Initial revision

1 files changed, 395 insertions, 0 deletions

diff --git a/src/mesa/main/feedback.c b/src/mesa/main/feedback.c
new file mode 100644
index 0000000000..4251aae01a
--- /dev/null
+++ b/src/mesa/main/feedback.c
@@ -0,0 +1,395 @@
+/* $Id: feedback.c,v 1.1 1999/08/19 00:55:41 jtg Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.1
+ * 
+ * Copyright (C) 1999  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.
+ */
+
+
+
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include <assert.h>
+#include <stdio.h>
+#include "context.h"
+#include "enums.h"
+#include "feedback.h"
+#include "macros.h"
+#include "types.h"
+#ifdef XFree86Server
+#include "GL/xf86glx.h"
+#endif
+#endif
+
+
+
+#define FB_3D		0x01
+#define FB_4D		0x02
+#define FB_INDEX	0x04
+#define FB_COLOR	0x08
+#define FB_TEXTURE	0X10
+
+
+
+void
+gl_FeedbackBuffer( GLcontext *ctx, GLsizei size, GLenum type, GLfloat *buffer )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glFeedbackBuffer" );
+
+   if (ctx->RenderMode==GL_FEEDBACK) {
+      gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
+      return;
+   }
+
+   if (size<0) {
+      gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
+      return;
+   }
+   if (!buffer) {
+      gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
+      ctx->Feedback.BufferSize = 0;
+      return;
+   }
+
+   switch (type) {
+      case GL_2D:
+	 ctx->Feedback.Mask = 0;
+         ctx->Feedback.Type = type;
+	 break;
+      case GL_3D:
+	 ctx->Feedback.Mask = FB_3D;
+         ctx->Feedback.Type = type;
+	 break;
+      case GL_3D_COLOR:
+	 ctx->Feedback.Mask = FB_3D
+                           | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX);
+         ctx->Feedback.Type = type;
+	 break;
+      case GL_3D_COLOR_TEXTURE:
+	 ctx->Feedback.Mask = FB_3D
+                           | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
+	                   | FB_TEXTURE;
+         ctx->Feedback.Type = type;
+	 break;
+      case GL_4D_COLOR_TEXTURE:
+	 ctx->Feedback.Mask = FB_3D | FB_4D
+                           | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
+	                   | FB_TEXTURE;
+         ctx->Feedback.Type = type;
+	 break;
+      default:
+	 ctx->Feedback.Mask = 0;
+         gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
+   }
+
+   ctx->Feedback.BufferSize = size;
+   ctx->Feedback.Buffer = buffer;
+   ctx->Feedback.Count = 0;
+}
+
+
+
+void gl_PassThrough( GLcontext *ctx, GLfloat token )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
+
+   if (ctx->RenderMode==GL_FEEDBACK) {
+      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
+      FEEDBACK_TOKEN( ctx, token );
+   }
+}
+
+
+
+/*
+ * Put a vertex into the feedback buffer.
+ */
+void gl_feedback_vertex( GLcontext *ctx,
+                         GLfloat x, GLfloat y, GLfloat z, GLfloat w,
+			 const GLfloat color[4], GLfloat index,
+			 const GLfloat texcoord[4] )
+{
+   FEEDBACK_TOKEN( ctx, x );
+   FEEDBACK_TOKEN( ctx, y );
+   if (ctx->Feedback.Mask & FB_3D) {
+      FEEDBACK_TOKEN( ctx, z );
+   }
+   if (ctx->Feedback.Mask & FB_4D) {
+      FEEDBACK_TOKEN( ctx, w );
+   }
+   if (ctx->Feedback.Mask & FB_INDEX) {
+      FEEDBACK_TOKEN( ctx, index );
+   }
+   if (ctx->Feedback.Mask & FB_COLOR) {
+      FEEDBACK_TOKEN( ctx, color[0] );
+      FEEDBACK_TOKEN( ctx, color[1] );
+      FEEDBACK_TOKEN( ctx, color[2] );
+      FEEDBACK_TOKEN( ctx, color[3] );
+   }
+   if (ctx->Feedback.Mask & FB_TEXTURE) {
+      FEEDBACK_TOKEN( ctx, texcoord[0] );
+      FEEDBACK_TOKEN( ctx, texcoord[1] );
+      FEEDBACK_TOKEN( ctx, texcoord[2] );
+      FEEDBACK_TOKEN( ctx, texcoord[3] );
+   }
+}
+
+
+
+/**********************************************************************/
+/*                              Selection                             */
+/**********************************************************************/
+
+
+/*
+ * NOTE: this function can't be put in a display list.
+ */
+void gl_SelectBuffer( GLcontext *ctx, GLsizei size, GLuint *buffer )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
+   if (ctx->RenderMode==GL_SELECT) {
+      gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
+   }
+   ctx->Select.Buffer = buffer;
+   ctx->Select.BufferSize = size;
+   ctx->Select.BufferCount = 0;
+
+   ctx->Select.HitFlag = GL_FALSE;
+   ctx->Select.HitMinZ = 1.0;
+   ctx->Select.HitMaxZ = 0.0;
+}
+
+
+#define WRITE_RECORD( CTX, V )					\
+	if (CTX->Select.BufferCount < CTX->Select.BufferSize) {	\
+	   CTX->Select.Buffer[CTX->Select.BufferCount] = (V);	\
+	}							\
+	CTX->Select.BufferCount++;
+
+
+
+void gl_update_hitflag( GLcontext *ctx, GLfloat z )
+{
+   ctx->Select.HitFlag = GL_TRUE;
+   if (z < ctx->Select.HitMinZ) {
+      ctx->Select.HitMinZ = z;
+   }
+   if (z > ctx->Select.HitMaxZ) {
+      ctx->Select.HitMaxZ = z;
+   }
+}
+
+
+
+static void write_hit_record( GLcontext *ctx )
+{
+   GLuint i;
+   GLuint zmin, zmax, zscale = (~0u);
+
+   /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
+   /* 2^32-1 and round to nearest unsigned integer. */
+
+   assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
+   zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
+   zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
+
+   WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
+   WRITE_RECORD( ctx, zmin );
+   WRITE_RECORD( ctx, zmax );
+   for (i=0;i<ctx->Select.NameStackDepth;i++) {
+      WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
+   }
+
+   ctx->Select.Hits++;
+   ctx->Select.HitFlag = GL_FALSE;
+   ctx->Select.HitMinZ = 1.0;
+   ctx->Select.HitMaxZ = -1.0;
+}
+
+
+
+void gl_InitNames( GLcontext *ctx )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
+   /* Record the hit before the HitFlag is wiped out again. */
+   if (ctx->RenderMode==GL_SELECT) {
+      if (ctx->Select.HitFlag) {
+         write_hit_record( ctx );
+      }
+   }
+   ctx->Select.NameStackDepth = 0;
+   ctx->Select.HitFlag = GL_FALSE;
+   ctx->Select.HitMinZ = 1.0;
+   ctx->Select.HitMaxZ = 0.0;
+}
+
+
+
+void gl_LoadName( GLcontext *ctx, GLuint name )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
+   if (ctx->RenderMode!=GL_SELECT) {
+      return;
+   }
+   if (ctx->Select.NameStackDepth==0) {
+      gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
+      return;
+   }
+   if (ctx->Select.HitFlag) {
+      write_hit_record( ctx );
+   }
+   if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
+      ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
+   }
+   else {
+      ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
+   }
+}
+
+
+void gl_PushName( GLcontext *ctx, GLuint name )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
+   if (ctx->RenderMode!=GL_SELECT) {
+      return;
+   }
+   if (ctx->Select.HitFlag) {
+      write_hit_record( ctx );
+   }
+   if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
+      ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
+   }
+   else {
+      gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
+   }
+}
+
+
+
+void gl_PopName( GLcontext *ctx )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
+   if (ctx->RenderMode!=GL_SELECT) {
+      return;
+   }
+   if (ctx->Select.HitFlag) {
+      write_hit_record( ctx );
+   }
+   if (ctx->Select.NameStackDepth>0) {
+      ctx->Select.NameStackDepth--;
+   }
+   else {
+      gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
+   }
+}
+
+
+
+/**********************************************************************/
+/*                           Render Mode                              */
+/**********************************************************************/
+
+
+
+/*
+ * NOTE: this function can't be put in a display list.
+ */
+GLint gl_RenderMode( GLcontext *ctx, GLenum mode )
+{
+   GLint result;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
+
+   ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
+
+   switch (ctx->RenderMode) {
+      case GL_RENDER:
+	 result = 0;
+	 break;
+      case GL_SELECT:
+	 if (ctx->Select.HitFlag) {
+	    write_hit_record( ctx );
+	 }
+	 if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
+	    /* overflow */
+#ifdef DEBUG
+            gl_warning(ctx, "Feedback buffer overflow");
+#endif
+	    result = -1;
+	 }
+	 else {
+	    result = ctx->Select.Hits;
+	 }
+	 ctx->Select.BufferCount = 0;
+	 ctx->Select.Hits = 0;
+	 ctx->Select.NameStackDepth = 0;
+	 break;
+      case GL_FEEDBACK:
+	 if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
+	    /* overflow */
+	    result = -1;
+	 }
+	 else {
+	    result = ctx->Feedback.Count;
+	 }
+	 ctx->Feedback.Count = 0;
+	 break;
+      default:
+	 gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
+	 return 0;
+   }
+
+   switch (mode) {
+      case GL_RENDER:
+         break;
+      case GL_SELECT:
+	 ctx->TriangleCaps |= DD_SELECT;
+	 if (ctx->Select.BufferSize==0) {
+	    /* haven't called glSelectBuffer yet */
+	    gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
+	 }
+	 break;
+      case GL_FEEDBACK:
+	 ctx->TriangleCaps |= DD_FEEDBACK;
+	 if (ctx->Feedback.BufferSize==0) {
+	    /* haven't called glFeedbackBuffer yet */
+	    gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
+	 }
+	 break;
+      default:
+	 gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
+	 return 0;
+   }
+
+
+   ctx->RenderMode = mode;
+   ctx->NewState |= NEW_ALL;
+
+   return result;
+}
+