| /* |
| * 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 "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 |
| |
| |
| |
| 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; /* Because 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 ); |
| } |
| } |
| |
| |
| /** |
| * 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] ); |
| } |
| } |
| |
| |
| /**********************************************************************/ |
| /** \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; |
| } |
| |
| 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. */ |
| |
| 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; |
| } |
| |
| |
| /** |
| * 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; |
| } |
| |
| |
| /** |
| * 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; |
| } |
| |
| FLUSH_VERTICES(ctx, _NEW_RENDERMODE); |
| |
| 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; |
| } |
| } |
| |
| |
| /** |
| * 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); |
| |
| if (ctx->RenderMode != GL_SELECT) { |
| return; |
| } |
| |
| 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; |
| } |
| |
| 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--; |
| } |
| |
| /*@}*/ |
| |
| |
| /**********************************************************************/ |
| /** \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_enum_to_string(mode)); |
| |
| FLUSH_VERTICES(ctx, _NEW_RENDERMODE); |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| /*@}*/ |
| |
| |
| /**********************************************************************/ |
| /** \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; |
| } |
| |
| /*@}*/ |