From a9e34c68ac0538699a144f67d3ce83ccb8f49be9 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Wed, 12 Jan 2005 04:01:08 +0000
Subject: Some initial work for OpenGL 2.0: glStencilFunc/Op/MaskSeparate()
 functions.

---
 src/mesa/main/stencil.c | 174 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 172 insertions(+), 2 deletions(-)

(limited to 'src/mesa/main/stencil.c')

diff --git a/src/mesa/main/stencil.c b/src/mesa/main/stencil.c
index 8c89e8cc13..dfda4aa8fd 100644
--- a/src/mesa/main/stencil.c
+++ b/src/mesa/main/stencil.c
@@ -5,9 +5,9 @@
 
 /*
  * Mesa 3-D graphics library
- * Version:  4.1
+ * Version:  6.3
  *
- * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2005  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"),
@@ -244,6 +244,7 @@ _mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass)
 }
 
 
+
 #if _HAVE_FULL_GL
 /* GL_EXT_stencil_two_side */
 void GLAPIENTRY
@@ -264,6 +265,175 @@ _mesa_ActiveStencilFaceEXT(GLenum face)
 #endif
 
 
+
+/**
+ * OpenGL 2.0 function.
+ * \todo Make StencilOp() call this function.  And eventually remove the
+ * ctx->Driver.StencilOp function and use ctx->Driver.StencilOpSeparate
+ * instead.
+ */
+void GLAPIENTRY
+_mesa_StencilOpSeparate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(face)");
+      return;
+   }
+
+   switch (fail) {
+      case GL_KEEP:
+      case GL_ZERO:
+      case GL_REPLACE:
+      case GL_INCR:
+      case GL_DECR:
+      case GL_INVERT:
+         break;
+      case GL_INCR_WRAP_EXT:
+      case GL_DECR_WRAP_EXT:
+         if (ctx->Extensions.EXT_stencil_wrap) {
+            break;
+         }
+         /* FALL-THROUGH */
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(fail)");
+         return;
+   }
+   switch (zfail) {
+      case GL_KEEP:
+      case GL_ZERO:
+      case GL_REPLACE:
+      case GL_INCR:
+      case GL_DECR:
+      case GL_INVERT:
+         break;
+      case GL_INCR_WRAP_EXT:
+      case GL_DECR_WRAP_EXT:
+         if (ctx->Extensions.EXT_stencil_wrap) {
+            break;
+         }
+         /* FALL-THROUGH */
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(zfail)");
+         return;
+   }
+   switch (zpass) {
+      case GL_KEEP:
+      case GL_ZERO:
+      case GL_REPLACE:
+      case GL_INCR:
+      case GL_DECR:
+      case GL_INVERT:
+         break;
+      case GL_INCR_WRAP_EXT:
+      case GL_DECR_WRAP_EXT:
+         if (ctx->Extensions.EXT_stencil_wrap) {
+            break;
+         }
+         /* FALL-THROUGH */
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(zpass)");
+         return;
+   }
+
+   FLUSH_VERTICES(ctx, _NEW_STENCIL);
+
+   if (face == GL_FRONT || face == GL_FRONT_AND_BACK) {
+      ctx->Stencil.FailFunc[0] = fail;
+      ctx->Stencil.ZFailFunc[0] = zfail;
+      ctx->Stencil.ZPassFunc[0] = zpass;
+   }
+   if (face == GL_BACK || face == GL_FRONT_AND_BACK) {
+      ctx->Stencil.FailFunc[1] = fail;
+      ctx->Stencil.ZFailFunc[1] = zfail;
+      ctx->Stencil.ZPassFunc[1] = zpass;
+   }
+
+   if (ctx->Driver.StencilOpSeparate) {
+      ctx->Driver.StencilOpSeparate(ctx, face, fail, zfail, zpass);
+   }
+}
+
+
+/* OpenGL 2.0 */
+void GLAPIENTRY
+_mesa_StencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   GLint maxref;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFuncSeparate(face)");
+      return;
+   }
+
+   switch (func) {
+      case GL_NEVER:
+      case GL_LESS:
+      case GL_LEQUAL:
+      case GL_GREATER:
+      case GL_GEQUAL:
+      case GL_EQUAL:
+      case GL_NOTEQUAL:
+      case GL_ALWAYS:
+         break;
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFuncSeparate(func)");
+         return;
+   }
+
+   maxref = (1 << STENCIL_BITS) - 1;
+   ref = (GLstencil) CLAMP(ref, 0, maxref);
+
+   FLUSH_VERTICES(ctx, _NEW_STENCIL);
+
+   if (face == GL_FRONT || face == GL_FRONT_AND_BACK) {
+      ctx->Stencil.Function[0] = func;
+      ctx->Stencil.Ref[0] = ref;
+      ctx->Stencil.ValueMask[0] = (GLstencil) mask;
+   }
+   if (face == GL_BACK || face == GL_FRONT_AND_BACK) {
+      ctx->Stencil.Function[1] = func;
+      ctx->Stencil.Ref[1] = ref;
+      ctx->Stencil.ValueMask[1] = (GLstencil) mask;
+   }
+
+   if (ctx->Driver.StencilFuncSeparate) {
+      ctx->Driver.StencilFuncSeparate(ctx, face, func, ref, mask);
+   }
+}
+
+
+/* OpenGL 2.0 */
+void GLAPIENTRY
+_mesa_StencilMaskSeparate(GLenum face, GLuint mask)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilaMaskSeparate(face)");
+      return;
+   }
+
+   FLUSH_VERTICES(ctx, _NEW_STENCIL);
+
+   if (face == GL_FRONT || face == GL_FRONT_AND_BACK) {
+      ctx->Stencil.WriteMask[0] = (GLstencil) mask;
+   }
+   if (face == GL_BACK || face == GL_FRONT_AND_BACK) {
+      ctx->Stencil.WriteMask[1] = (GLstencil) mask;
+   }
+
+   if (ctx->Driver.StencilMaskSeparate) {
+      ctx->Driver.StencilMaskSeparate(ctx, face, mask);
+   }
+}
+
+
 /**
  * Initialize the context stipple state.
  *
-- 
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