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#include "lighting.hpp"
#include "model.hpp"
#include "renderer.hpp"
#include "scene.hpp"
#include "world.hpp"
extern "C" {
#include "memory.h"
#include "plat.h"
}
/* needs to match surface shader */
struct GPU_Light {
v3f pos;
float brightness;
v3f colour;
int caster_id;
float range;
int pad[3];
};
struct GPU_Caster {
m4f projection;
};
void Lighting::init(Device* dev) {
int i;
Sampler_State ss{};
lights.init(
dev,
"Light buffer",
max_lights * sizeof(GPU_Light),
Buffer_Flags::storage_buffer
);
casters.init(
dev,
"Caster buffer",
max_shadows * sizeof(GPU_Caster),
Buffer_Flags::storage_buffer
);
shadows = dev->create_texture(
"Shadowmap Array",
texture_format_d16,
Texture_Flags::sampleable | Texture_Flags::depth_stencil_target,
shadow_res,
shadow_res,
1,
1,
max_shadows,
0
);
for (i = 0; i < max_shadows; i++) {
cameras[i] = 0;
shadow_slices[i] = dev->alias_texture(
shadows,
"Shadowmap Slice",
texture_format_d16,
Texture_Flags::depth_stencil_target,
shadow_res,
shadow_res,
1,
1,
1,
0,
i
);
}
ss.min = Filter_Mode::linear;
ss.mag = Filter_Mode::linear;
ss.mip = Filter_Mode::linear;
ss.address_u = Address_Mode::border;
ss.address_v = Address_Mode::border;
ss.border[0] = 1.0f;
ss.border[1] = 1.0f;
ss.border[2] = 1.0f;
ss.border[3] = 1.0f;
ss.compare = Depth_Mode::less;
shadow_sampler = dev->create_sampler("shadow sampler", ss);
}
void Lighting::destroy(Device* dev, Renderer& r) {
int i;
lights.destroy(dev);
casters.destroy(dev);
dev->destroy_sampler(shadow_sampler);
for (i = 0; i < max_shadows; i++) {
dev->destroy_texture(shadow_slices[i]);
r.destroy_camera(cameras[i]);
}
dev->destroy_texture(shadows);
}
void Lighting::write_bufs(
void* lptr,
void* cptr,
World& w,
Renderer& r,
Model_Scene& s
) {
GPU_Light* ldst = (GPU_Light*)lptr;
GPU_Caster* cdst = (GPU_Caster*)cptr;
int count = 0, ccount = 0;
sun_range[0] = count;
for (auto v : w.view<Sun_Light>()) {
GPU_Light gl;
Sun_Light& l = v.get<Sun_Light>();
if (count >= max_lights) {
print_war("Over light limit.\n");
goto cancel;
}
gl.brightness = l.brightness;
gl.colour = l.colour;
gl.pos = l.dir;
if (l.caster && ccount < max_shadows) {
int cid = ccount++;
GPU_Caster& c = cdst[cid];
Camera_Id camid = cameras[cid];
if (!camid)
camid = r.create_camera();
Camera& cam = r.get_camera(camid);
cam.init_shadow(l.dir, s.bound.min, s.bound.max);
c.projection = cam.get_proj() * cam.get_view();
cameras[cid] = camid;
gl.caster_id = cid;
} else
gl.caster_id = -1;
ldst[count++] = gl;
}
sun_range[1] = count;
point_range[0] = count;
for (auto v : w.view<Transform, Point_Light>()) {
GPU_Light gl;
Transform& t = v.get<Transform>();
Point_Light& l = v.get<Point_Light>();
if (count >= max_lights) {
print_war("Over light limit.\n");
goto cancel;
}
gl.brightness = l.brightness;
gl.colour = l.colour;
gl.pos = v3f(
t.mat.m[3][0],
t.mat.m[3][1],
t.mat.m[3][2]
);
gl.caster_id = -1;
gl.range = l.range;
ldst[count++] = gl;
}
point_range[1] = count;
cancel:
light_count = count;
caster_count = ccount;
}
void Lighting::update(
Device* dev,
Context& ctx,
World& w,
Renderer& r,
Model_Scene& s
) {
light_count = 0;
write_bufs(lights.map(dev), casters.map(dev), w, r, s);
casters.unmap(dev);
lights.unmap(dev);
lights.update(ctx);
casters.update(ctx);
}
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