From f5a7cb71fd17d5eb97ce3325892a2c769258c8ce Mon Sep 17 00:00:00 2001
From: Arisotura <thetotalworm@gmail.com>
Date: Sat, 18 May 2019 01:42:50 +0200
Subject: also, do master brightness

---
 src/libui_sdl/main.cpp       |  4 ++--
 src/libui_sdl/main_shaders.h | 24 +++++++++++++++++++++++-
 2 files changed, 25 insertions(+), 3 deletions(-)

(limited to 'src/libui_sdl')

diff --git a/src/libui_sdl/main.cpp b/src/libui_sdl/main.cpp
index f4a1fdb..27f0369 100644
--- a/src/libui_sdl/main.cpp
+++ b/src/libui_sdl/main.cpp
@@ -367,9 +367,9 @@ void GLDrawing_DrawScreen()
                     GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][0]);
     glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 768, 256<<ScreenScale[1], 192<<ScreenScale[1], GL_RGBA_INTEGER,
                     GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][1]);*/
-    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256*3 + 1, 192, GL_RGBA_INTEGER,
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256*3 + 2, 192, GL_RGBA_INTEGER,
                     GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][0]);
-    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 768, 256*3 + 1, 192, GL_RGBA_INTEGER,
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 768, 256*3 + 2, 192, GL_RGBA_INTEGER,
                     GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][1]);
 
     glActiveTexture(GL_TEXTURE1);
diff --git a/src/libui_sdl/main_shaders.h b/src/libui_sdl/main_shaders.h
index 5c9095e..d6d898d 100644
--- a/src/libui_sdl/main_shaders.h
+++ b/src/libui_sdl/main_shaders.h
@@ -65,13 +65,14 @@ out vec4 oColor;
 void main()
 {
     ivec4 pixel = ivec4(texelFetch(ScreenTex, ivec2(fTexcoord), 0));
-ivec4 zog=pixel;
+
     // bit0-13: BLDCNT
     // bit14-15: DISPCNT display mode
     // bit16-20: EVA
     // bit21-25: EVB
     // bit26-30: EVY
     ivec4 ctl = ivec4(texelFetch(ScreenTex, ivec2(256*3, int(fTexcoord.y)), 0));
+    ivec4 mbright = ivec4(texelFetch(ScreenTex, ivec2(256*3 + 1, int(fTexcoord.y)), 0));
     int dispmode = (ctl.g >> 6) & 0x3;
 
     if (dispmode == 1)
@@ -182,6 +183,27 @@ ivec4 zog=pixel;
         }
     }
 
+    if (dispmode != 0)
+    {
+        int brightmode = mbright.g >> 6;
+        if (brightmode == 1)
+        {
+            // up
+            int evy = mbright.r & 0x1F;
+            if (evy > 16) evy = 16;
+
+            pixel += ((ivec4(0x3F,0x3F,0x3F,0) - pixel) * evy) >> 4;
+        }
+        else if (brightmode == 2)
+        {
+            // down
+            int evy = mbright.r & 0x1F;
+            if (evy > 16) evy = 16;
+
+            pixel -= (pixel * evy) >> 4;
+        }
+    }
+
     pixel.rgb <<= 2;
     pixel.rgb |= (pixel.rgb >> 6);
 
-- 
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