0,0 → 1,516 |
/* |
* Mesa 3-D graphics library |
* |
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved. |
* Copyright (C) 2009 VMware, Inc. 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 |
* THE AUTHORS OR COPYRIGHT HOLDERS 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. |
*/ |
|
/** |
* \file feedback.c |
* Selection and feedback modes functions. |
*/ |
|
|
#include "glheader.h" |
#include "colormac.h" |
#include "context.h" |
#include "enums.h" |
#include "feedback.h" |
#include "macros.h" |
#include "mtypes.h" |
#include "main/dispatch.h" |
|
|
#define FB_3D 0x01 |
#define FB_4D 0x02 |
#define FB_COLOR 0x04 |
#define FB_TEXTURE 0X08 |
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void GLAPIENTRY |
_mesa_FeedbackBuffer( GLsizei size, GLenum type, GLfloat *buffer ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (ctx->RenderMode==GL_FEEDBACK) { |
_mesa_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" ); |
return; |
} |
if (size<0) { |
_mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" ); |
return; |
} |
if (!buffer && size > 0) { |
_mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" ); |
ctx->Feedback.BufferSize = 0; |
return; |
} |
|
switch (type) { |
case GL_2D: |
ctx->Feedback._Mask = 0; |
break; |
case GL_3D: |
ctx->Feedback._Mask = FB_3D; |
break; |
case GL_3D_COLOR: |
ctx->Feedback._Mask = (FB_3D | FB_COLOR); |
break; |
case GL_3D_COLOR_TEXTURE: |
ctx->Feedback._Mask = (FB_3D | FB_COLOR | FB_TEXTURE); |
break; |
case GL_4D_COLOR_TEXTURE: |
ctx->Feedback._Mask = (FB_3D | FB_4D | FB_COLOR | FB_TEXTURE); |
break; |
default: |
_mesa_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" ); |
return; |
} |
|
FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* Always flush */ |
ctx->Feedback.Type = type; |
ctx->Feedback.BufferSize = size; |
ctx->Feedback.Buffer = buffer; |
ctx->Feedback.Count = 0; /* Becaues of this. */ |
} |
|
|
void GLAPIENTRY |
_mesa_PassThrough( GLfloat token ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (ctx->RenderMode==GL_FEEDBACK) { |
FLUSH_VERTICES(ctx, 0); |
_mesa_feedback_token( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN ); |
_mesa_feedback_token( ctx, token ); |
} |
} |
|
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/** |
* Put a vertex into the feedback buffer. |
*/ |
void |
_mesa_feedback_vertex(struct gl_context *ctx, |
const GLfloat win[4], |
const GLfloat color[4], |
const GLfloat texcoord[4]) |
{ |
_mesa_feedback_token( ctx, win[0] ); |
_mesa_feedback_token( ctx, win[1] ); |
if (ctx->Feedback._Mask & FB_3D) { |
_mesa_feedback_token( ctx, win[2] ); |
} |
if (ctx->Feedback._Mask & FB_4D) { |
_mesa_feedback_token( ctx, win[3] ); |
} |
if (ctx->Feedback._Mask & FB_COLOR) { |
_mesa_feedback_token( ctx, color[0] ); |
_mesa_feedback_token( ctx, color[1] ); |
_mesa_feedback_token( ctx, color[2] ); |
_mesa_feedback_token( ctx, color[3] ); |
} |
if (ctx->Feedback._Mask & FB_TEXTURE) { |
_mesa_feedback_token( ctx, texcoord[0] ); |
_mesa_feedback_token( ctx, texcoord[1] ); |
_mesa_feedback_token( ctx, texcoord[2] ); |
_mesa_feedback_token( ctx, texcoord[3] ); |
} |
} |
|
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/**********************************************************************/ |
/** \name Selection */ |
/*@{*/ |
|
/** |
* Establish a buffer for selection mode values. |
* |
* \param size buffer size. |
* \param buffer buffer. |
* |
* \sa glSelectBuffer(). |
* |
* \note this function can't be put in a display list. |
* |
* Verifies we're not in selection mode, flushes the vertices and initialize |
* the fields in __struct gl_contextRec::Select with the given buffer. |
*/ |
void GLAPIENTRY |
_mesa_SelectBuffer( GLsizei size, GLuint *buffer ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (size < 0) { |
_mesa_error(ctx, GL_INVALID_VALUE, "glSelectBuffer(size)"); |
return; |
} |
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if (ctx->RenderMode==GL_SELECT) { |
_mesa_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" ); |
return; /* KW: added return */ |
} |
|
FLUSH_VERTICES(ctx, _NEW_RENDERMODE); |
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; |
} |
|
|
/** |
* Write a value of a record into the selection buffer. |
* |
* \param ctx GL context. |
* \param value value. |
* |
* Verifies there is free space in the buffer to write the value and |
* increments the pointer. |
*/ |
static inline void |
write_record(struct gl_context *ctx, GLuint value) |
{ |
if (ctx->Select.BufferCount < ctx->Select.BufferSize) { |
ctx->Select.Buffer[ctx->Select.BufferCount] = value; |
} |
ctx->Select.BufferCount++; |
} |
|
|
/** |
* Update the hit flag and the maximum and minimum depth values. |
* |
* \param ctx GL context. |
* \param z depth. |
* |
* Sets gl_selection::HitFlag and updates gl_selection::HitMinZ and |
* gl_selection::HitMaxZ. |
*/ |
void |
_mesa_update_hitflag(struct gl_context *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; |
} |
} |
|
|
/** |
* Write the hit record. |
* |
* \param ctx GL context. |
* |
* Write the hit record, i.e., the number of names in the stack, the minimum and |
* maximum depth values and the number of names in the name stack at the time |
* of the event. Resets the hit flag. |
* |
* \sa gl_selection. |
*/ |
static void |
write_hit_record(struct gl_context *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. */ |
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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; |
} |
|
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/** |
* Initialize the name stack. |
* |
* Verifies we are in select mode and resets the name stack depth and resets |
* the hit record data in gl_selection. Marks new render mode in |
* __struct gl_contextRec::NewState. |
*/ |
void GLAPIENTRY |
_mesa_InitNames( void ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
FLUSH_VERTICES(ctx, 0); |
|
/* 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; |
ctx->NewState |= _NEW_RENDERMODE; |
} |
|
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/** |
* Load the top-most name of the name stack. |
* |
* \param name name. |
* |
* Verifies we are in selection mode and that the name stack is not empty. |
* Flushes vertices. If there is a hit flag writes it (via write_hit_record()), |
* and replace the top-most name in the stack. |
* |
* sa __struct gl_contextRec::Select. |
*/ |
void GLAPIENTRY |
_mesa_LoadName( GLuint name ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (ctx->RenderMode != GL_SELECT) { |
return; |
} |
if (ctx->Select.NameStackDepth == 0) { |
_mesa_error( ctx, GL_INVALID_OPERATION, "glLoadName" ); |
return; |
} |
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FLUSH_VERTICES(ctx, _NEW_RENDERMODE); |
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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; |
} |
} |
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/** |
* Push a name into the name stack. |
* |
* \param name name. |
* |
* Verifies we are in selection mode and that the name stack is not full. |
* Flushes vertices. If there is a hit flag writes it (via write_hit_record()), |
* and adds the name to the top of the name stack. |
* |
* sa __struct gl_contextRec::Select. |
*/ |
void GLAPIENTRY |
_mesa_PushName( GLuint name ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
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if (ctx->RenderMode != GL_SELECT) { |
return; |
} |
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FLUSH_VERTICES(ctx, _NEW_RENDERMODE); |
if (ctx->Select.HitFlag) { |
write_hit_record( ctx ); |
} |
if (ctx->Select.NameStackDepth >= MAX_NAME_STACK_DEPTH) { |
_mesa_error( ctx, GL_STACK_OVERFLOW, "glPushName" ); |
} |
else |
ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name; |
} |
|
|
/** |
* Pop a name into the name stack. |
* |
* Verifies we are in selection mode and that the name stack is not empty. |
* Flushes vertices. If there is a hit flag writes it (via write_hit_record()), |
* and removes top-most name in the name stack. |
* |
* sa __struct gl_contextRec::Select. |
*/ |
void GLAPIENTRY |
_mesa_PopName( void ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (ctx->RenderMode != GL_SELECT) { |
return; |
} |
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FLUSH_VERTICES(ctx, _NEW_RENDERMODE); |
if (ctx->Select.HitFlag) { |
write_hit_record( ctx ); |
} |
if (ctx->Select.NameStackDepth == 0) { |
_mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopName" ); |
} |
else |
ctx->Select.NameStackDepth--; |
} |
|
/*@}*/ |
|
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/**********************************************************************/ |
/** \name Render Mode */ |
/*@{*/ |
|
/** |
* Set rasterization mode. |
* |
* \param mode rasterization mode. |
* |
* \note this function can't be put in a display list. |
* |
* \sa glRenderMode(). |
* |
* Flushes the vertices and do the necessary cleanup according to the previous |
* rasterization mode, such as writing the hit record or resent the select |
* buffer index when exiting the select mode. Updates |
* __struct gl_contextRec::RenderMode and notifies the driver via the |
* dd_function_table::RenderMode callback. |
*/ |
GLint GLAPIENTRY |
_mesa_RenderMode( GLenum mode ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
GLint result; |
ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0); |
|
if (MESA_VERBOSE & VERBOSE_API) |
_mesa_debug(ctx, "glRenderMode %s\n", _mesa_lookup_enum_by_nr(mode)); |
|
FLUSH_VERTICES(ctx, _NEW_RENDERMODE); |
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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 |
_mesa_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: |
_mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" ); |
return 0; |
} |
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switch (mode) { |
case GL_RENDER: |
break; |
case GL_SELECT: |
if (ctx->Select.BufferSize==0) { |
/* haven't called glSelectBuffer yet */ |
_mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" ); |
} |
break; |
case GL_FEEDBACK: |
if (ctx->Feedback.BufferSize==0) { |
/* haven't called glFeedbackBuffer yet */ |
_mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" ); |
} |
break; |
default: |
_mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" ); |
return 0; |
} |
|
ctx->RenderMode = mode; |
if (ctx->Driver.RenderMode) |
ctx->Driver.RenderMode( ctx, mode ); |
|
return result; |
} |
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/*@}*/ |
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/**********************************************************************/ |
/** \name Initialization */ |
/*@{*/ |
|
/** |
* Initialize context feedback data. |
*/ |
void _mesa_init_feedback( struct gl_context * ctx ) |
{ |
/* Feedback */ |
ctx->Feedback.Type = GL_2D; /* TODO: verify */ |
ctx->Feedback.Buffer = NULL; |
ctx->Feedback.BufferSize = 0; |
ctx->Feedback.Count = 0; |
|
/* Selection/picking */ |
ctx->Select.Buffer = NULL; |
ctx->Select.BufferSize = 0; |
ctx->Select.BufferCount = 0; |
ctx->Select.Hits = 0; |
ctx->Select.NameStackDepth = 0; |
|
/* Miscellaneous */ |
ctx->RenderMode = GL_RENDER; |
} |
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/*@}*/ |