73 lines
1.5 KiB
C++
73 lines
1.5 KiB
C++
#pragma once
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#include <cmath>
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#include <glm/vec2.hpp>
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#include <glm/vec4.hpp>
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struct UVRegion {
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float u1;
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float v1;
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float u2;
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float v2;
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UVRegion(float u1, float v1, float u2, float v2)
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: u1(u1), v1(v1), u2(u2), v2(v2) {
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}
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UVRegion() : u1(0.0f), v1(0.0f), u2(1.0f), v2(1.0f) {
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}
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inline float getWidth() const {
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return fabs(u2 - u1);
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}
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inline float getHeight() const {
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return fabs(v2 - v1);
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}
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void autoSub(float w, float h, float x, float y) {
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x *= 1.0f - w;
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y *= 1.0f - h;
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float uvw = getWidth();
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float uvh = getHeight();
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u1 = u1 + uvw * x;
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v1 = v1 + uvh * y;
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u2 = u1 + uvw * w;
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v2 = v1 + uvh * h;
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}
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inline glm::vec2 apply(const glm::vec2& uv) {
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float w = getWidth();
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float h = getHeight();
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return glm::vec2(u1 + uv.x * w, v1 + uv.y * h);
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}
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void scale(float x, float y) {
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float w = u2 - u1;
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float h = v2 - v1;
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float cx = (u1 + u2) * 0.5f;
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float cy = (v1 + v2) * 0.5f;
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u1 = cx - w * 0.5f * x;
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v1 = cy - h * 0.5f * y;
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u2 = cx + w * 0.5f * x;
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v2 = cy + h * 0.5f * y;
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}
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void scale(const glm::vec2& vec) {
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scale(vec.x, vec.y);
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}
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void set(const glm::vec4& vec) {
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u1 = vec.x;
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v1 = vec.y;
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u2 = vec.z;
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v2 = vec.w;
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}
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UVRegion operator*(const glm::vec2& scale) const {
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auto copy = UVRegion(*this);
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copy.scale(scale);
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return copy;
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}
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};
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