paysages3d/lib_paysages/camera.c

298 lines
7.5 KiB
C

#include "camera.h"
#include <stdlib.h>
#include <math.h>
#include "euclid.h"
#include "render.h"
#include "shared/types.h"
#include "shared/constants.h"
#include "scenery.h"
#include "tools.h"
void cameraInit()
{
}
void cameraQuit()
{
}
void cameraSave(FILE* f, CameraDefinition* camera)
{
v3Save(f, &camera->location);
toolsSaveDouble(f, &camera->yaw);
toolsSaveDouble(f, &camera->pitch);
toolsSaveDouble(f, &camera->roll);
}
void cameraLoad(FILE* f, CameraDefinition* camera)
{
v3Load(f, &camera->location);
toolsLoadDouble(f, &camera->yaw);
toolsLoadDouble(f, &camera->pitch);
toolsLoadDouble(f, &camera->roll);
cameraValidateDefinition(camera, 0);
}
CameraDefinition cameraCreateDefinition()
{
CameraDefinition definition;
definition.location.x = 0.0;
definition.location.y = 0.0;
definition.location.z = 0.0;
definition.yaw = 0.0;
definition.pitch = 0.0;
definition.roll = 0.0;
definition.width = 1.0;
definition.height = 1.0;
definition.yfov = 1.57;
definition.xratio = 1.0;
definition.znear = 1.0;
definition.zfar = 1000.0;
cameraValidateDefinition(&definition, 0);
return definition;
}
void cameraDeleteDefinition(CameraDefinition* definition)
{
}
void cameraCopyDefinition(CameraDefinition* source, CameraDefinition* destination)
{
*destination = *source;
cameraValidateDefinition(destination, 0);
}
void cameraValidateDefinition(CameraDefinition* definition, int check_above)
{
WaterDefinition water;
TerrainDefinition terrain;
double water_height, terrain_height, diff;
Vector3 move;
Matrix4 rotation;
if (check_above)
{
water = waterCreateDefinition();
sceneryGetWater(&water);
water_height = water.height + 0.5;
waterDeleteDefinition(&water);
terrain = terrainCreateDefinition();
sceneryGetTerrain(&terrain);
terrain_height = terrainGetHeight(&terrain, definition->location.x, definition->location.z) + 0.5;
terrainDeleteDefinition(&terrain);
if (definition->location.y < water_height || definition->location.y < terrain_height)
{
if (water_height > terrain_height)
{
diff = water_height - definition->location.y;
}
else
{
diff = terrain_height - definition->location.y;
}
move.x = move.z = 0.0;
move.y = diff;
definition->location = v3Add(definition->location, move);
}
}
definition->forward.x = 1.0;
definition->forward.y = 0.0;
definition->forward.z = 0.0;
definition->right.x = 0.0;
definition->right.y = 0.0;
definition->right.z = 1.0;
definition->up.x = 0.0;
definition->up.y = 1.0;
definition->up.z = 0.0;
rotation = m4NewRotateEuler(definition->yaw, definition->pitch, definition->roll);
definition->forward = m4MultPoint(rotation, definition->forward);
definition->right = m4MultPoint(rotation, definition->right);
definition->up = m4MultPoint(rotation, definition->up);
definition->target = v3Add(definition->location, definition->forward);
definition->project = m4Mult(m4NewPerspective(definition->yfov, definition->xratio, definition->znear, definition->zfar), m4NewLookAt(definition->location, definition->target, definition->up));
definition->unproject = m4Inverse(definition->project);
}
void cameraSetLocation(CameraDefinition* camera, double x, double y, double z)
{
camera->location.x = x;
camera->location.y = y;
camera->location.z = z;
cameraValidateDefinition(camera, 0);
}
void cameraSetTarget(CameraDefinition* camera, double x, double y, double z)
{
Vector3 forward, target;
target.x = x;
target.y = y;
target.z = z;
forward = v3Sub(target, camera->location);
if (v3Norm(forward) < 0.0000001)
{
return;
}
forward = v3Normalize(forward);
if (fabs(forward.x) < 0.0000001 && fabs(forward.z) < 0.0000001)
{
/* Forward vector is vertical */
if (forward.y > 0.0)
{
camera->pitch = M_PI_2;
}
else if (forward.y > 0.0)
{
camera->pitch = -M_PI_2;
}
}
else
{
/* TODO Guess angles */
}
cameraValidateDefinition(camera, 0);
}
void cameraSetRoll(CameraDefinition* camera, double angle)
{
camera->roll = angle;
cameraValidateDefinition(camera, 0);
}
void cameraStrafeForward(CameraDefinition* camera, double value)
{
camera->location = v3Add(camera->location, v3Scale(camera->forward, value));
cameraValidateDefinition(camera, 0);
}
void cameraStrafeRight(CameraDefinition* camera, double value)
{
camera->location = v3Add(camera->location, v3Scale(camera->right, value));
cameraValidateDefinition(camera, 0);
}
void cameraStrafeUp(CameraDefinition* camera, double value)
{
camera->location = v3Add(camera->location, v3Scale(camera->up, value));
cameraValidateDefinition(camera, 0);
}
void cameraRotateYaw(CameraDefinition* camera, double value)
{
camera->yaw += value;
cameraValidateDefinition(camera, 0);
}
void cameraRotatePitch(CameraDefinition* camera, double value)
{
camera->pitch += value;
cameraValidateDefinition(camera, 0);
}
void cameraRotateRoll(CameraDefinition* camera, double value)
{
camera->roll += value;
cameraValidateDefinition(camera, 0);
}
void cameraSetRenderSize(CameraDefinition* camera, int width, int height)
{
camera->width = (double)width;
camera->height = (double)height;
camera->xratio = camera->width / camera->height;
cameraValidateDefinition(camera, 0);
}
Vector3 cameraProject(CameraDefinition* camera, Renderer* renderer, Vector3 point)
{
point = m4Transform(camera->project, point);
point.x = (point.x + 1.0) * 0.5 * camera->width;
point.y = (-point.y + 1.0) * 0.5 * camera->height;
return point;
}
Vector3 cameraUnproject(CameraDefinition* camera, Renderer* renderer, Vector3 point)
{
point.x = (point.x / (0.5 * camera->width) - 1.0);
point.y = -(point.y / (0.5 * camera->height) - 1.0);
return m4Transform(camera->unproject, point);
}
void cameraProjectToFragment(CameraDefinition* camera, Renderer* renderer, double x, double y, double z, RenderFragment* result)
{
Vector3 point = {x, y, z};
point = cameraProject(camera, renderer, point);
result->x = lround(point.x);
result->y = lround(point.y);
result->z = point.z;
}
/**
* Render a quad that will fill the view in front of the camera.
* This quad can be used for post-processing.
*
* @param col Color of the polygon.
* @param callback Post-processing callback.
*/
/*void cameraPushOverlay(CameraDefinition* camera, Color col, f_RenderFragmentCallback callback)
{
Vertex v1, v2, v3, v4;
Vector3 v;
v.x = 0.0;
v.y = 0.0;
v.z = 10.0;
v1.location = cameraUnproject(camera, v);
v1.color = col;
v1.callback = callback;
v.x = 0.0;
v.y = (double)render_height;
v.z = 10.0;
v2.location = cameraUnproject(camera, v);
v2.color = col;
v2.callback = callback;
v.x = (double)render_width;
v.y = (double)render_height;
v.z = 10.0;
v3.location = cameraUnproject(camera, v);
v3.color = col;
v3.callback = callback;
v.x = (double)render_width;
v.y = 0.0;
v.z = 10.0;
v4.location = cameraUnproject(camera, v);
v4.color = col;
v4.callback = callback;
renderPushQuad(&v1, &v2, &v3, &v4);
}*/