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#include "shaders/lightmap.hpp"
#include "compat/assert.hpp"
#include "src/tile-defs.hpp"
#include "loader/loader.hpp"
#include <Corrade/Containers/Iterable.h>
#include <Magnum/Magnum.h>
#include <Magnum/GL/MeshView.h>
#include <Magnum/GL/Shader.h>
#include <Magnum/GL/Version.h>
//#include "src/tile-bbox.hpp"
#if defined __CLION_IDE__ || defined __clang__
#pragma GCC diagnostic ignored "-Wfloat-equal"
#endif
namespace floormat {
namespace {
constexpr auto chunk_size = TILE_SIZE2 * TILE_MAX_DIM;
constexpr auto chunk_offset = TILE_SIZE2/2;
constexpr auto image_size = iTILE_SIZE2 * TILE_MAX_DIM;
constexpr auto buffer_size = 256uz;
} // namespace
auto lightmap_shader::make_framebuffer() -> Framebuffer
{
Framebuffer framebuffer;
framebuffer.fb = GL::Framebuffer{{ {}, image_size }};
framebuffer.color = GL::Texture2D{};
framebuffer.color.setStorage(1, GL::TextureFormat::RGB8, image_size);
//framebuffer.depth = GL::Renderbuffer{};
//framebuffer.depth.setStorage(GL::RenderbufferFormat::DepthComponent32F, fb_size);
framebuffer.fb.attachTexture(GL::Framebuffer::ColorAttachment{0}, framebuffer.color, 0);
//framebuffer.fb.attachRenderbuffer(GL::Framebuffer::BufferAttachment::Depth, framebuffer.depth);
framebuffer.fb.clearColor(0, Color4{0.f, 0.f, 0.f, 1.f});
//framebuffer.fb.clearDepth(0);
return framebuffer;
}
GL::Mesh lightmap_shader::make_mesh()
{
GL::Mesh mesh{GL::MeshPrimitive::Triangles};
mesh.addVertexBuffer(_vertex_buf, 0, Position{})
.setIndexBuffer(_index_buf, 0, GL::MeshIndexType::UnsignedShort)
.setCount(int32_t(6 * buffer_size));
return mesh;
}
lightmap_shader::lightmap_shader() :
framebuffer { make_framebuffer() },
_quads { ValueInit, buffer_size },
_indexes { ValueInit, buffer_size },
_vertex_buf { _quads },
_index_buf { _indexes },
_mesh { make_mesh() }
{
constexpr auto min_version = GL::Version::GL330;
const auto version = GL::Context::current().version();
if (version < min_version)
fm_abort("floormat requires OpenGL version %d, only %d is supported", (int)min_version, (int)version);
GL::Shader vert{version, GL::Shader::Type::Vertex};
GL::Shader frag{version, GL::Shader::Type::Fragment};
vert.addSource(loader.shader("shaders/lightmap.vert"));
frag.addSource(loader.shader("shaders/lightmap.frag"));
CORRADE_INTERNAL_ASSERT_OUTPUT(vert.compile());
CORRADE_INTERNAL_ASSERT_OUTPUT(frag.compile());
attachShaders({vert, frag});
CORRADE_INTERNAL_ASSERT_OUTPUT(link());
}
void lightmap_shader::flush_vertexes()
{
if (_count > 0)
{
_index_buf.setSubData(0, ArrayView<std::array<UnsignedShort, 6>>{_indexes, 1});
_vertex_buf.setSubData(0, ArrayView<std::array<Vector2, 4>>{_quads, 1});
GL::MeshView mesh{_mesh};
mesh.setCount((int)(6 * _count));
mesh.setIndexRange(0, 0, (uint32_t)(_count * 6 - 1));
AbstractShaderProgram::draw(mesh);
_count = 0;
}
}
std::array<UnsignedShort, 6> lightmap_shader::quad_indexes(size_t N)
{
using u16 = UnsignedShort;
return { /* 3--1 1 */
(u16)(0+N*4), (u16)(1+N*4), (u16)(2+N*4), /* | / /| */
(u16)(2+N*4), (u16)(1+N*4), (u16)(3+N*4), /* |/ / | */
}; /* 2 2--0 */
}
void lightmap_shader::add_light(Vector2i neighbor_offset, const light_s& light)
{
fm_debug_assert(_count == 0);
fm_debug_assert(_quads.size() > 0);
constexpr auto tile_size = TILE_SIZE2.sum()/2;
constexpr auto scale = 2/chunk_size;
float I;
switch (light.falloff)
{
default:
I = 1;
break;
case light_falloff::linear:
I = light.dist * tile_size / 5;
break;
case light_falloff::quadratic:
I = light.dist * tile_size * 100;
break;
}
I = std::fmax(1.f, I);
auto I_clip = I * tile_size;
auto center = light.center + chunk_offset + Vector2(neighbor_offset)*chunk_size;
auto center_clip = Vector2{center} * scale; // clip coordinate
constexpr auto image_size_factor = Vector2(image_size) / Vector2(chunk_size);
auto center_fragcoord = center * image_size_factor; // window-relative coordinates
_indexes[_count] = quad_indexes(0);
_quads[_count] = std::array<Vector2, 4>{{
{ I_clip + center_clip.x(), -I_clip + center_clip.y() },
{ I_clip + center_clip.x(), I_clip + center_clip.y() },
{ -I_clip + center_clip.x(), -I_clip + center_clip.y() },
{ -I_clip + center_clip.x(), I_clip + center_clip.y() },
}};
_count++;
float alpha = light.color.a() / 255.f;
auto color = Vector3{light.color.rgb()} / 255.f;
setUniform(ColorIntensityUniform, Vector4{Vector3{color} * alpha, I });
setUniform(CenterUniform, center_fragcoord);
setUniform(FalloffUniform, (uint32_t)light.falloff);
setUniform(SizeUniform, 1.f/image_size_factor);
}
lightmap_shader::~lightmap_shader() = default;
void lightmap_shader::clear()
{
framebuffer.fb.clearColor(0, Vector4ui{0});
//framebuffer.fb.clearDepth(0);
}
void lightmap_shader::bind()
{
framebuffer.fb.bind();
}
void lightmap_shader::begin(Vector2i neighbor_offset, const light_s& light)
{
fm_assert(_count == 0);
clear();
bind();
add_light(neighbor_offset, light);
}
void lightmap_shader::end()
{
flush_vertexes();
}
GL::Texture2D& lightmap_shader::texture()
{
fm_assert(_count == 0);
fm_debug_assert(framebuffer.color.id());
return framebuffer.color;
}
bool light_s::operator==(const light_s&) const noexcept = default;
} // namespace floormat
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