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feat: initialize textures class

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Krzysztof Rudnicki 2023-03-05 18:14:43 +01:00
parent f28d2b917a
commit 5e0a43e158
3 changed files with 88 additions and 0 deletions
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Engine/engine/match
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Engine/engine/textures.cpp Normal file
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#ifndef TEXTURES_CPP
#define TEXTURES_CPP
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include "stb_image.h"
#include "textures.hpp"
void setTextureSCoordinate(const GLenum textureTarget, const GLint sCoordinateOption, const float* borderColor)
{
// https://registry.khronos.org/OpenGL-Refpages/gl4/html/glTexParameter.xhtml
// first argument is texture target (by default we work with 2D textures so it will be GL_TEXTURE_2D)
// second argument is what option we want to set and for which texture axis (s, t or r)
// Third argument is texture wrapping mode
glTexParameteri(textureTarget, GL_TEXTURE_WRAP_S, sCoordinateOption);
if(sCoordinateOption == GL_CLAMP_TO_BORDER && borderColor != NULL)
{
// if we use GL_CLAMP_TO_BORDER all of the space that is not occupied by texture will be occupied by color
// we pass the color we want to use in float array (RGB + transparency)
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
}
}
void setTextureTCoordinate(const GLenum textureTarget, const GLint tCoordinateOption, const float* borderColor)
{
// for comments concerning glTexParameteri and glTexParameterfv go to setTextureSCoordinate function
if(textureTarget == GL_TEXTURE_2D || textureTarget == GL_TEXTURE_3D)
{
glTexParameteri(textureTarget, GL_TEXTURE_WRAP_T, tCoordinateOption);
if(tCoordinateOption == GL_CLAMP_TO_BORDER && borderColor != NULL)
{
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
}
}
}
void setTextureRCoordinate(const GLenum textureTarget, const GLint rCoordinateOption, const float* borderColor)
{
// for comments concerning glTexParameteri and glTexParameterfv go to setTextureSCoordinate function
if(textureTarget == GL_TEXTURE_3D)
{
glTexParameteri(textureTarget, GL_TEXTURE_WRAP_R, rCoordinateOption);
if(rCoordinateOption == GL_CLAMP_TO_BORDER && borderColor != NULL)
{
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
}
}
}
// Coordinate options can be: GL_REPEAT, GL_MIRRORED_REPEAT, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_BORDER
// s t r are equivalent to x y z
void setTextureParametersINT(const GLenum textureTarget, const GLint sCoordinateOption, const GLint tCoordinateOption, const GLint rCoordinateOption, const float* borderColor)
{
setTextureSCoordinate(textureTarget, sCoordinateOption, borderColor);
setTextureTCoordinate(textureTarget, tCoordinateOption, borderColor);
setTextureRCoordinate(textureTarget, rCoordinateOption, borderColor);
}
void setTextureFilteringAndMipMap(const GLenum textureTarget, const GLenum filterType, const GLint textureFilteringMethod, const GLint mipMapFilteringMethod)
{
// mipMapFilteringMethod can be equal to: GL_NEAREST_MIPMAP_NEAREST, GL_LINEAR_MIPMAP_NEAREST, GL_NEAREST_MIPMAP_LINEAR, GL_LINEAR_MIPMAP_LINEAR
// NEAREST_MIPMAP - take nearest mipmap to match pixel size
// LINEAR_MIPMAP - interpolate between two mipmaps that match the size of a pixel
// NEAREST (at the end) - samples texture based on nearest neighbor interpolation
// LINEAR (at the end) - samples texture using linear interpolation
// setting anything else than GL_TEXTURE_MIN_FILTER as a second parameter results in GL_INVALID_ENUM error
glTexParameteri(textureTarget, GL_TEXTURE_MIN_FILTER, mipMapFilteringMethod);
// https://registry.khronos.org/OpenGL-Refpages/gl4/html/glTexParameter.xhtml
// first argument is texture target (by default we work with 2D textures so it will be GL_TEXTURE_2D)
// second argument is specifying whether this filter works for magnifying textures GL_TEXTURE_MAG_FILTER or minifying GL_TEXTURE_MIN_FILTER
// third argument is how we should magnify/minify textures, whether we should choose the color of pixel closest to the coordinates GL_NEAREST (default)
// or should we blend the neighboring pixels and choose blended color GL_LINEAR
glTexParameteri(textureTarget, filterType, textureFilteringMethod);
}
#endif // TEXTURES_CPP

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Engine/engine/textures.hpp Normal file
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#ifndef TEXTURES_HPP
#define TEXTURES_HPP
#include <glad/glad.h>
#include <GLFW/glfw3.h>
void setTextureParametersINT(const GLenum textureTarget = GL_TEXTURE_2D, const GLint sCoordinateOption = GL_REPEAT, const GLint tCoordinateOption = GL_REPEAT, const GLint rCoordinateOption = GL_REPEAT, const float* borderColor = NULL);
void setTextureSCoordinate(const GLenum textureTarget = GL_TEXTURE_2D, const GLint sCoordinateOption = GL_REPEAT, const float* borderColor = NULL);
void setTextureTCoordinate(const GLenum textureTarget = GL_TEXTURE_2D, const GLint tCoordinateOption = GL_REPEAT, const float* borderColor = NULL);
void setTextureRCoordinate(const GLenum textureTarget = GL_TEXTURE_3D, const GLint rCoordinateOption = GL_REPEAT, const float* borderColor = NULL);
void setTextureFilteringAndMipMap(const GLenum textureTarget = GL_TEXTURE_2D, const GLenum filterType = GL_TEXTURE_MAG_FILTER, const GLint textureFilteringMethod = GL_NEAREST, const GLint mipMapFilteringMethod = GL_NEAREST_MIPMAP_NEAREST);
#endif // TEXTURES_HPP