TEXTURE_2D, shadow_texture);
// Move camera to light position, do an orthographic projection.
SceneState ls;
ls.proj = Ortho(-2.0, 2.0, -2.0, 2.0, 0.01, 10.0);
ls.at = vec3(0.0, 0.0, 0.0);
ls.up = vec3(0.0, 1.0, 0.0);
ls.eye = vec3(light_pos.x, light_pos.y, light_pos.z);
ls.mv = LookAt(
light_pos,
vec4(ls.at, 1.0f),
vec4(ls.up, 0.0f)
);
//printSceneState(&ls);
// Render scene with all objects.
for (unsigned int i = 0; i < objects.size(); ++i) {
objects[i].ss = &ls;
objects[i].draw(shadow_shader);
objects[i].ss = ss;
}
// Disable the Shadow Framebuffer
glBindFramebuffer(GL_FRAMEBUFFER, 0);
//glBindTexture(GL_TEXTURE_2D, 0);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glClearColor( 1.0, 1.0, 1.0, 1.0 );
// Pass ortho proj of light to shader. Multiplied by bias matrix.
// See we want to look up information about vertices in a texture,
// but that texture is defined from 0 to height and 0 to width. We
// want this in projection bounds.
// Pass texture to shader.
mat4 bias(
0.5, 0.0, 0.0, 0.5,
0.0, 0.5, 0.0, 0.5,
0.0, 0.0, 0.5, 0.5,
0.0, 0.0, 0.0, 1.0
);
glUniformMatrix4fv( glGetUniformLocation(cur_program, "ShadowView"),
1, GL_TRUE, ls.mv );
glUniformMatrix4fv( glGetUniformLocation(cur_program, "BiasedShadowProjection"),
1, GL_TRUE, bias*ls.proj );
glUniform1i(glGetUniformLocation(cur_program, "shadowMap"),
shadow_texture);
ss->mv = LookAt(
vec4(ss->eye, 1.0f),
vec4(ss->at, 1.0f),
vec4(ss->up, 0.0f)
);
glUniform1i(glGetUniformLocation(cur_program, "disks" ), disks);
// Render each loaded object file.
for (unsigned int i = 0; i < objects.size(); ++i) {
if (wireframe_vao == i) {
objects[i].wireframe(uniform_color);
// Draw manipulator
for (unsigned int j = 0; j < manipulator.size(); ++j) {
manipulator[j].translate = objects[i].translate;
manipulator[j].draw(uniform_color);
}
} else {
objects[i].draw(cur_program);
}
}
glutSwapBuffers();
}