xref: /xsrc/external/mit/MesaLib/dist/src/glx/vertarr.c

/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, 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 including the dates of first publication and
 * either this permission notice or a reference to
 * http://oss.sgi.com/projects/FreeB/
 * 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
 * SILICON GRAPHICS, INC. 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.
 *
 * Except as contained in this notice, the name of Silicon Graphics, Inc.
 * shall not be used in advertising or otherwise to promote the sale, use or
 * other dealings in this Software without prior written authorization from
 * Silicon Graphics, Inc.
 */

#include "glxclient.h"
#include "indirect.h"
#include "indirect_vertex_array.h"


/*****************************************************************************/

/**
 * \name Vertex array pointer bridge functions
 *
 * When EXT_vertex_array was moved into the core GL spec, the \c count
 * parameter was lost.  This libGL really only wants to implement the GL 1.1
 * version, but we need to support applications that were written to the old
 * interface.  These bridge functions are part of the glue that makes this
 * happen.
 */
/*@{*/
void
__indirect_glColorPointerEXT(GLint size, GLenum type, GLsizei stride,
                             GLsizei count, const GLvoid * pointer)
{
   (void) count;
   __indirect_glColorPointer(size, type, stride, pointer);
}

void
__indirect_glEdgeFlagPointerEXT(GLsizei stride,
                                GLsizei count, const GLboolean * pointer)
{
   (void) count;
   __indirect_glEdgeFlagPointer(stride, pointer);
}

void
__indirect_glIndexPointerEXT(GLenum type, GLsizei stride,
                             GLsizei count, const GLvoid * pointer)
{
   (void) count;
   __indirect_glIndexPointer(type, stride, pointer);
}

void
__indirect_glNormalPointerEXT(GLenum type, GLsizei stride, GLsizei count,
                              const GLvoid * pointer)
{
   (void) count;
   __indirect_glNormalPointer(type, stride, pointer);
}

void
__indirect_glTexCoordPointerEXT(GLint size, GLenum type, GLsizei stride,
                                GLsizei count, const GLvoid * pointer)
{
   (void) count;
   __indirect_glTexCoordPointer(size, type, stride, pointer);
}

void
__indirect_glVertexPointerEXT(GLint size, GLenum type, GLsizei stride,
                              GLsizei count, const GLvoid * pointer)
{
   (void) count;
   __indirect_glVertexPointer(size, type, stride, pointer);
}

/*@}*/

/*****************************************************************************/

void
__indirect_glInterleavedArrays(GLenum format, GLsizei stride,
                               const GLvoid * pointer)
{
   __GLXcontext *gc = __glXGetCurrentContext();
   __GLXattribute *state = (__GLXattribute *) (gc->client_state_private);

#define NONE  {0, 0, 0}
#define F(x)  {GL_FLOAT, x, x * sizeof(GLfloat)}
#define UB4   {GL_UNSIGNED_BYTE, 4, 4 * sizeof(GLubyte)}

   /* Each row in this array describes the elements of a particular
    * interleaved array mode.  Each column describes, in the order in which
    * they appear in the interleaved arrays, one of the four possible types
    * of vertex data that can appear in an interleaved array.
    */
   struct
   {
        /**
	 * The enum describing the GL type, as would be passed to the
	 * appropriate gl*Pointer function.
	 */
      GLushort type;

        /**
	 * Number of elements in the subarray, as would be passed (as the
	 * \c size parameter) to the appropriate gl*Pointer function.
	 */
      GLubyte count;

        /**
	 * True size of a single element in the subarray, as would be passed
	 * (as the \c stride parameter) to the appropriate gl*Pointer
	 * function.
	 */
      GLubyte size;
   }
   static const modes[14][4] = {
      /* texture color normal vertex */
      {NONE, NONE, NONE, F(2)}, /* GL_V2F */
      {NONE, NONE, NONE, F(3)}, /* GL_V3F */
      {NONE, UB4, NONE, F(2)},  /* GL_C4UB_V2F */
      {NONE, UB4, NONE, F(3)},  /* GL_C4UB_V3F */
      {NONE, F(3), NONE, F(3)}, /* GL_C3F_V3F */
      {NONE, NONE, F(3), F(3)}, /* GL_N3F_V3F */
      {NONE, F(4), F(3), F(3)}, /* GL_C4F_N3F_V3F */
      {F(2), NONE, NONE, F(3)}, /* GL_T2F_V3F */
      {F(4), NONE, NONE, F(4)}, /* GL_T4F_V4F */
      {F(2), UB4, NONE, F(3)},  /* GL_T2F_C4UB_V3F */
      {F(2), F(3), NONE, F(3)}, /* GL_T2F_C3F_V3F */
      {F(2), NONE, F(3), F(3)}, /* GL_T2F_N3F_V3F */
      {F(2), F(4), F(3), F(3)}, /* GL_T2F_C4F_N3F_V3F */
      {F(4), F(4), F(3), F(4)}, /* GL_T4F_C4F_N3F_V4F */
   };
#undef NONE
#undef F
#undef UB4

   GLint trueStride, size;
   int offsets[4];
   unsigned i;
   const int idx = format - GL_V2F;


   /* All valid formats are on the range [GL_V2F, GL_V2F+0x0D].  Since idx
    * is just the format biased by -GL_V2F, all valid idx values are on the
    * range [0, 0x0D].
    */
   if ((idx < 0) || (idx > 0x0D)) {
      __glXSetError(gc, GL_INVALID_ENUM);
      return;
   }

   if (stride < 0) {
      __glXSetError(gc, GL_INVALID_VALUE);
      return;
   }


   /* If the 'count' for a subarray is non-zero, then the offset of its
    * first element is at the currently accumulated 'size'.
    */
   size = 0;
   for (i = 0; i < 4; i++) {
      offsets[i] = (modes[idx][i].count != 0) ? size : -1;
      size += modes[idx][i].size;
   }

   trueStride = (stride == 0) ? size : stride;

   __glXArrayDisableAll(state);

   if (offsets[0] >= 0) {
      __indirect_glEnableClientState(GL_TEXTURE_COORD_ARRAY);
      __indirect_glTexCoordPointer(modes[idx][0].count, GL_FLOAT,
                                   trueStride, (const char *) pointer);
   }
   if (offsets[1] >= 0) {
      __indirect_glEnableClientState(GL_COLOR_ARRAY);
      __indirect_glColorPointer(modes[idx][1].count, modes[idx][1].type,
                                trueStride,
                                (const char *) pointer + offsets[1]);
   }
   if (offsets[2] >= 0) {
      __indirect_glEnableClientState(GL_NORMAL_ARRAY);
      __indirect_glNormalPointer(GL_FLOAT, trueStride,
                                 (const char *) pointer + offsets[2]);
   }
   __indirect_glEnableClientState(GL_VERTEX_ARRAY);
   __indirect_glVertexPointer(modes[idx][3].count, GL_FLOAT,
                              trueStride,
                              (const char *) pointer + offsets[3]);
}