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#include "shaders/tile.hpp"
#include "loader/loader.hpp"
#include "compat/assert.hpp"
#include "local-coords.hpp"
#include <cmath>
#include <Corrade/Containers/Iterable.h>
#include <Corrade/Containers/StringStl.h>
#include <Magnum/Math/Vector4.h>
#include <Magnum/GL/Context.h>
#include <Magnum/GL/Shader.h>
#include <Magnum/GL/Version.h>
namespace floormat {
tile_shader::tile_shader()
{
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/tile.vert"));
frag.addSource(loader.shader("shaders/tile.frag"));
CORRADE_INTERNAL_ASSERT_OUTPUT(vert.compile());
CORRADE_INTERNAL_ASSERT_OUTPUT(frag.compile());
attachShaders({vert, frag});
CORRADE_INTERNAL_ASSERT_OUTPUT(link());
set_scale({640, 480});
set_tint({1, 1, 1, 1});
setUniform(OffsetUniform, Vector3{});
}
tile_shader::~tile_shader() = default;
tile_shader& tile_shader::set_scale(const Vector2& scale)
{
if (scale != _scale)
setUniform(ScaleUniform, 2.f/(_scale = scale));
return *this;
}
tile_shader& tile_shader::set_camera_offset(const Vector2d& camera_offset, float depth_offset)
{
_camera_offset = camera_offset;
_depth_offset = depth_offset;
return *this;
}
tile_shader& tile_shader::set_tint(const Vector4& tint)
{
_tint = tint;
return *this;
}
void tile_shader::_draw()
{
fm_assert(std::fabs(_camera_offset[0]) < 1 << 24 && std::fabs(_camera_offset[1]) < 1 << 24);
fm_assert(std::fabs(_depth_offset) < 1 << 24);
if (_tint != _real_tint)
setUniform(TintUniform, _real_tint = _tint);
if (const auto offset = Vector3(Vector2(_camera_offset), _depth_offset);
offset != _real_camera_offset)
{
_real_camera_offset = offset;
setUniform(OffsetUniform, offset);
}
}
float tile_shader::depth_value(const local_coords& xy, float offset) noexcept
{
return (xy.to_index() + offset) * depth_tile_size;
}
} // namespace floormat
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