LibGL: Implement glColorMask

Author: https://github.com/Quaker762 Commit: 8157e7740b Pull-request: https://github.com/SerenityOS/serenity/pull/9381 Reviewed-by: https://github.com/sunverwerth ✅
2025-08-08 09:09:43 +00:00 · 2021-08-13 22:03:39 +10:00 · 2021-08-13 22:03:39 +10:00 · 8157e7740b · 2024-07-18 05:39:04 +09:00
commit 8157e7740b
parent fa8e9cb683
7 changed files with 41 additions and 3 deletions
--- a/Userland/Libraries/LibGL/SoftwareRasterizer.cpp
+++ b/Userland/Libraries/LibGL/SoftwareRasterizer.cpp
@ -383,7 +383,7 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
                            + float_dst * dst_factor_dst_color
                            + FloatVector4(float_dst.w(), float_dst.w(), float_dst.w(), float_dst.w()) * dst_factor_dst_alpha;

-                        *dst = to_rgba32(*src * src_factor + float_dst * dst_factor);
+                        *dst = (*dst & ~options.color_mask) | (to_rgba32(*src * src_factor + float_dst * dst_factor) & options.color_mask);
                    }
                }
            } else {
@ -395,7 +395,7 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
                        if (~pixel_mask[y] & (1 << x))
                            continue;

-                        *dst = to_rgba32(*src);
+                        *dst = (*dst & ~options.color_mask) | (to_rgba32(*src) & options.color_mask);
                    }
                }
            }