237 lines
8.0 KiB
Java
237 lines
8.0 KiB
Java
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package com.chuangzhou.vivid2D.render;
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import com.chuangzhou.vivid2D.render.systems.RenderSystem;
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import com.chuangzhou.vivid2D.render.systems.buffer.BufferBuilder;
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import com.chuangzhou.vivid2D.render.systems.buffer.Tesselator;
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import com.chuangzhou.vivid2D.render.systems.sources.ShaderManagement;
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import com.chuangzhou.vivid2D.render.systems.sources.ShaderProgram;
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import org.joml.Vector2f;
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import org.joml.Vector4f;
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import org.lwjgl.opengl.*;
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import org.lwjgl.stb.STBTTAlignedQuad;
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import org.lwjgl.stb.STBTTBakedChar;
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import org.lwjgl.system.MemoryStack;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.nio.ByteBuffer;
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import static org.lwjgl.stb.STBTruetype.*;
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/**
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* OpenGL 文字渲染器实例类
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* 支持多字体、多实例管理，每个实例维护独立的字符数据与纹理
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*
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* @author tzdwindows 7
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*/
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public final class TextRenderer {
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private static final Logger logger = LoggerFactory.getLogger(TextRenderer.class);
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private final int bitmapWidth;
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private final int bitmapHeight;
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private final int firstChar;
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private final int charCount;
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private STBTTBakedChar.Buffer charData;
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private int fontTextureId;
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private boolean initialized = false;
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/**
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* 构造函数
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*
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* @param bitmapWidth 字符纹理宽度
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* @param bitmapHeight 字符纹理高度
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* @param firstChar 字符起始码
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* @param charCount 字符数量
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*/
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public TextRenderer(int bitmapWidth, int bitmapHeight, int firstChar, int charCount) {
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this.bitmapWidth = bitmapWidth;
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this.bitmapHeight = bitmapHeight;
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this.firstChar = firstChar;
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this.charCount = charCount;
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}
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/**
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* 初始化字体渲染器
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*
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* @param fontData TTF 字体文件内容
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* @param fontHeight 字体像素高度
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*/
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public void initialize(ByteBuffer fontData, float fontHeight) {
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if (initialized) return;
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ShaderProgram shader = ShaderManagement.getShaderProgram("TextShader");
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shader.use();
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// 验证输入参数
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if (fontData == null || fontData.capacity() == 0) {
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logger.error("Invalid font data provided to TextRenderer");
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return;
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}
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if (fontHeight <= 0) {
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logger.error("Invalid font height: {}", fontHeight);
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return;
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}
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if (bitmapWidth <= 0 || bitmapHeight <= 0) {
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logger.error("Invalid bitmap dimensions: {}x{}", bitmapWidth, bitmapHeight);
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return;
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}
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try {
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charData = STBTTBakedChar.malloc(charCount);
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// 分配位图内存
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int bitmapSize = bitmapWidth * bitmapHeight;
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if (bitmapSize <= 0) {
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logger.error("Invalid bitmap size: {}", bitmapSize);
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return;
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}
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ByteBuffer bitmap = ByteBuffer.allocateDirect(bitmapSize);
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// 烘焙字体位图
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int result = stbtt_BakeFontBitmap(fontData, fontHeight, bitmap, bitmapWidth, bitmapHeight, firstChar, charData);
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if (result <= 0) {
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logger.error("stbtt_BakeFontBitmap failed with result: {}", result);
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charData.free();
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return;
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}
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// 创建纹理
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fontTextureId = createTextureFromBitmap(bitmapWidth, bitmapHeight, bitmap);
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if (fontTextureId == 0) {
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logger.error("Failed to create font texture");
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charData.free();
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return;
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}
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initialized = true;
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logger.debug("TextRenderer initialized successfully with texture ID: {}", fontTextureId);
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} catch (Exception e) {
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logger.error("Exception during TextRenderer initialization: {}", e.getMessage());
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if (charData != null) {
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charData.free();
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charData = null;
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}
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}
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shader.stop();
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}
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private int createTextureFromBitmap(int width, int height, ByteBuffer pixels) {
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RenderSystem.assertOnRenderThread();
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int textureId = RenderSystem.genTextures();
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RenderSystem.bindTexture(textureId);
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// 使用更兼容的纹理格式
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RenderSystem.texImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_ALPHA,
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width, height, 0, GL11.GL_ALPHA, GL11.GL_UNSIGNED_BYTE, pixels);
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RenderSystem.setTextureMinFilter(GL11.GL_LINEAR);
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RenderSystem.setTextureMagFilter(GL11.GL_LINEAR);
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RenderSystem.setTextureWrapS(GL12.GL_CLAMP_TO_EDGE);
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RenderSystem.setTextureWrapT(GL12.GL_CLAMP_TO_EDGE);
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RenderSystem.bindTexture(0);
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return textureId;
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}
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/**
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* 渲染文字（使用 RenderSystem 封装，不使用 glBegin/glEnd）
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*
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* @param text 要显示的文字
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* @param x 世界坐标 X
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* @param y 世界坐标 Y
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* @param color 文字颜色
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*/
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public void renderText(String text, float x, float y, Vector4f color) {
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if (!initialized || text == null || text.isEmpty()) return;
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RenderSystem.assertOnRenderThread();
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// 保存当前状态
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RenderSystem.pushState();
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try {
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// 检查文本着色器是否存在，如果不存在则创建默认的
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ShaderProgram shader = ShaderManagement.getShaderProgram("TextShader");
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shader.use();
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ShaderManagement.setUniformVec4(shader, "uColor", color);
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ShaderManagement.setUniformInt(shader, "uTexture", 0);
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RenderSystem.enableBlend();
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RenderSystem.blendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
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RenderSystem.disableDepthTest();
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RenderSystem.activeTexture(GL13.GL_TEXTURE0);
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RenderSystem.bindTexture(fontTextureId);
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Vector2f offset = ModelRender.getCameraOffset();
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float px = x + offset.x;
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float py = y + offset.y;
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try (MemoryStack stack = MemoryStack.stackPush()) {
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STBTTAlignedQuad q = STBTTAlignedQuad.mallocStack(stack);
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float[] xpos = {px};
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float[] ypos = {py};
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Tesselator tesselator = Tesselator.getInstance();
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BufferBuilder builder = tesselator.getBuilder();
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// 计算估计的顶点数量：每个字符6个顶点（2个三角形）
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int estimatedVertexCount = text.length() * 6;
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// 修复：begin方法需要2个参数
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builder.begin(RenderSystem.DRAW_TRIANGLES, estimatedVertexCount);
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for (int i = 0; i < text.length(); i++) {
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char c = text.charAt(i);
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if (c < firstChar || c >= firstChar + charCount) continue;
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stbtt_GetBakedQuad(charData, bitmapWidth, bitmapHeight, c - firstChar, xpos, ypos, q, true);
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// 使用两个三角形组成一个四边形
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// 第一个三角形
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builder.vertex(q.x0(), q.y0(), q.s0(), q.t0());
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builder.vertex(q.x1(), q.y0(), q.s1(), q.t0());
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builder.vertex(q.x0(), q.y1(), q.s0(), q.t1());
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// 第二个三角形
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builder.vertex(q.x1(), q.y0(), q.s1(), q.t0());
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builder.vertex(q.x1(), q.y1(), q.s1(), q.t1());
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builder.vertex(q.x0(), q.y1(), q.s0(), q.t1());
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}
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tesselator.end();
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}
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RenderSystem.checkGLError("renderText");
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} finally {
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// 恢复之前的状态
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RenderSystem.popState();
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}
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}
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/**
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* 清理字体资源
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*/
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public void cleanup() {
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if (fontTextureId != 0) {
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RenderSystem.deleteTextures(fontTextureId);
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fontTextureId = 0;
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}
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if (charData != null) {
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charData.free();
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charData = null;
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}
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initialized = false;
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}
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public boolean isInitialized() {
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return initialized;
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}
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public int getFontTextureId() {
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return fontTextureId;
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}
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}
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