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/*
Minetest
Copyright (C) 2021 Liso <anlismon@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include <string>
#include <vector>
#include "irrlichttypes_extrabloated.h"
#include "client/shadows/dynamicshadows.h"
class ShadowDepthShaderCB;
class shadowScreenQuad;
class shadowScreenQuadCB;
enum E_SHADOW_MODE : u8
{
ESM_RECEIVE = 0,
ESM_BOTH,
};
struct NodeToApply
{
NodeToApply(scene::ISceneNode *n,
E_SHADOW_MODE m = E_SHADOW_MODE::ESM_BOTH) :
node(n),
shadowMode(m){};
bool operator<(const NodeToApply &other) const { return node < other.node; };
scene::ISceneNode *node;
E_SHADOW_MODE shadowMode{E_SHADOW_MODE::ESM_BOTH};
bool dirty{false};
};
class ShadowRenderer
{
public:
ShadowRenderer(IrrlichtDevice *device, Client *client);
~ShadowRenderer();
void initialize();
/// Adds a directional light shadow map (Usually just one (the sun) except in
/// Tattoine ).
size_t addDirectionalLight();
DirectionalLight &getDirectionalLight(u32 index = 0);
size_t getDirectionalLightCount() const;
f32 getMaxShadowFar() const;
/// Adds a shadow to the scene node.
/// The shadow mode can be ESM_BOTH, or ESM_RECEIVE.
/// ESM_BOTH casts and receives shadows
/// ESM_RECEIVE only receives but does not cast shadows.
///
void addNodeToShadowList(scene::ISceneNode *node,
E_SHADOW_MODE shadowMode = ESM_BOTH);
void removeNodeFromShadowList(scene::ISceneNode *node);
void update(video::ITexture *outputTarget = nullptr);
void drawDebug();
video::ITexture *get_texture()
{
return shadowMapTextureFinal;
}
bool is_active() const { return m_shadows_enabled && shadowMapTextureFinal != nullptr; }
void setTimeOfDay(float isDay) { m_time_day = isDay; };
void setShadowIntensity(float shadow_intensity);
s32 getShadowSamples() const { return m_shadow_samples; }
float getShadowStrength() const { return m_shadows_enabled ? m_shadow_strength : 0.0f; }
float getTimeOfDay() const { return m_time_day; }
f32 getPerspectiveBiasXY() { return m_perspective_bias_xy; }
f32 getPerspectiveBiasZ() { return m_perspective_bias_z; }
private:
video::ITexture *getSMTexture(const std::string &shadow_map_name,
video::ECOLOR_FORMAT texture_format,
bool force_creation = false);
void renderShadowMap(video::ITexture *target, DirectionalLight &light,
scene::E_SCENE_NODE_RENDER_PASS pass =
scene::ESNRP_SOLID);
void renderShadowObjects(video::ITexture *target, DirectionalLight &light);
void mixShadowsQuad();
void updateSMTextures();
void disable();
void enable() { m_shadows_enabled = m_shadows_supported; }
// a bunch of variables
IrrlichtDevice *m_device{nullptr};
scene::ISceneManager *m_smgr{nullptr};
video::IVideoDriver *m_driver{nullptr};
Client *m_client{nullptr};
video::ITexture *shadowMapClientMap{nullptr};
video::ITexture *shadowMapClientMapFuture{nullptr};
video::ITexture *shadowMapTextureFinal{nullptr};
video::ITexture *shadowMapTextureDynamicObjects{nullptr};
video::ITexture *shadowMapTextureColors{nullptr};
std::vector<DirectionalLight> m_light_list;
std::vector<NodeToApply> m_shadow_node_array;
float m_shadow_strength;
float m_shadow_strength_gamma;
float m_shadow_map_max_distance;
float m_shadow_map_texture_size;
float m_time_day{0.0f};
int m_shadow_samples;
bool m_shadow_map_texture_32bit;
bool m_shadows_enabled;
bool m_shadows_supported;
bool m_shadow_map_colored;
u8 m_map_shadow_update_frames; /* Use this number of frames to update map shaodw */
u8 m_current_frame{0}; /* Current frame */
f32 m_perspective_bias_xy;
f32 m_perspective_bias_z;
video::ECOLOR_FORMAT m_texture_format{video::ECOLOR_FORMAT::ECF_R16F};
video::ECOLOR_FORMAT m_texture_format_color{video::ECOLOR_FORMAT::ECF_R16G16};
// Shadow Shader stuff
void createShaders();
std::string readShaderFile(const std::string &path);
s32 depth_shader{-1};
s32 depth_shader_entities{-1};
s32 depth_shader_trans{-1};
s32 mixcsm_shader{-1};
ShadowDepthShaderCB *m_shadow_depth_cb{nullptr};
ShadowDepthShaderCB *m_shadow_depth_entity_cb{nullptr};
ShadowDepthShaderCB *m_shadow_depth_trans_cb{nullptr};
shadowScreenQuad *m_screen_quad{nullptr};
shadowScreenQuadCB *m_shadow_mix_cb{nullptr};
};
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