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-rw-r--r--src/mesa/main/feedback.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/src/mesa/main/feedback.c b/src/mesa/main/feedback.c
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+++ b/src/mesa/main/feedback.c
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+/* $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;
+}
+
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