diff options
Diffstat (limited to 'src/mesa/main/feedback.c')
| -rw-r--r-- | src/mesa/main/feedback.c | 160 |
1 files changed, 143 insertions, 17 deletions
diff --git a/src/mesa/main/feedback.c b/src/mesa/main/feedback.c index 53c43cf3176..731fdf86bb8 100644 --- a/src/mesa/main/feedback.c +++ b/src/mesa/main/feedback.c @@ -1,3 +1,7 @@ +/** + * \file feedback.c + * Selection and feedback modes functions. + */ /* * Mesa 3-D graphics library @@ -33,6 +37,8 @@ #include "mtypes.h" +#if _HAVE_FULL_GL + #define FB_3D 0x01 #define FB_4D 0x02 @@ -145,14 +151,25 @@ void _mesa_feedback_vertex( GLcontext *ctx, } } - -/**********************************************************************/ -/* Selection */ -/**********************************************************************/ +#endif -/* - * NOTE: this function can't be put in a display list. +/**********************************************************************/ +/** \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 __GLcontextRec::Select with the given buffer. */ void _mesa_SelectBuffer( GLsizei size, GLuint *buffer ) @@ -165,7 +182,7 @@ _mesa_SelectBuffer( GLsizei size, GLuint *buffer ) return; /* KW: added return */ } - FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* why bother? */ + FLUSH_VERTICES(ctx, _NEW_RENDERMODE); ctx->Select.Buffer = buffer; ctx->Select.BufferSize = size; ctx->Select.BufferCount = 0; @@ -175,6 +192,15 @@ _mesa_SelectBuffer( GLsizei size, GLuint *buffer ) } +/** + * Write a value of a record into the selection buffer. + * + * \param CTX GL context. + * \param V value. + * + * Verifies there is free space in the buffer to write the value and + * increments the pointer. + */ #define WRITE_RECORD( CTX, V ) \ if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \ CTX->Select.Buffer[CTX->Select.BufferCount] = (V); \ @@ -182,7 +208,15 @@ _mesa_SelectBuffer( GLsizei size, GLuint *buffer ) 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( GLcontext *ctx, GLfloat z ) { ctx->Select.HitFlag = GL_TRUE; @@ -195,6 +229,17 @@ void _mesa_update_hitflag( GLcontext *ctx, GLfloat 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( GLcontext *ctx ) { GLuint i; @@ -221,7 +266,13 @@ static void write_hit_record( GLcontext *ctx ) } - +/** + * 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 + * __GLcontextRec::NewState. + */ void _mesa_InitNames( void ) { @@ -242,7 +293,17 @@ _mesa_InitNames( void ) } - +/** + * 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 __GLcontextRec::Select. + */ void _mesa_LoadName( GLuint name ) { @@ -271,6 +332,17 @@ _mesa_LoadName( GLuint 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 __GLcontextRec::Select. + */ void _mesa_PushName( GLuint name ) { @@ -293,7 +365,15 @@ _mesa_PushName( GLuint 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 __GLcontextRec::Select. + */ void _mesa_PopName( void ) { @@ -315,16 +395,27 @@ _mesa_PopName( void ) ctx->Select.NameStackDepth--; } +/*@}*/ /**********************************************************************/ -/* Render Mode */ -/**********************************************************************/ - +/** \name Render Mode */ +/*@{*/ - -/* - * NOTE: this function can't be put in a display list. +/** + * 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 + * __GLcontextRec::RenderMode and notifies the driver via the + * dd_function_table::RenderMode callback. */ GLint _mesa_RenderMode( GLenum mode ) @@ -360,6 +451,7 @@ _mesa_RenderMode( GLenum mode ) ctx->Select.Hits = 0; ctx->Select.NameStackDepth = 0; break; +#if _HAVE_FULL_GL case GL_FEEDBACK: if (ctx->Feedback.Count > ctx->Feedback.BufferSize) { /* overflow */ @@ -370,6 +462,7 @@ _mesa_RenderMode( GLenum mode ) } ctx->Feedback.Count = 0; break; +#endif default: _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" ); return 0; @@ -384,12 +477,14 @@ _mesa_RenderMode( GLenum mode ) _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" ); } break; +#if _HAVE_FULL_GL case GL_FEEDBACK: if (ctx->Feedback.BufferSize==0) { /* haven't called glFeedbackBuffer yet */ _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" ); } break; +#endif default: _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" ); return 0; @@ -401,3 +496,34 @@ _mesa_RenderMode( GLenum mode ) return result; } + +/*@}*/ + + +/**********************************************************************/ +/** \name Initialization */ +/*@{*/ + +/** + * Initialize context feedback data. + */ +void _mesa_init_feedback( GLcontext * 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; +} + +/*@}*/ |