From 2702c90d7a39fca2a3319c5e915fd290cb31fc70 Mon Sep 17 00:00:00 2001
From: Radosław Kujawa <radoslaw.kujawa@c0ff33.net>
Date: Fri, 17 Jul 2026 14:54:32 +0200
Subject: Initial import.

---
 src/mesa/swrast/s_logic.c | 497 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 497 insertions(+)
 create mode 100644 src/mesa/swrast/s_logic.c

(limited to 'src/mesa/swrast/s_logic.c')

diff --git a/src/mesa/swrast/s_logic.c b/src/mesa/swrast/s_logic.c
new file mode 100644
index 0000000..ad27cb7
--- /dev/null
+++ b/src/mesa/swrast/s_logic.c
@@ -0,0 +1,497 @@
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  4.1
+ *
+ * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+#include "glheader.h"
+#include "context.h"
+#include "imports.h"
+#include "macros.h"
+
+#include "s_alphabuf.h"
+#include "s_context.h"
+#include "s_logic.h"
+#include "s_span.h"
+
+
+
+/*
+ * Apply logic op to array of CI pixels.
+ */
+static void
+index_logicop( GLcontext *ctx, GLuint n, GLuint index[], const GLuint dest[],
+               const GLubyte mask[] )
+{
+   GLuint i;
+   switch (ctx->Color.LogicOp) {
+      case GL_CLEAR:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = 0;
+	    }
+	 }
+	 break;
+      case GL_SET:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = ~0;
+	    }
+	 }
+	 break;
+      case GL_COPY:
+	 /* do nothing */
+	 break;
+      case GL_COPY_INVERTED:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = ~index[i];
+	    }
+	 }
+	 break;
+      case GL_NOOP:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = dest[i];
+	    }
+	 }
+	 break;
+      case GL_INVERT:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = ~dest[i];
+	    }
+	 }
+	 break;
+      case GL_AND:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] &= dest[i];
+	    }
+	 }
+	 break;
+      case GL_NAND:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = ~(index[i] & dest[i]);
+	    }
+	 }
+	 break;
+      case GL_OR:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] |= dest[i];
+	    }
+	 }
+	 break;
+      case GL_NOR:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = ~(index[i] | dest[i]);
+	    }
+	 }
+	 break;
+      case GL_XOR:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] ^= dest[i];
+	    }
+	 }
+	 break;
+      case GL_EQUIV:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = ~(index[i] ^ dest[i]);
+	    }
+	 }
+	 break;
+      case GL_AND_REVERSE:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = index[i] & ~dest[i];
+	    }
+	 }
+	 break;
+      case GL_AND_INVERTED:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = ~index[i] & dest[i];
+	    }
+	 }
+	 break;
+      case GL_OR_REVERSE:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = index[i] | ~dest[i];
+	    }
+	 }
+	 break;
+      case GL_OR_INVERTED:
+         for (i=0;i<n;i++) {
+	    if (mask[i]) {
+	       index[i] = ~index[i] | dest[i];
+	    }
+	 }
+	 break;
+      default:
+	 _mesa_problem(ctx, "bad mode in index_logic()");
+   }
+}
+
+
+
+/*
+ * Apply the current logic operator to a span of CI pixels.  This is only
+ * used if the device driver can't do logic ops.
+ */
+void
+_swrast_logicop_ci_span( GLcontext *ctx, const struct sw_span *span,
+                       GLuint index[] )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   GLuint dest[MAX_WIDTH];
+
+   ASSERT(span->end < MAX_WIDTH);
+
+   /* Read dest values from frame buffer */
+   if (span->arrayMask & SPAN_XY) {
+      (*swrast->Driver.ReadCI32Pixels)( ctx, span->end,
+                                        span->array->x, span->array->y,
+                                        dest, span->array->mask );
+   }
+   else {
+      (*swrast->Driver.ReadCI32Span)( ctx, span->end, span->x, span->y, dest );
+   }
+
+   index_logicop( ctx, span->end, index, dest, span->array->mask );
+}
+
+
+
+/*
+ * Apply logic operator to rgba pixels.
+ * Input:  ctx - the context
+ *         n - number of pixels
+ *         mask - pixel mask array
+ * In/Out:  src - incoming pixels which will be modified
+ * Input:  dest - frame buffer values
+ *
+ * Note:  Since the R, G, B, and A channels are all treated the same we
+ * process them as 4-byte GLuints instead of four GLubytes.
+ */
+static void
+rgba_logicop_ui( const GLcontext *ctx, GLuint n, const GLubyte mask[],
+                 GLuint src[], const GLuint dest[] )
+{
+   GLuint i;
+   switch (ctx->Color.LogicOp) {
+      case GL_CLEAR:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = 0;
+            }
+         }
+         break;
+      case GL_SET:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~0;
+            }
+         }
+         break;
+      case GL_COPY:
+         /* do nothing */
+         break;
+      case GL_COPY_INVERTED:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~src[i];
+            }
+         }
+         break;
+      case GL_NOOP:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = dest[i];
+            }
+         }
+         break;
+      case GL_INVERT:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~dest[i];
+            }
+         }
+         break;
+      case GL_AND:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] &= dest[i];
+            }
+         }
+         break;
+      case GL_NAND:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~(src[i] & dest[i]);
+            }
+         }
+         break;
+      case GL_OR:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i]|= dest[i];
+            }
+         }
+         break;
+      case GL_NOR:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~(src[i] | dest[i]);
+            }
+         }
+         break;
+      case GL_XOR:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] ^= dest[i];
+            }
+         }
+         break;
+      case GL_EQUIV:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~(src[i] ^ dest[i]);
+            }
+         }
+         break;
+      case GL_AND_REVERSE:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = src[i] & ~dest[i];
+            }
+         }
+         break;
+      case GL_AND_INVERTED:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~src[i] & dest[i];
+            }
+         }
+         break;
+      case GL_OR_REVERSE:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = src[i] | ~dest[i];
+            }
+         }
+         break;
+      case GL_OR_INVERTED:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~src[i] | dest[i];
+            }
+         }
+         break;
+      default:
+         /* should never happen */
+         _mesa_problem(ctx, "Bad function in rgba_logicop");
+   }
+}
+
+
+/*
+ * As above, but operate on GLchan values
+ * Note: need to pass n = numPixels * 4.
+ */
+static void
+rgba_logicop_chan( const GLcontext *ctx, GLuint n, const GLubyte mask[],
+                   GLchan srcPtr[], const GLchan destPtr[] )
+{
+#if CHAN_TYPE == GL_FLOAT
+   GLuint *src = (GLuint *) srcPtr;
+   const GLuint *dest = (const GLuint *) destPtr;
+   GLuint i;
+   ASSERT(sizeof(GLfloat) == sizeof(GLuint));
+#else
+   GLchan *src = srcPtr;
+   const GLchan *dest = destPtr;
+   GLuint i;
+#endif
+
+   switch (ctx->Color.LogicOp) {
+      case GL_CLEAR:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = 0;
+            }
+         }
+         break;
+      case GL_SET:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~0;
+            }
+         }
+         break;
+      case GL_COPY:
+         /* do nothing */
+         break;
+      case GL_COPY_INVERTED:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~src[i];
+            }
+         }
+         break;
+      case GL_NOOP:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = dest[i];
+            }
+         }
+         break;
+      case GL_INVERT:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~dest[i];
+            }
+         }
+         break;
+      case GL_AND:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] &= dest[i];
+            }
+         }
+         break;
+      case GL_NAND:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~(src[i] & dest[i]);
+            }
+         }
+         break;
+      case GL_OR:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i]|= dest[i];
+            }
+         }
+         break;
+      case GL_NOR:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~(src[i] | dest[i]);
+            }
+         }
+         break;
+      case GL_XOR:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] ^= dest[i];
+            }
+         }
+         break;
+      case GL_EQUIV:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~(src[i] ^ dest[i]);
+            }
+         }
+         break;
+      case GL_AND_REVERSE:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = src[i] & ~dest[i];
+            }
+         }
+         break;
+      case GL_AND_INVERTED:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~src[i] & dest[i];
+            }
+         }
+         break;
+      case GL_OR_REVERSE:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = src[i] | ~dest[i];
+            }
+         }
+         break;
+      case GL_OR_INVERTED:
+         for (i=0;i<n;i++) {
+            if (mask[i]) {
+               src[i] = ~src[i] | dest[i];
+            }
+         }
+         break;
+      default:
+         /* should never happen */
+         _mesa_problem(ctx, "Bad function in rgba_logicop");
+   }
+}
+
+
+
+/*
+ * Apply the current logic operator to a span of RGBA pixels.
+ * We can handle horizontal runs of pixels (spans) or arrays of x/y
+ * pixel coordinates.
+ */
+void
+_swrast_logicop_rgba_span( GLcontext *ctx, const struct sw_span *span,
+                         GLchan rgba[][4] )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   GLchan dest[MAX_WIDTH][4];
+
+   ASSERT(span->end < MAX_WIDTH);
+   ASSERT(span->arrayMask & SPAN_RGBA);
+
+   if (span->arrayMask & SPAN_XY) {
+      (*swrast->Driver.ReadRGBAPixels)(ctx, span->end,
+                                       span->array->x, span->array->y,
+                                       dest, span->array->mask);
+      if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) {
+         _swrast_read_alpha_pixels(ctx, span->end,
+                                 span->array->x, span->array->y,
+                                 dest, span->array->mask);
+      }
+   }
+   else {
+      _swrast_read_rgba_span(ctx, ctx->DrawBuffer, span->end,
+                           span->x, span->y, dest);
+   }
+
+   if (sizeof(GLchan) * 4 == sizeof(GLuint)) {
+      rgba_logicop_ui(ctx, span->end, span->array->mask,
+                      (GLuint *) rgba, (const GLuint *) dest);
+   }
+   else {
+      rgba_logicop_chan(ctx, 4 * span->end, span->array->mask,
+                        (GLchan *) rgba, (const GLchan *) dest);
+   }
+}
-- 
cgit