Hazel游戏引擎（068）创建一个纹理SheetAPI

企业开发 2023-08-01 17:49:50 阅读次数: 0

文中若有代码、术语等错误，欢迎指正

文章目录

前言

  • 此节所做

    由067节写的代码，写死在cpp文件中，为此需要抽象纹理SheetAPI。

  • 如何抽象SheetAPI

    • 具体怎么实现和抽象根据自己的需要

    • Cherno采用的思路是

      • 为一张Texture Sheet，根据输入xy、大小参数返回子纹理。

      • 子纹理的属性有：Texture（即一张的大的Texture Sheet）指针、glm::vec2 的纹理坐标

        Texture是指针，不是每一个子纹理都有一个指针指向父纹理。

        扫描二维码关注公众号，回复： 15998256 查看本文章

代码流程

  1. 加载Texture sheet纹理集

    // 加载Texture sheet
m_SpriteSheet = Hazel::Texture2D::Create("assets/games/textures/RPGpack_sheet_2X.png");

  2. 由纹理集对象创建子纹理

    //m_TextureStairs, m_TextureTree, m_TextureBush
m_TextureStair = Hazel::SubTexture2D::CreateFromCoords(m_SpriteSheet, {
      
       7, 6 }, {
      
      128, 128});
m_TextureBush = Hazel::SubTexture2D::CreateFromCoords(m_SpriteSheet, {
      
       2, 3 }, {
      
       128, 128 });
m_TextureTree = Hazel::SubTexture2D::CreateFromCoords(m_SpriteSheet, {
      
       4, 1 }, {
      
       128, 128 }, {
      
       1,2 });

    /
// 为一张Texture Sheet，根据输入**xy**、**大小**参数返回子纹理。
Ref<SubTexture2D> Hazel::SubTexture2D::CreateFromCoords(const Ref<Texture2D>& texture, const glm::vec2& coords, const glm::vec2& cellSize, const glm::vec2& spriteSize)
{
      
      
    glm::vec2 min = {
      
       (coords.x * cellSize.x) / texture->GetWidth(),  (coords.y * cellSize.y) / texture->GetHeight() };
    glm::vec2 max = {
      
       ((coords.x + spriteSize.x) * cellSize.x) / texture->GetWidth(),  ((coords.y + spriteSize.y) * cellSize.y) / texture->GetHeight() };
    return CreateRef<SubTexture2D>(texture, min, max);
}

  3. 将根据获取的子纹理的属性赋予顶点属性上传到OpenGL着色器上渲染

    Hazel::Renderer2D::BeginScene(m_CameraController.GetCamera());
// 获取的子纹理有m_TextureBush、m_TextureStair、m_TextureTree
Hazel::Renderer2D::DrawQuad({
      
       0.0f, 0.0f, 0.9f }, {
      
       1.0f, 1.0f }, m_TextureBush, 1.0f);
Hazel::Renderer2D::DrawQuad({
      
       1.0f, 0.0f, 0.9f }, {
      
       1.0f, 1.0f }, m_TextureStair, 1.0f);
Hazel::Renderer2D::DrawQuad({
      
       -1.0f, 0.0f, 0.9f }, {
      
       1.0f, 2.0f }, m_TextureTree, 1.0f);
Hazel::Renderer2D::EndScene();

    void Renderer2D::DrawQuad(const glm::vec3& position, const glm::vec2& size, const Ref<SubTexture2D>& subtexture, float tilingFactor, const glm::vec4& tintColor)
{
      
      
    HZ_PROFILE_FUNCTION();

    constexpr glm::vec4 color = {
      
       1.0f, 1.0f, 1.0f, 1.0f };
    /
    // 根据子纹理对象获取属性：纹理坐标、所属的纹理集对象
    const glm::vec2* textureCoords = subtexture->GetTexCoords();
    const Ref<Texture2D> texture = subtexture->GetTexture();
  .....
    // quad的左下角为起点
    s_Data.QuadVertexBufferPtr->Position = tranform * s_Data.QuadVertexPosition[0];
    s_Data.QuadVertexBufferPtr->Color = color;
    s_Data.QuadVertexBufferPtr->TexCoord = textureCoords[0];// 子纹理坐标赋予到顶点属性纹理坐标中
    s_Data.QuadVertexBufferPtr->TexIndex = textureIndex;	// 纹理集在纹理数组的位置
    s_Data.QuadVertexBufferPtr->TilingFactor = tilingFactor;
    s_Data.QuadVertexBufferPtr++;
   ......
    s_Data.Stats.QuadCount++;
}

结果

请添加图片描述

完整代码

  • SubTexture2D

    #pragma once

#include "Texture.h"
#include <glm/glm.hpp>
namespace Hazel {
      
      
	class SubTexture2D
	{
      
      
	public:
		SubTexture2D(const Ref<Texture2D>& texture, const glm::vec2& min, const glm::vec2& max);

		const Ref<Texture2D> GetTexture()const {
      
       return m_Texture; }
		const glm::vec2* GetTexCoords() const {
      
       return m_TextCoords; }

		static Ref<SubTexture2D> CreateFromCoords(const Ref<Texture2D>& texture, const glm::vec2& coords, const glm::vec2& cellSize, const glm::vec2& spriteSize = {
      
      1, 1});
	private:
		Ref<Texture2D> m_Texture;

		glm::vec2 m_TextCoords[4];
	};
}

    #include "hzpch.h"
#include "SubTexture2D.h"

namespace Hazel {
      
      
	// 只需要min和max二个二维向量可以组合成4个点
	Hazel::SubTexture2D::SubTexture2D(const Ref<Texture2D>& texture, const glm::vec2& min, const glm::vec2& max)
		:m_Texture(texture)
	{
      
      
		m_TextCoords[0] = {
      
       min.x, min.y };
		m_TextCoords[1] = {
      
       max.x, min.y };
		m_TextCoords[2] = {
      
       max.x, max.y };
		m_TextCoords[3] = {
      
       min.x, max.y };
	}

	Ref<SubTexture2D> Hazel::SubTexture2D::CreateFromCoords(const Ref<Texture2D>& texture, const glm::vec2& coords, const glm::vec2& cellSize, const glm::vec2& spriteSize)
	{
      
      
		glm::vec2 min = {
      
       (coords.x * cellSize.x) / texture->GetWidth(),  (coords.y * cellSize.y) / texture->GetHeight() };
		glm::vec2 max = {
      
       ((coords.x + spriteSize.x) * cellSize.x) / texture->GetWidth(),  ((coords.y + spriteSize.y) * cellSize.y) / texture->GetHeight() };
		return CreateRef<SubTexture2D>(texture, min, max);
	}
}

  • Renderer2D.cpp

    void Renderer2D::DrawQuad(const glm::vec3& position, const glm::vec2& size, const Ref<SubTexture2D>& subtexture, float tilingFactor, const glm::vec4& tintColor)
{
      
      
    HZ_PROFILE_FUNCTION();

    constexpr glm::vec4 color = {
      
       1.0f, 1.0f, 1.0f, 1.0f };
    const glm::vec2* textureCoords = subtexture->GetTexCoords();
    const Ref<Texture2D> texture = subtexture->GetTexture();

    if (s_Data.QuadIndexCount >= Renderer2DData::MaxIndices) {
      
      
        FlushAndReset();
    }

    float textureIndex = 0.0f;
    for (uint32_t i = 1; i < s_Data.TextureSlotIndex; i++)
    {
      
      
        // 当前纹理，如果已经存储在纹理槽，就直接读取
        if (*s_Data.TextureSlots[i].get() == *texture.get()) {
      
      
            textureIndex = (float)i;
            break;
        }
    }
    if (textureIndex == 0.0f) {
      
      
        textureIndex = (float)s_Data.TextureSlotIndex;
        s_Data.TextureSlots[s_Data.TextureSlotIndex] = texture;
        s_Data.TextureSlotIndex++;// 记得++
    }
    // 设置transform
    glm::mat4 tranform = glm::translate(glm::mat4(1.0f), position) *
        glm::scale(glm::mat4(1.0f), {
      
       size.x, size.y, 1.0f });

    // quad的左下角为起点
    s_Data.QuadVertexBufferPtr->Position = tranform * s_Data.QuadVertexPosition[0];
    s_Data.QuadVertexBufferPtr->Color = color;
    s_Data.QuadVertexBufferPtr->TexCoord = textureCoords[0];
    s_Data.QuadVertexBufferPtr->TexIndex = textureIndex;
    s_Data.QuadVertexBufferPtr->TilingFactor = tilingFactor;
    s_Data.QuadVertexBufferPtr++;

    s_Data.QuadVertexBufferPtr->Position = tranform * s_Data.QuadVertexPosition[1];
    s_Data.QuadVertexBufferPtr->Color = color;
    s_Data.QuadVertexBufferPtr->TexCoord = textureCoords[1];
    s_Data.QuadVertexBufferPtr->TexIndex = textureIndex;
    s_Data.QuadVertexBufferPtr->TilingFactor = tilingFactor;
    s_Data.QuadVertexBufferPtr++;

    s_Data.QuadVertexBufferPtr->Position = tranform * s_Data.QuadVertexPosition[2];
    s_Data.QuadVertexBufferPtr->Color = color;
    s_Data.QuadVertexBufferPtr->TexCoord = textureCoords[2];
    s_Data.QuadVertexBufferPtr->TexIndex = textureIndex;
    s_Data.QuadVertexBufferPtr->TilingFactor = tilingFactor;
    s_Data.QuadVertexBufferPtr++;

    s_Data.QuadVertexBufferPtr->Position = tranform * s_Data.QuadVertexPosition[3];
    s_Data.QuadVertexBufferPtr->Color = color;
    s_Data.QuadVertexBufferPtr->TexCoord = textureCoords[3];
    s_Data.QuadVertexBufferPtr->TexIndex = textureIndex;
    s_Data.QuadVertexBufferPtr->TilingFactor = tilingFactor;
    s_Data.QuadVertexBufferPtr++;

    s_Data.QuadIndexCount += 6;// 每一个quad用6个索引

    s_Data.Stats.QuadCount++;
}

  • Sandbox2D.cpp

    void Sandbox2D::OnAttach()
{
      
      
	HZ_PROFILE_FUNCTION();

	//Hazel::Renderer2D::Init();
	m_SquareTexture = Hazel::Texture2D::Create("assets/textures/Checkerboard.png");
	// 加载Texture sheet
	m_SpriteSheet = Hazel::Texture2D::Create("assets/games/textures/RPGpack_sheet_2X.png");
	//m_TextureStairs, m_TextureTree, m_TextureBush
	m_TextureStair = Hazel::SubTexture2D::CreateFromCoords(m_SpriteSheet, {
      
       7, 6 }, {
      
      128, 128});
	m_TextureBush = Hazel::SubTexture2D::CreateFromCoords(m_SpriteSheet, {
      
       2, 3 }, {
      
       128, 128 });
	m_TextureTree = Hazel::SubTexture2D::CreateFromCoords(m_SpriteSheet, {
      
       4, 1 }, {
      
       128, 128 }, {
      
       1,2 });
	// Init here
	m_Particle.ColorBegin = {
      
       254 / 255.0f, 212 / 255.0f, 123 / 255.0f, 1.0f };
.....
}


OnUpdate()
// 绘制纹理集的一个
Hazel::Renderer2D::BeginScene(m_CameraController.GetCamera());
Hazel::Renderer2D::DrawQuad({
      
       0.0f, 0.0f, 0.9f }, {
      
       1.0f, 1.0f }, m_TextureBush, 1.0f);
Hazel::Renderer2D::DrawQuad({
      
       1.0f, 0.0f, 0.9f }, {
      
       1.0f, 1.0f }, m_TextureStair, 1.0f);
Hazel::Renderer2D::DrawQuad({
      
       -1.0f, 0.0f, 0.9f }, {
      
       1.0f, 2.0f }, m_TextureTree, 1.0f);
Hazel::Renderer2D::EndScene();

猜你喜欢

转载自blog.csdn.net/qq_34060370/article/details/132013330
今日推荐
TIOBE 5 月榜单：Fortran “复活”进入 Top 10
GCC 14.1 发布
面壁智能发布 Eurux-8x22B 开源大模型 —— 堪称「理科状元」
开源日报 | 谷歌扶持鸿蒙上位；开源Rabbit R1；Docker加持的安卓手机；微软的焦虑和野心；海尔电器把开放平台关了
中国码农的“35岁魔咒”
蘭雅 CorelDRAW 插件 2024.5.1 国际劳动节版，免费下载
Arc Browser for Windows 1.0 正式 GA
90后程序员开发视频搬运软件、不到一年获利超 700 万，结局很刑！
周排行
Java自定义时间格式
同步整形电路
在开发中最最最常用的字符串的属性大集合
Linux 查看端口占用并杀掉
Java基础四：ArrayList
多线程之死锁就是这么简单
mysql 基础命令集
awk 命令详解
Centos6.3编译安装nginx+php步骤
OCR （Optical Character Recognition，光学字符识别）
每日归档
更多
2024-05-08(42)
2024-05-07(14)
2024-05-06(40)
2024-05-05(0)
2024-05-04(7)
2024-05-03(19)
2024-05-02(0)
2024-05-01(4)
2024-04-30(1)
2024-04-29(40)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022