41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
#include "math_.h"
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#include "glm/ext/matrix_transform.hpp"
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using namespace glm;
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namespace game::util::math
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{
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mat4 quad_model_get(vec2 size, vec2 position, vec2 pivot, vec2 scale, float rotation)
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{
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vec2 scaleAbsolute = glm::abs(scale);
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vec2 scaleSign = glm::sign(scale);
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vec2 pivotScaled = pivot * scaleAbsolute;
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vec2 sizeScaled = size * scaleAbsolute;
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mat4 model(1.0f);
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model = glm::translate(model, vec3(position - pivotScaled, 0.0f));
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model = glm::translate(model, vec3(pivotScaled, 0.0f));
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model = glm::scale(model, vec3(scaleSign, 1.0f));
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model = glm::rotate(model, glm::radians(rotation), vec3(0, 0, 1));
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model = glm::translate(model, vec3(-pivotScaled, 0.0f));
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model = glm::scale(model, vec3(sizeScaled, 1.0f));
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return model;
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}
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mat4 quad_model_parent_get(vec2 position, vec2 pivot, vec2 scale, float rotation)
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{
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vec2 scaleSign = glm::sign(scale);
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vec2 scaleAbsolute = glm::abs(scale);
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float handedness = (scaleSign.x * scaleSign.y) < 0.0f ? -1.0f : 1.0f;
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mat4 local(1.0f);
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local = glm::translate(local, vec3(pivot, 0.0f));
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local = glm::scale(local, vec3(scaleSign, 1.0f));
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local = glm::rotate(local, glm::radians(rotation) * handedness, vec3(0, 0, 1));
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local = glm::translate(local, vec3(-pivot, 0.0f));
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local = glm::scale(local, vec3(scaleAbsolute, 1.0f));
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return glm::translate(mat4(1.0f), vec3(position, 0.0f)) * local;
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}
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} |