TexturedQuad.hpp

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#ifndef DONUT_GRAPHICS_TEXTURED_QUAD_HPP
#define DONUT_GRAPHICS_TEXTURED_QUAD_HPP
 
#include <donut/graphics/Mesh.hpp>
#include <donut/math.hpp>
 
#include <array>   // std::array
#include <cstdint> // std::int32_t
 
namespace donut::graphics {
 
struct TexturedQuad {
    struct Vertex {
        vec2 coordinates; 
    };
 
    struct Instance {
        mat3 transformation;        
        vec4 textureOffsetAndScale; 
        vec4 tintColor;             
    };
 
    static constexpr MeshBufferUsage VERTICES_USAGE = MeshBufferUsage::STATIC_DRAW;
 
    static constexpr MeshBufferUsage INSTANCES_USAGE = MeshBufferUsage::STREAM_DRAW;
 
    static constexpr MeshPrimitiveType PRIMITIVE_TYPE = MeshPrimitiveType::TRIANGLE_STRIP;
 
    static constexpr std::array<Vertex, 4> VERTICES{{
        {.coordinates{0.0f, 0.0f}},
        {.coordinates{0.0f, 1.0f}},
        {.coordinates{1.0f, 0.0f}},
        {.coordinates{1.0f, 1.0f}},
    }};
 
    static constexpr std::int32_t TEXTURE_UNIT = 0;       
    static constexpr std::int32_t TEXTURE_UNIT_COUNT = 1; 
 
    Mesh<Vertex, NoIndex, Instance> mesh{VERTICES_USAGE, INSTANCES_USAGE, VERTICES, {}};
};
 
} // namespace donut::graphics
 
#endif