【OpenGL】Shader个人学习笔记（8）--Textures

最新推荐文章于 2024-11-17 02:23:40 发布

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最新推荐文章于 2024-11-17 02:23:40 发布

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分类专栏： OpenGL 文章标签： opengl shader c++

本文链接：https://blog.youkuaiyun.com/qq_34878429/article/details/106960069

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本文深入探讨了纹理映射的原理，详细介绍了如何通过指定每个顶点的纹理坐标来实现纹理的绘制，并展示了如何使用OpenGL进行纹理加载、设置纹理参数及绑定。纹理映射是计算机图形学中重要的技术之一，它能够使3D模型表面更加真实。

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Texture的原理

specify for each vertex that we have of our rectangle(顶点绘制情况) what area of the texture it should be and then the fragment shader will interpolate between that

即指定为每个顶点,rectangle(顶点绘制情况)区域的结构应该是什么,然后着色器将之间插入片段

Texture.cpp

#include "Texture.h"

#include "vendor/stb_image/stb_image.h"

Texture::Texture(const std::string& path)
	:m_RendererID(0), m_FilePath(path), m_localBuffer(nullptr),
	m_Width(0), m_Height(0), m_BPP(0)
{
	stbi_set_flip_vertically_on_load(1);
	m_localBuffer = stbi_load(path.c_str(), &m_Width, &m_Height, &m_BPP, 4);

	GLCall(glGenTextures(1, &m_RendererID));
	GLCall(glBindTexture(GL_TEXTURE_2D, m_RendererID));

	GLCall(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER/*minification filter, how our parameter resampled down*/, GL_LINEAR));
	GLCall(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));//scale it up
	GLCall(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));//X GL_CLAMP
	GLCall(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));//Y

	GLCall(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, m_Width, m_Height, 0, GL_RGBA, GL_UNSIGNED_BYTE, m_localBuffer));
	GLCall(glBindTexture(GL_TEXTURE_2D, 0));

	if (m_localBuffer)
		stbi_image_free(m_localBuffer);
}

Texture::~Texture()
{
	GLCall(glDeleteTextures(1, &m_RendererID));
}

void Texture::Bind(unsigned int slot /*= 0*/) const
{
	GLCall(glActiveTexture(GL_TEXTURE0 + slot));
	GLCall(glBindTexture(GL_TEXTURE_2D, m_RendererID));
}

void Texture::Unbind() const
{
	GLCall(glBindTexture(GL_TEXTURE_2D, 0));
}

detail coming soon