79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
#include "math.h"
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#include <glm/ext/matrix_transform.hpp>
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#include <string>
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using namespace glm;
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namespace anm2ed::util::math
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{
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constexpr auto FLOAT_FORMAT_MAX_DECIMALS = 7;
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constexpr auto FLOAT_FORMAT_EPSILON = 1e-7f;
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constexpr float FLOAT_FORMAT_POW10[] = {1.f, 10.f, 100.f, 1000.f, 10000.f, 100000.f, 1000000.f, 10000000.f};
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float round_nearest_multiple(float value, float multiple) { return (roundf((value) / (multiple)) * (multiple)); }
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int float_decimals_needed(float value)
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{
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for (int decimalCount = 0; decimalCount <= FLOAT_FORMAT_MAX_DECIMALS; ++decimalCount)
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{
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auto scale = FLOAT_FORMAT_POW10[decimalCount];
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auto rounded = roundf(value * scale) / scale;
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if (fabsf(value - rounded) < FLOAT_FORMAT_EPSILON) return decimalCount;
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}
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return FLOAT_FORMAT_MAX_DECIMALS;
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}
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const char* float_format_get(float value)
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{
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static std::string formatString{};
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int decimalCount = float_decimals_needed(value);
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formatString = (decimalCount == 0) ? "%.0f" : ("%." + std::to_string(decimalCount) + "f");
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return formatString.c_str();
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}
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const char* vec2_format_get(vec2& value)
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{
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static std::string formatString{};
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int decimalCountX = float_decimals_needed(value.x);
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int decimalCountY = float_decimals_needed(value.y);
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int decimalCount = (decimalCountX > decimalCountY) ? decimalCountX : decimalCountY;
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formatString = (decimalCount == 0) ? "%.0f" : ("%." + std::to_string(decimalCount) + "f");
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return formatString.c_str();
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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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float handedness = (scaleSign.x * scaleSign.y) < 0.0f ? -1.0f : 1.0f;
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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) * handedness, 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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} |