From b691c43c44ff180d10e7d4a9afc83b98551ff586 Mon Sep 17 00:00:00 2001
From: daoge_cmd <3523206925@qq.com>
Date: Sun, 1 Mar 2026 12:16:08 +0800
Subject: Initial commit

---
 Minecraft.Client/GuiComponent.cpp | 136 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 Minecraft.Client/GuiComponent.cpp

(limited to 'Minecraft.Client/GuiComponent.cpp')

diff --git a/Minecraft.Client/GuiComponent.cpp b/Minecraft.Client/GuiComponent.cpp
new file mode 100644
index 00000000..92abf36d
--- /dev/null
+++ b/Minecraft.Client/GuiComponent.cpp
@@ -0,0 +1,136 @@
+#include "stdafx.h"
+#include "GuiComponent.h"
+#include "Tesselator.h"
+
+void GuiComponent::hLine(int x0, int x1, int y, int col)
+{
+    if (x1 < x0)
+	{
+        int tmp = x0;
+        x0 = x1;
+        x1 = tmp;
+    }
+    fill(x0, y, x1 + 1, y + 1, col);
+}
+
+void GuiComponent::vLine(int x, int y0, int y1, int col)
+{
+    if (y1 < y0)
+	{
+        int tmp = y0;
+        y0 = y1;
+        y1 = tmp;
+    }
+    fill(x, y0 + 1, x + 1, y1, col);
+}
+
+void GuiComponent::fill(int x0, int y0, int x1, int y1, int col)
+{
+    if (x0 < x1)
+	{
+        int tmp = x0;
+        x0 = x1;
+        x1 = tmp;
+    }
+    if (y0 < y1)
+	{
+        int tmp = y0;
+        y0 = y1;
+        y1 = tmp;
+    }
+    float a = ((col >> 24) & 0xff) / 255.0f;
+    float r = ((col >> 16) & 0xff) / 255.0f;
+    float g = ((col >> 8) & 0xff) / 255.0f;
+    float b = ((col) & 0xff) / 255.0f;
+    Tesselator *t = Tesselator::getInstance();
+    glEnable(GL_BLEND);
+    glDisable(GL_TEXTURE_2D);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glColor4f(r, g, b, a);
+    t->begin();
+    t->vertex((float)(x0), (float)( y1), (float)( 0));
+    t->vertex((float)(x1), (float)( y1), (float)( 0));
+    t->vertex((float)(x1), (float)( y0), (float)( 0));
+    t->vertex((float)(x0), (float)( y0), (float)( 0));
+    t->end();
+    glEnable(GL_TEXTURE_2D);
+    glDisable(GL_BLEND);
+}
+
+void GuiComponent::fillGradient(int x0, int y0, int x1, int y1, int col1, int col2)
+{
+    float a1 = ((col1 >> 24) & 0xff) / 255.0f;
+    float r1 = ((col1 >> 16) & 0xff) / 255.0f;
+    float g1 = ((col1 >> 8) & 0xff) / 255.0f;
+    float b1 = ((col1) & 0xff) / 255.0f;
+
+    float a2 = ((col2 >> 24) & 0xff) / 255.0f;
+    float r2 = ((col2 >> 16) & 0xff) / 255.0f;
+    float g2 = ((col2 >> 8) & 0xff) / 255.0f;
+    float b2 = ((col2) & 0xff) / 255.0f;
+    glDisable(GL_TEXTURE_2D);
+    glEnable(GL_BLEND);
+    glDisable(GL_ALPHA_TEST);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glShadeModel(GL_SMOOTH);
+
+    Tesselator *t = Tesselator::getInstance();
+    t->begin();
+    t->color(r1, g1, b1, a1);
+    t->vertex((float)(x1), (float)( y0), blitOffset);
+    t->vertex((float)(x0), (float)( y0), blitOffset);
+    t->color(r2, g2, b2, a2);
+    t->vertex((float)(x0), (float)( y1), blitOffset);
+    t->vertex((float)(x1), (float)( y1), blitOffset);
+    t->end();
+
+    glShadeModel(GL_FLAT);
+    glDisable(GL_BLEND);
+    glEnable(GL_ALPHA_TEST);
+    glEnable(GL_TEXTURE_2D);
+}
+
+GuiComponent::GuiComponent()
+{
+	blitOffset = 0;
+}
+
+void GuiComponent::drawCenteredString(Font *font, const wstring& str, int x, int y, int color)
+{
+	font->drawShadow(str, x - (font->width(str)) / 2, y, color);
+}
+
+void GuiComponent::drawString(Font *font, const wstring& str, int x, int y, int color)
+{
+	font->drawShadow(str, x, y, color);
+}
+
+void GuiComponent::blit(int x, int y, int sx, int sy, int w, int h)
+{
+    float us = 1 / 256.0f;
+    float vs = 1 / 256.0f;
+    Tesselator *t = Tesselator::getInstance();
+    t->begin();
+
+	// This is a bit of a mystery. In general this ought to be 0.5 to match the centre of texels & pixels in the DX9 version of things. However, when scaling the GUI by a factor of 1.5, I'm
+	// really not sure how exactly point sampled rasterisation works, but when shifting by 0.5 we get a discontinuity down the diagonal of quads. Setting this shift to 0.75 in all cases seems to work fine.
+	const float extraShift = 0.75f;
+
+	// 4J - subtracting extraShift (actual screen pixels, so need to compensate for physical & game width) from each x & y coordinate to compensate for centre of pixels in directx vs openGL
+	float dx = ( extraShift * (float)Minecraft::GetInstance()->width ) / (float)Minecraft::GetInstance()->width_phys;
+	// 4J - Also factor in the scaling from gui coordinate space to the screen. This varies based on user-selected gui scale, and whether we are in a viewport mode or not
+	dx /= Gui::currentGuiScaleFactor;
+	float dy = extraShift / Gui::currentGuiScaleFactor;
+	// Ensure that the x/y, width and height are actually pixel aligned at our current scale factor - in particular, for split screen mode with the default (3X)
+	// scale, we have an overall scale factor of 3 * 0.5 = 1.5, and so any odd pixels won't align
+	float fx = (floorf((float)x * Gui::currentGuiScaleFactor)) / Gui::currentGuiScaleFactor;
+	float fy = (floorf((float)y * Gui::currentGuiScaleFactor)) / Gui::currentGuiScaleFactor;
+	float fw = (floorf((float)w * Gui::currentGuiScaleFactor)) / Gui::currentGuiScaleFactor;
+	float fh = (floorf((float)h * Gui::currentGuiScaleFactor)) / Gui::currentGuiScaleFactor;
+
+    t->vertexUV(fx + 0 - dx,  fy + fh - dy, (float)( blitOffset), (float)( (sx + 0) * us), (float)( (sy + h) * vs));
+    t->vertexUV(fx + fw - dx, fy + fh - dy, (float)( blitOffset), (float)( (sx + w) * us), (float)( (sy + h) * vs));
+    t->vertexUV(fx + fw - dx, fy + 0 - dy, (float)( blitOffset), (float)( (sx + w) * us), (float)( (sy + 0) * vs));
+    t->vertexUV(fx + 0 - dx,  fy + 0 - dy, (float)( blitOffset), (float)( (sx + 0) * us), (float)( (sy + 0) * vs));
+    t->end();
+}
\ No newline at end of file
-- 
cgit v1.2.3