[原创][Mod]基于opengl取色的hsv色盘屏幕
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直接上代码。
import com.mojang.blaze3d.systems.RenderSystem; import com.mojang.blaze3d.vertex.*; import net.minecraft.client.Minecraft; import net.minecraft.client.gui.GuiGraphics; import net.minecraft.client.gui.screens.Screen; import net.minecraft.client.renderer.GameRenderer; import net.minecraft.network.chat.Component; import net.minecraft.util.FastColor; import org.joml.Matrix4f; import org.lwjgl.BufferUtils; import org.lwjgl.opengl.GL11; import java.awt.*; import java.nio.ByteBuffer; public class ColorPickerScreen extends Screen { private int pickColor = 0xFFFFFFFF; private int hueColor = Color.HSBtoRGB(0f, 1f, 1f); private double pendingMouseX = -1, pendingMouseY = -1; // 色板与色相条的位置/尺寸常量 private static final int PANEL_X = 0, PANEL_Y = 0, PANEL_W = 200, PANEL_H = 100; private static final int HUE_X = 10, HUE_H = 20, HUE_W = 200, HUE_Y_OFFSET = 30; private static final int PREVIEW_X = 300, PREVIEW_Y = 0, PREVIEW_W = 50, PREVIEW_H = 50; private static final int HUE_SEGMENTS = 100; public ColorPickerScreen() { super(Component.literal("HSV Color Picker")); } @Override public void render(GuiGraphics guiGraphics, int mouseX, int mouseY, float partialTicks) { super.render(guiGraphics, mouseX, mouseY, partialTicks); Matrix4f mat = guiGraphics.pose().last().pose(); Tesselator tess = Tesselator.getInstance(); BufferBuilder buf = tess.getBuilder(); RenderSystem.setShader(GameRenderer::getPositionColorShader); buf.begin(VertexFormat.Mode.QUADS, DefaultVertexFormat.POSITION_COLOR); drawColorPanel(mat, buf); drawHueBar(mat, buf); drawPreview(mat, buf); tess.end(); // 在所有内容绘制完后再执行拾色 handlePendingPick(guiGraphics); } @Override public boolean mouseClicked(double mouseX, double mouseY, int button) { this.pendingMouseX = mouseX; this.pendingMouseY = mouseY; return super.mouseClicked(mouseX, mouseY, button); } // === 私有封装方法 === /** 绘制从黑→黑→选中色→白的渐变色板 */ private void drawColorPanel(Matrix4f mat, BufferBuilder buf) { buf.vertex(mat, PANEL_X, PANEL_Y + PANEL_H, 0).color(0f, 0f, 0f, 1f).endVertex(); buf.vertex(mat, PANEL_X + PANEL_W, PANEL_Y + PANEL_H, 0).color(0f, 0f, 0f, 1f).endVertex(); float rHue = FastColor.ARGB32.red(hueColor) / 255f; float gHue = FastColor.ARGB32.green(hueColor) / 255f; float bHue = FastColor.ARGB32.blue(hueColor) / 255f; buf.vertex(mat, PANEL_X + PANEL_W, PANEL_Y, 0).color(rHue, gHue, bHue, 1f).endVertex(); buf.vertex(mat, PANEL_X, PANEL_Y, 0).color(1f, 1f, 1f, 1f).endVertex(); } /** 绘制水平色相条 */ private void drawHueBar(Matrix4f mat, BufferBuilder buf) { int hueY = this.height - HUE_Y_OFFSET; for (int i = 0; i < HUE_SEGMENTS; i++) { float h1 = (float) i / HUE_SEGMENTS; float h2 = (float)(i + 1) / HUE_SEGMENTS; int c1 = Color.HSBtoRGB(h1, 1f, 1f); int c2 = Color.HSBtoRGB(h2, 1f, 1f); float r1 = ((c1>>16)&0xFF)/255f, g1 = ((c1>>8)&0xFF)/255f, b1 = (c1&0xFF)/255f; float r2 = ((c2>>16)&0xFF)/255f, g2 = ((c2>>8)&0xFF)/255f, b2 = (c2&0xFF)/255f; int x1 = HUE_X + i * HUE_W / HUE_SEGMENTS; int x2 = HUE_X + (i+1) * HUE_W / HUE_SEGMENTS; buf.vertex(mat, x1, hueY, 0).color(r1, g1, b1, 1f).endVertex(); buf.vertex(mat, x2, hueY, 0).color(r2, g2, b2, 1f).endVertex(); buf.vertex(mat, x2, hueY + HUE_H, 0).color(r2, g2, b2, 1f).endVertex(); buf.vertex(mat, x1, hueY + HUE_H, 0).color(r1, g1, b1, 1f).endVertex(); } } /** 在右侧绘制当前 pickColor 预览小矩形 */ private void drawPreview(Matrix4f mat, BufferBuilder buf) { float r = FastColor.ARGB32.red(pickColor) / 255f; float g = FastColor.ARGB32.green(pickColor) / 255f; float b = FastColor.ARGB32.blue(pickColor) / 255f; buf.vertex(mat, PREVIEW_X, PREVIEW_Y + PREVIEW_H, 0).color(r, g, b, 1f).endVertex(); buf.vertex(mat, PREVIEW_X + PREVIEW_W, PREVIEW_Y + PREVIEW_H, 0).color(r, g, b, 1f).endVertex(); buf.vertex(mat, PREVIEW_X + PREVIEW_W, PREVIEW_Y, 0).color(r, g, b, 1f).endVertex(); buf.vertex(mat, PREVIEW_X, PREVIEW_Y, 0).color(r, g, b, 1f).endVertex(); } /** 处理 pendingMouseX/Y，进行边界检查并调用 glReadPixels 拾色 */ private void handlePendingPick(GuiGraphics guiGraphics) { if (pendingMouseX < 0) return; // 边界判断：面板 或 色相条 boolean inPanel = pendingMouseX >= PANEL_X && pendingMouseX <= PANEL_X + PANEL_W && pendingMouseY >= PANEL_Y && pendingMouseY <= PANEL_Y + PANEL_H; int hueY = this.height - HUE_Y_OFFSET; boolean inHue = pendingMouseX >= HUE_X && pendingMouseX <= HUE_X + HUE_W && pendingMouseY >= hueY && pendingMouseY <= hueY + HUE_H; if (!inPanel && !inHue) { pendingMouseX = pendingMouseY = -1; return; } // 计算 OpenGL 像素坐标 double scale = Minecraft.getInstance().getWindow().getGuiScale(); if (scale < 1) scale = 1; int px = (int)(pendingMouseX * scale); int py = (int)(pendingMouseY * scale); int glY = Minecraft.getInstance().getWindow().getHeight() - py - 1; guiGraphics.flush(); ByteBuffer buf = BufferUtils.createByteBuffer(3); GL11.glReadPixels(px, glY, 1, 1, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, buf); int r = buf.get(0)&0xFF, g = buf.get(1)&0xFF, b = buf.get(2)&0xFF; if (inHue) { hueColor = FastColor.ARGB32.color(255, r, g, b); } else { pickColor = FastColor.ARGB32.color(255, r, g, b); } pendingMouseX = pendingMouseY = -1; } }具体的注释都在代码里面了，一些魔法数字我也写成了字段。
项目地址在我的github仓库， 都是LGPLv3的代码
