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zack 2025-05-23 21:13:53 -04:00
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#pragma once
#include <string.h>
#include <vector>
#include <glm/glm.hpp>
enum eBitmapType
{
eBitmapType_2D,
eBitmapType_Cube
};
enum eBitmapFormat
{
eBitmapFormat_UnsignedByte,
eBitmapFormat_Float,
};
/// R/RG/RGB/RGBA bitmaps
struct Bitmap
{
Bitmap() = default;
Bitmap(int w, int h, int comp, eBitmapFormat fmt)
:w_(w), h_(h), comp_(comp), fmt_(fmt), data_(w * h * comp * getBytesPerComponent(fmt))
{
initGetSetFuncs();
}
Bitmap(int w, int h, int d, int comp, eBitmapFormat fmt)
:w_(w), h_(h), d_(d), comp_(comp), fmt_(fmt), data_(w * h * d * comp * getBytesPerComponent(fmt))
{
initGetSetFuncs();
}
Bitmap(int w, int h, int comp, eBitmapFormat fmt, const void* ptr)
:w_(w), h_(h), comp_(comp), fmt_(fmt), data_(w * h * comp * getBytesPerComponent(fmt))
{
initGetSetFuncs();
memcpy(data_.data(), ptr, data_.size());
}
int w_ = 0;
int h_ = 0;
int d_ = 1;
int comp_ = 3;
eBitmapFormat fmt_ = eBitmapFormat_UnsignedByte;
eBitmapType type_ = eBitmapType_2D;
std::vector<uint8_t> data_;
static int getBytesPerComponent(eBitmapFormat fmt)
{
if (fmt == eBitmapFormat_UnsignedByte) return 1;
if (fmt == eBitmapFormat_Float) return 4;
return 0;
}
void setPixel(int x, int y, const glm::vec4& c)
{
(*this.*setPixelFunc)(x, y, c);
}
glm::vec4 getPixel(int x, int y) const
{
return ((*this.*getPixelFunc)(x, y));
}
private:
using setPixel_t = void(Bitmap::*)(int, int, const glm::vec4&);
using getPixel_t = glm::vec4(Bitmap::*)(int, int) const;
setPixel_t setPixelFunc = &Bitmap::setPixelUnsignedByte;
getPixel_t getPixelFunc = &Bitmap::getPixelUnsignedByte;
void initGetSetFuncs()
{
switch (fmt_)
{
case eBitmapFormat_UnsignedByte:
setPixelFunc = &Bitmap::setPixelUnsignedByte;
getPixelFunc = &Bitmap::getPixelUnsignedByte;
break;
case eBitmapFormat_Float:
setPixelFunc = &Bitmap::setPixelFloat;
getPixelFunc = &Bitmap::getPixelFloat;
break;
}
}
void setPixelFloat(int x, int y, const glm::vec4& c)
{
const int ofs = comp_ * (y * w_ + x);
float* data = reinterpret_cast<float*>(data_.data());
if (comp_ > 0) data[ofs + 0] = c.x;
if (comp_ > 1) data[ofs + 1] = c.y;
if (comp_ > 2) data[ofs + 2] = c.z;
if (comp_ > 3) data[ofs + 3] = c.w;
}
glm::vec4 getPixelFloat(int x, int y) const
{
const int ofs = comp_ * (y * w_ + x);
const float* data = reinterpret_cast<const float*>(data_.data());
return glm::vec4(
comp_ > 0 ? data[ofs + 0] : 0.0f,
comp_ > 1 ? data[ofs + 1] : 0.0f,
comp_ > 2 ? data[ofs + 2] : 0.0f,
comp_ > 3 ? data[ofs + 3] : 0.0f);
}
void setPixelUnsignedByte(int x, int y, const glm::vec4& c)
{
const int ofs = comp_ * (y * w_ + x);
if (comp_ > 0) data_[ofs + 0] = uint8_t(c.x * 255.0f);
if (comp_ > 1) data_[ofs + 1] = uint8_t(c.y * 255.0f);
if (comp_ > 2) data_[ofs + 2] = uint8_t(c.z * 255.0f);
if (comp_ > 3) data_[ofs + 3] = uint8_t(c.w * 255.0f);
}
glm::vec4 getPixelUnsignedByte(int x, int y) const
{
const int ofs = comp_ * (y * w_ + x);
return glm::vec4(
comp_ > 0 ? float(data_[ofs + 0]) / 255.0f : 0.0f,
comp_ > 1 ? float(data_[ofs + 1]) / 255.0f : 0.0f,
comp_ > 2 ? float(data_[ofs + 2]) / 255.0f : 0.0f,
comp_ > 3 ? float(data_[ofs + 3]) / 255.0f : 0.0f);
}
};