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- /* $Id: feedback.c,v 1.5 1999/11/08 07:36:44 brianp 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
- #ifndef XFree86Server
- #include <assert.h>
- #include <stdio.h>
- #else
- #include "GL/xf86glx.h"
- #endif
- #include "context.h"
- #include "enums.h"
- #include "feedback.h"
- #include "macros.h"
- #include "mmath.h"
- #include "types.h"
- #include "triangle.h"
- #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,
- const GLfloat win[4],
- const GLfloat color[4],
- GLuint index,
- const GLfloat texcoord[4] )
- {
- FEEDBACK_TOKEN( ctx, win[0] );
- FEEDBACK_TOKEN( ctx, win[1] );
- if (ctx->Feedback.Mask & FB_3D) {
- FEEDBACK_TOKEN( ctx, win[2] );
- }
- if (ctx->Feedback.Mask & FB_4D) {
- FEEDBACK_TOKEN( ctx, win[3] );
- }
- if (ctx->Feedback.Mask & FB_INDEX) {
- FEEDBACK_TOKEN( ctx, (GLfloat) 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] );
- }
- }
-
-
-
- static void gl_do_feedback_vertex( GLcontext *ctx, GLuint v, GLuint pv )
- {
- GLfloat win[4];
- GLfloat color[4];
- GLfloat tc[4];
- GLuint texUnit = ctx->Texture.CurrentTransformUnit;
- struct vertex_buffer *VB = ctx->VB;
-
- win[0] = VB->Win.data[v][0];
- win[1] = VB->Win.data[v][1];
- win[2] = VB->Win.data[v][2] / DEPTH_SCALE;
- win[3] = 1.0 / VB->Win.data[v][3];
-
- if (ctx->Light.ShadeModel==GL_SMOOTH) pv = v;
-
- UBYTE_RGBA_TO_FLOAT_RGBA( color, VB->ColorPtr->data[pv] );
-
- if (VB->TexCoordPtr[texUnit]->size == 4 &&
- VB->TexCoordPtr[texUnit]->data[v][3]!=0.0)
- {
- GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
- tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
- tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
- tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
- tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
- } else {
- ASSIGN_4V(tc, 0,0,0,1);
- COPY_SZ_4V(tc,
- VB->TexCoordPtr[texUnit]->size,
- VB->TexCoordPtr[texUnit]->data[v]);
- }
-
- gl_feedback_vertex( ctx, win, color, VB->IndexPtr->data[v], tc );
- }
-
-
-
- /*
- * Put triangle in feedback buffer.
- */
- void gl_feedback_triangle( GLcontext *ctx,
- GLuint v0, GLuint v1, GLuint v2, GLuint pv )
- {
- if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
- FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
- FEEDBACK_TOKEN( ctx, (GLfloat) 3 ); /* three vertices */
-
- gl_do_feedback_vertex( ctx, v0, pv );
- gl_do_feedback_vertex( ctx, v1, pv );
- gl_do_feedback_vertex( ctx, v2, pv );
- }
- }
-
-
- void gl_feedback_line( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv )
- {
- GLenum token = GL_LINE_TOKEN;
-
- if (ctx->StippleCounter==0)
- token = GL_LINE_RESET_TOKEN;
-
- FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
-
- gl_do_feedback_vertex( ctx, v1, pv );
- gl_do_feedback_vertex( ctx, v2, pv );
-
- ctx->StippleCounter++;
- }
-
-
- void gl_feedback_points( GLcontext *ctx, GLuint first, GLuint last )
- {
- struct vertex_buffer *VB = ctx->VB;
- GLuint i;
-
- for (i=first;i<=last;i++)
- if (VB->ClipMask[i]==0) {
- FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
- gl_do_feedback_vertex( ctx, i, i );
- }
- }
-
-
-
-
-
- /**********************************************************************/
- /* 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;
- }
- }
-
- void gl_select_triangle( GLcontext *ctx,
- GLuint v0, GLuint v1, GLuint v2, GLuint pv )
- {
- struct vertex_buffer *VB = ctx->VB;
-
- if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
- gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
- gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
- gl_update_hitflag( ctx, VB->Win.data[v2][3] / DEPTH_SCALE );
- }
- }
-
-
- void gl_select_line( GLcontext *ctx,
- GLuint v0, GLuint v1, GLuint pv )
- {
- struct vertex_buffer *VB = ctx->VB;
-
- gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
- gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
- }
-
- void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
- {
- struct vertex_buffer *VB = ctx->VB;
- GLuint i;
-
- for (i=first;i<=last;i++)
- if (VB->ClipMask[i]==0)
- gl_update_hitflag( ctx, VB->Win.data[i][3] / DEPTH_SCALE);
- }
-
-
- 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;
- }
-
-