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/*************************************************************************
* Copyright (C) 2009 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of Dimension. *
* *
* Dimension is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 3 of the License, or (at *
* your option) any later version. *
* *
* Dimension is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "realize.h"
#include "parse.h"
#include "utility.h"
#include <math.h>
static double
dmnsn_realize_float(dmnsn_astnode astnode)
{
dmnsn_astnode lhs, rhs;
switch (astnode.type) {
case DMNSN_AST_FLOAT:
return *(double *)astnode.ptr;
case DMNSN_AST_INTEGER:
return *(long *)astnode.ptr;
case DMNSN_AST_NEGATE:
dmnsn_array_get(astnode.children, 0, &rhs);
return -dmnsn_realize_float(rhs);
case DMNSN_AST_ADD:
dmnsn_array_get(astnode.children, 0, &lhs);
dmnsn_array_get(astnode.children, 1, &rhs);
return dmnsn_realize_float(lhs) + dmnsn_realize_float(rhs);
case DMNSN_AST_SUB:
dmnsn_array_get(astnode.children, 0, &lhs);
dmnsn_array_get(astnode.children, 1, &rhs);
return dmnsn_realize_float(lhs) - dmnsn_realize_float(rhs);
case DMNSN_AST_MUL:
dmnsn_array_get(astnode.children, 0, &lhs);
dmnsn_array_get(astnode.children, 1, &rhs);
return dmnsn_realize_float(lhs) * dmnsn_realize_float(rhs);
case DMNSN_AST_DIV:
dmnsn_array_get(astnode.children, 0, &lhs);
dmnsn_array_get(astnode.children, 1, &rhs);
return dmnsn_realize_float(lhs) / dmnsn_realize_float(rhs);
default:
dmnsn_error(DMNSN_SEVERITY_HIGH, "Invalid arithmetic expression.");
return 0; /* Silence compiler warning */
}
}
static dmnsn_vector
dmnsn_realize_vector(dmnsn_astnode astnode)
{
if (astnode.type != DMNSN_AST_VECTOR) {
dmnsn_error(DMNSN_SEVERITY_HIGH, "Expected a vector.");
}
dmnsn_astnode xnode, ynode, znode;
dmnsn_array_get(astnode.children, 0, &xnode);
dmnsn_array_get(astnode.children, 1, &ynode);
dmnsn_array_get(astnode.children, 2, &znode);
double x = dmnsn_realize_float(xnode),
y = dmnsn_realize_float(ynode),
z = dmnsn_realize_float(znode);
return dmnsn_vector_construct(x, y, z);
}
dmnsn_object *
dmnsn_realize_box(dmnsn_astnode astnode)
{
if (astnode.type != DMNSN_AST_BOX) {
dmnsn_error(DMNSN_SEVERITY_HIGH, "Expected a box.");
}
dmnsn_astnode corner1, corner2;
dmnsn_array_get(astnode.children, 0, &corner1);
dmnsn_array_get(astnode.children, 1, &corner2);
dmnsn_vector x1 = dmnsn_realize_vector(corner1),
x2 = dmnsn_realize_vector(corner2);
dmnsn_object *box = dmnsn_new_cube();
if (!box) {
dmnsn_error(DMNSN_SEVERITY_HIGH, "Couldn't allocate box.");
}
box->trans = dmnsn_scale_matrix(
dmnsn_vector_construct(fabs(x2.x - x1.x)/2.0,
fabs(x2.y - x1.y)/2.0,
fabs(x2.z - x1.z)/2.0)
);
box->trans = dmnsn_matrix_mul(
dmnsn_translation_matrix(dmnsn_vector_construct((x2.x + x1.x)/2.0,
(x2.y + x1.y)/2.0,
(x2.z + x1.z)/2.0)),
box->trans
);
return box;
}
dmnsn_object *
dmnsn_realize_sphere(dmnsn_astnode astnode)
{
if (astnode.type != DMNSN_AST_SPHERE) {
dmnsn_error(DMNSN_SEVERITY_HIGH, "Expected a sphere.");
}
dmnsn_astnode center, radius;
dmnsn_array_get(astnode.children, 0, ¢er);
dmnsn_array_get(astnode.children, 1, &radius);
dmnsn_vector x0 = dmnsn_realize_vector(center);
double r = dmnsn_realize_float(radius);
dmnsn_object *sphere = dmnsn_new_sphere();
if (!sphere) {
dmnsn_error(DMNSN_SEVERITY_HIGH, "Couldn't allocate sphere.");
}
sphere->texture = dmnsn_new_texture();
if (!sphere->texture) {
dmnsn_delete_object(sphere);
dmnsn_error(DMNSN_SEVERITY_HIGH, "Couldn't allocate sphere texture.");
}
sphere->texture->pigment = dmnsn_new_solid_pigment(dmnsn_white);
if (!sphere->texture->pigment) {
dmnsn_delete_object(sphere);
dmnsn_error(DMNSN_SEVERITY_HIGH, "Couldn't allocate sphere pigment.");
}
sphere->trans = dmnsn_scale_matrix(dmnsn_vector_construct(r, r, r));
sphere->trans = dmnsn_matrix_mul(dmnsn_translation_matrix(x0), sphere->trans);
return sphere;
}
dmnsn_scene *
dmnsn_realize(const dmnsn_array *astree)
{
dmnsn_scene *scene = dmnsn_new_scene();
if (!scene) {
return NULL;
}
/* Background color */
dmnsn_sRGB background_sRGB = { .R = 0.0, .G = 0.0, .B = 0.1 };
scene->background = dmnsn_color_from_sRGB(background_sRGB);
scene->background.filter = 0.1;
/* Allocate a canvas */
scene->canvas = dmnsn_new_canvas(768, 480);
if (!scene->canvas) {
dmnsn_delete_scene(scene);
return NULL;
}
/* Set up the transformation matrix for the perspective camera */
dmnsn_matrix trans = dmnsn_scale_matrix(
dmnsn_vector_construct(
((double)scene->canvas->x)/scene->canvas->y, 1.0, 1.0
)
);
trans = dmnsn_matrix_mul(
dmnsn_translation_matrix(dmnsn_vector_construct(0.0, 0.0, -4.0)),
trans
);
trans = dmnsn_matrix_mul(
dmnsn_rotation_matrix(dmnsn_vector_construct(0.0, 1.0, 0.0)),
trans
);
trans = dmnsn_matrix_mul(
dmnsn_rotation_matrix(dmnsn_vector_construct(-0.75, 0.0, 0.0)),
trans
);
/* Create a perspective camera */
scene->camera = dmnsn_new_perspective_camera();
if (!scene->camera) {
dmnsn_delete_scene(scene);
return NULL;
}
dmnsn_set_perspective_camera_trans(scene->camera, trans);
/*
* Now parse the abstract syntax tree
*/
dmnsn_astnode astnode;
unsigned int i;
for (i = 0; i < dmnsn_array_size(astree); ++i) {
dmnsn_array_get(astree, i, &astnode);
dmnsn_object *object;
switch (astnode.type) {
case DMNSN_AST_BOX:
object = dmnsn_realize_box(astnode);
dmnsn_array_push(scene->objects, &object);
break;
case DMNSN_AST_SPHERE:
object = dmnsn_realize_sphere(astnode);
dmnsn_array_push(scene->objects, &object);
break;
default:
fprintf(stderr, "Unrecognised syntax element '%s'.\n",
dmnsn_astnode_string(astnode.type));
dmnsn_delete_scene(scene);
return NULL;
}
}
return scene;
}
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