-/* $Id: polygon.c,v 1.25 2002/10/24 23:57:21 brianp Exp $ */
+/**
+ * \file polygon.c
+ * Polygon operations.
+ */
/*
* Mesa 3-D graphics library
- * Version: 4.1
+ * Version: 6.3
*
- * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2004 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"),
#include "glheader.h"
#include "imports.h"
+#include "bufferobj.h"
#include "context.h"
#include "image.h"
#include "enums.h"
#include "mtypes.h"
-void
+/**
+ * Specify whether to cull front- or back-facing facets.
+ *
+ * \param mode culling mode.
+ *
+ * \sa glCullFace().
+ *
+ * Verifies the parameter and updates gl_polygon_attrib::CullFaceMode. On
+ * change, flushes the vertices and notifies the driver via
+ * the dd_function_table::CullFace callback.
+ */
+void GLAPIENTRY
_mesa_CullFace( GLenum mode )
{
GET_CURRENT_CONTEXT(ctx);
}
-
-void
+/**
+ * Define front- and back-facing
+ *
+ * \param mode orientation of front-facing polygons.
+ *
+ * \sa glFrontFace().
+ *
+ * Verifies the parameter and updates gl_polygon_attrib::FrontFace. On change
+ * flushes the vertices and notifies the driver via
+ * the dd_function_table::FrontFace callback.
+ */
+void GLAPIENTRY
_mesa_FrontFace( GLenum mode )
{
GET_CURRENT_CONTEXT(ctx);
}
-
-void
+/**
+ * Set the polygon rasterization mode.
+ *
+ * \param face the polygons which \p mode applies to.
+ * \param mode how polygons should be rasterized.
+ *
+ * \sa glPolygonMode().
+ *
+ * Verifies the parameters and updates gl_polygon_attrib::FrontMode and
+ * gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the
+ * driver via the dd_function_table::PolygonMode callback.
+ */
+void GLAPIENTRY
_mesa_PolygonMode( GLenum face, GLenum mode )
{
GET_CURRENT_CONTEXT(ctx);
}
}
+#if _HAVE_FULL_GL
+/**
+ * This routine updates the ctx->Polygon.Stipple state.
+ * If we're getting the stipple data from a PBO, we map the buffer
+ * in order to access the data.
+ * In any case, we obey the current pixel unpacking parameters when fetching
+ * the stipple data.
+ *
+ * In the future, this routine should be used as a fallback, called via
+ * ctx->Driver.PolygonStipple(). We'll have to update all the DRI drivers
+ * too.
+ */
void
+_mesa_polygon_stipple(GLcontext *ctx, const GLubyte *pattern)
+{
+ if (ctx->Unpack.BufferObj->Name) {
+ /* Get/unpack the stipple pattern from a PBO */
+ GLubyte *buf;
+ if (!_mesa_validate_pbo_access(2, &ctx->Unpack, 32, 32, 1,
+ GL_COLOR_INDEX, GL_BITMAP, pattern)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glPolygonStipple(bad PBO access)");
+ return;
+ }
+ buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
+ GL_READ_ONLY_ARB,
+ ctx->Unpack.BufferObj);
+ if (!buf) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glPolygonStipple(PBO mapped)");
+ return;
+ }
+ buf = ADD_POINTERS(buf, pattern);
+ _mesa_unpack_polygon_stipple(buf, ctx->PolygonStipple, &ctx->Unpack);
+ ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
+ ctx->Unpack.BufferObj);
+ }
+ else {
+ /* Get/unpack the stipple pattern from user memory */
+ _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
+ }
+}
+
+
+/**
+ * Called by glPolygonStipple.
+ */
+void GLAPIENTRY
_mesa_PolygonStipple( const GLubyte *pattern )
{
GET_CURRENT_CONTEXT(ctx);
_mesa_debug(ctx, "glPolygonStipple\n");
FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);
- _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
+
+ _mesa_polygon_stipple(ctx, pattern);
if (ctx->Driver.PolygonStipple)
- ctx->Driver.PolygonStipple( ctx, (const GLubyte *) ctx->PolygonStipple );
+ ctx->Driver.PolygonStipple(ctx, pattern);
}
-
-void
+/**
+ * Called by glPolygonStipple.
+ */
+void GLAPIENTRY
_mesa_GetPolygonStipple( GLubyte *dest )
{
GET_CURRENT_CONTEXT(ctx);
if (MESA_VERBOSE&VERBOSE_API)
_mesa_debug(ctx, "glGetPolygonStipple\n");
- _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
+ /* XXX someday we may put this code into a separate function and call
+ * it with ctx->Driver.GetPolygonStipple().
+ */
+ if (ctx->Pack.BufferObj->Name) {
+ /* Put/pack the stipple pattern into a PBO */
+ GLubyte *buf;
+ if (!_mesa_validate_pbo_access(2, &ctx->Pack, 32, 32, 1,
+ GL_COLOR_INDEX, GL_BITMAP, dest)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glGetPolygonStipple(bad PBO access)");
+ return;
+ }
+ buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+ GL_WRITE_ONLY_ARB,
+ ctx->Pack.BufferObj);
+ if (!buf) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glGetPolygonStipple(PBO mapped)");
+ return;
+ }
+ buf = ADD_POINTERS(buf, dest);
+ _mesa_pack_polygon_stipple(ctx->PolygonStipple, buf, &ctx->Pack);
+ ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+ ctx->Pack.BufferObj);
+ }
+ else {
+ /* Put/pack the stipple pattern into user memory */
+ _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
+ }
}
-
-void
+void GLAPIENTRY
_mesa_PolygonOffset( GLfloat factor, GLfloat units )
{
GET_CURRENT_CONTEXT(ctx);
}
-
-void
+void GLAPIENTRY
_mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
{
GET_CURRENT_CONTEXT(ctx);
- _mesa_PolygonOffset(factor, bias * ctx->DepthMaxF );
+ /* XXX mult by DepthMaxF here??? */
+ _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
+}
+
+#endif
+
+
+/**********************************************************************/
+/** \name State Management */
+/*@{*/
+
+/*
+ * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
+ * in ctx->_TriangleCaps if needed.
+ */
+void _mesa_update_polygon( GLcontext *ctx )
+{
+ ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
+
+ if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
+ ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
+
+ /* Any Polygon offsets enabled? */
+ if (ctx->Polygon.OffsetPoint ||
+ ctx->Polygon.OffsetLine ||
+ ctx->Polygon.OffsetFill) {
+ ctx->_TriangleCaps |= DD_TRI_OFFSET;
+ }
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Initialization */
+/*@{*/
+
+/**
+ * Initialize the context polygon state.
+ *
+ * \param ctx GL context.
+ *
+ * Initializes __GLcontextRec::Polygon and __GLcontextRec::PolygonStipple
+ * attribute groups.
+ */
+void _mesa_init_polygon( GLcontext * ctx )
+{
+ /* Polygon group */
+ ctx->Polygon.CullFlag = GL_FALSE;
+ ctx->Polygon.CullFaceMode = GL_BACK;
+ ctx->Polygon.FrontFace = GL_CCW;
+ ctx->Polygon._FrontBit = 0;
+ ctx->Polygon.FrontMode = GL_FILL;
+ ctx->Polygon.BackMode = GL_FILL;
+ ctx->Polygon.SmoothFlag = GL_FALSE;
+ ctx->Polygon.StippleFlag = GL_FALSE;
+ ctx->Polygon.OffsetFactor = 0.0F;
+ ctx->Polygon.OffsetUnits = 0.0F;
+ ctx->Polygon.OffsetPoint = GL_FALSE;
+ ctx->Polygon.OffsetLine = GL_FALSE;
+ ctx->Polygon.OffsetFill = GL_FALSE;
+
+
+ /* Polygon Stipple group */
+ MEMSET( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
}
+
+/*@}*/