feedback.c File Reference

#include <assert.h>
#include <stdio.h>
#include "context.h"
#include "feedback.h"
#include "dlist.h"
#include "macros.h"
#include "types.h"

Include dependency graph for feedback.c:

Go to the source code of this file.

Macros
#define	FB_3D   0x01
#define	FB_4D   0x02
#define	FB_INDEX   0x04
#define	FB_COLOR   0x08
#define	FB_TEXTURE   0X10
#define	WRITE_RECORD(CTX, V)

Functions
void	gl_FeedbackBuffer (GLcontext *ctx, GLsizei size, GLenum type, GLfloat *buffer)
void	gl_PassThrough (GLcontext *ctx, GLfloat token)
void	gl_feedback_vertex (GLcontext *ctx, GLfloat x, GLfloat y, GLfloat z, GLfloat w, const GLfloat color[4], GLfloat index, const GLfloat texcoord[4])
void	gl_SelectBuffer (GLcontext *ctx, GLsizei size, GLuint *buffer)
void	gl_InitNames (GLcontext *ctx)
void	gl_update_hitflag (GLcontext *ctx, GLfloat z)
static void	write_hit_record (GLcontext *ctx)
void	gl_LoadName (GLcontext *ctx, GLuint name)
void	gl_PushName (GLcontext *ctx, GLuint name)
void	gl_PopName (GLcontext *ctx)
GLint	gl_RenderMode (GLcontext *ctx, GLenum mode)

Macro Definition Documentation

FB_3D

#define FB_3D   0x01

Definition at line 79 of file feedback.c.

FB_4D

#define FB_4D   0x02

Definition at line 80 of file feedback.c.

FB_COLOR

#define FB_COLOR   0x08

Definition at line 82 of file feedback.c.

FB_INDEX

#define FB_INDEX   0x04

Definition at line 81 of file feedback.c.

FB_TEXTURE

#define FB_TEXTURE   0X10

Definition at line 83 of file feedback.c.

WRITE_RECORD

#define WRITE_RECORD	(		CTX,
			V
	)

Value:

    if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
       CTX->Select.Buffer[CTX->Select.BufferCount] = (V);       \
    }                           \
    CTX->Select.BufferCount++;

Definition at line 232 of file feedback.c.

Function Documentation

gl_feedback_vertex()

void gl_feedback_vertex	(	GLcontext *	ctx,
		GLfloat	x,
		GLfloat	y,
		GLfloat	z,
		GLfloat	w,
		const GLfloat	color[4],
		GLfloat	index,
		const GLfloat	texcoord[4]
	)

Definition at line 161 of file feedback.c.

{
   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] );
   }
}

Referenced by drawpixels(), feedback_line(), feedback_points(), feedback_triangle(), gl_Bitmap(), and gl_CopyPixels().

gl_FeedbackBuffer()

void gl_FeedbackBuffer	(	GLcontext *	ctx,
		GLsizei	size,
		GLenum	type,
		GLfloat *	buffer
	)

Definition at line 88 of file feedback.c.

{
   if (ctx->RenderMode==GL_FEEDBACK || INSIDE_BEGIN_END(ctx)) {
      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;
}

Referenced by init_dlist_pointers(), and init_exec_pointers().

gl_InitNames()

void gl_InitNames

(

GLcontext *

ctx

)

Definition at line 219 of file feedback.c.

{
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "glInitNames" );
   }
   ctx->Select.NameStackDepth = 0;
   ctx->Select.HitFlag = GL_FALSE;
   ctx->Select.HitMinZ = 1.0;
   ctx->Select.HitMaxZ = 0.0;
}

Referenced by execute_list(), and init_exec_pointers().

gl_LoadName()

void gl_LoadName	(	GLcontext *	ctx,
		GLuint	name
	)

Definition at line 280 of file feedback.c.

{
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
      return;
   }
   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;
   }
}

Referenced by execute_list(), and init_exec_pointers().

gl_PassThrough()

void gl_PassThrough	(	GLcontext *	ctx,
		GLfloat	token
	)

Definition at line 143 of file feedback.c.

{
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "glPassThrough" );
      return;
   }
 
   if (ctx->RenderMode==GL_FEEDBACK) {
      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
      FEEDBACK_TOKEN( ctx, token );
   }
}

Referenced by execute_list(), and init_exec_pointers().

gl_PopName()

void gl_PopName

(

GLcontext *

ctx

)

Definition at line 327 of file feedback.c.

{
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "glPopName" );
      return;
   }
   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" );
   }
}

Referenced by execute_list(), and init_exec_pointers().

gl_PushName()

void gl_PushName	(	GLcontext *	ctx,
		GLuint	name
	)

Definition at line 305 of file feedback.c.

{
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "glPushName" );
      return;
   }
   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" );
   }
}

Referenced by execute_list(), and init_exec_pointers().

gl_RenderMode()

GLint gl_RenderMode	(	GLcontext *	ctx,
		GLenum	mode
	)

Definition at line 358 of file feedback.c.

{
   GLint result;
 
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
   }
 
   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:
     if (ctx->Select.BufferSize==0) {
        /* haven't called glSelectBuffer yet */
        gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
     }
     break;
      case GL_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;
}

Referenced by init_dlist_pointers(), and init_exec_pointers().

gl_SelectBuffer()

void gl_SelectBuffer	(	GLcontext *	ctx,
		GLsizei	size,
		GLuint *	buffer
	)

Definition at line 201 of file feedback.c.

{
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "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;
}

Referenced by init_dlist_pointers(), and init_exec_pointers().

gl_update_hitflag()

void gl_update_hitflag	(	GLcontext *	ctx,
		GLfloat	z
	)

Definition at line 240 of file feedback.c.

{
   ctx->Select.HitFlag = GL_TRUE;
   if (z < ctx->Select.HitMinZ) {
      ctx->Select.HitMinZ = z;
   }
   if (z > ctx->Select.HitMaxZ) {
      ctx->Select.HitMaxZ = z;
   }
}

Referenced by drawpixels(), gl_CopyPixels(), gl_RasterPos4f(), gl_windowpos(), select_line(), select_points(), and select_triangle().

write_hit_record()

static void write_hit_record ( GLcontext *  ctx )

static

Definition at line 253 of file feedback.c.

{
   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;
}

Referenced by gl_LoadName(), gl_PopName(), gl_PushName(), and gl_RenderMode().