BLT-With-Graphics-Template/include/blt/gfx/state.h

105 lines
3.1 KiB
C++

/*
* <Short Description>
* Copyright (C) 2023 Brett Terpstra
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef BLT_WITH_GRAPHICS_STATE_H
#define BLT_WITH_GRAPHICS_STATE_H
#include <blt/gfx/shader.h>
#include <blt/math/vectors.h>
#include <blt/math/matrix.h>
namespace blt::gfx
{
/**
* layout (std140) uniform GlobalMatrices
* {
* mat4 perspective; // full 3d perspective matrix
* mat4 ortho; // full 2d orthographic matrix
* mat4 view; // view matrix
* mat4 pvm; // perspective view matrix
* mat4 ovm; // ortho view matrix
* };
*/
class matrix_state_manager
{
private:
blt::mat4x4 perspective;
blt::mat4x4 ortho;
blt::mat4x4 view;
blt::mat4x4 pvm;
blt::mat4x4 ovm;
blt::mat4x4 view_2d;
blt::vec3 scale_2d;
std::int32_t last_width = 0, last_height = 0;
uniform_buffer* global_matrix_ubo = nullptr;
public:
[[nodiscard]] inline const blt::mat4x4& computedPVM() const
{
return pvm;
}
[[nodiscard]] inline const blt::mat4x4& computedOVM() const
{
return ovm;
}
void create_internals()
{
global_matrix_ubo = new uniform_buffer(sizeof(blt::mat4x4) * 5);
}
void cleanup()
{
delete global_matrix_ubo;
}
template<typename U>
void setView(U&& mat)
{
view = (mat);
}
template<typename U, typename G>
void setView2D(U&& mat, G&& scale)
{
view_2d = (mat);
scale_2d = (scale);
}
template<typename U>
void setPerspective(U&& mat)
{
perspective = (mat);
}
template<typename U>
void setOrtho(U&& mat)
{
ortho = (mat);
}
void update_perspectives(std::int32_t width, std::int32_t height, float fov = 90, float near = 0.1f, float far = 500.0f,
float ortho_near = 0, float ortho_far = 1.1);
void update();
};
}
#endif //BLT_WITH_GRAPHICS_STATE_H