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/*

 * Mesa 3-D graphics library

 * Version:  7.1

 *

 * Copyright (C) 1999-2007  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"),

 * 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

 * BRIAN PAUL 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.

 */

#include "glheader.h"

#include "api_validate.h"

#include "bufferobj.h"

#include "context.h"

#include "imports.h"

#include "mfeatures.h"

#include "mtypes.h"

#include "vbo/vbo.h"

/**

 * \return  number of bytes in array [count] of type.

 */

static GLsizei

index_bytes(GLenum type, GLsizei count)

{

   if (type == GL_UNSIGNED_INT) {

      return count * sizeof(GLuint);

   }

   else if (type == GL_UNSIGNED_BYTE) {

      return count * sizeof(GLubyte);

   }

   else {

      ASSERT(type == GL_UNSIGNED_SHORT);

      return count * sizeof(GLushort);

   }

}

/**

 * Find the max index in the given element/index buffer

 */

GLuint

_mesa_max_buffer_index(struct gl_context *ctx, GLuint count, GLenum type,

                       const void *indices,

                       struct gl_buffer_object *elementBuf)

{

   const GLubyte *map = NULL;

   GLuint max = 0;

   GLuint i;

   if (_mesa_is_bufferobj(elementBuf)) {

      /* elements are in a user-defined buffer object.  need to map it */

      map = ctx->Driver.MapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER,

                                  GL_READ_ONLY, elementBuf);

      /* Actual address is the sum of pointers */

      indices = (const GLvoid *) ADD_POINTERS(map, (const GLubyte *) indices);

   }

   if (type == GL_UNSIGNED_INT) {

      for (i = 0; i < count; i++)

         if (((GLuint *) indices)[i] > max)

            max = ((GLuint *) indices)[i];

   }

   else if (type == GL_UNSIGNED_SHORT) {

      for (i = 0; i < count; i++)

         if (((GLushort *) indices)[i] > max)

            max = ((GLushort *) indices)[i];

   }

   else {

      ASSERT(type == GL_UNSIGNED_BYTE);

      for (i = 0; i < count; i++)

         if (((GLubyte *) indices)[i] > max)

            max = ((GLubyte *) indices)[i];

   }

   if (map) {

      ctx->Driver.UnmapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, elementBuf);

   }

   return max;

}

/**

 * Check if OK to draw arrays/elements.

 */

static GLboolean

check_valid_to_render(struct gl_context *ctx, const char *function)

{

   if (!_mesa_valid_to_render(ctx, function)) {

      return GL_FALSE;

   }

   switch (ctx->API) {

#if FEATURE_es2_glsl

   case API_OPENGLES2:

      /* For ES2, we can draw if any vertex array is enabled (and we

       * should always have a vertex program/shader). */

      if (ctx->Array.ArrayObj->_Enabled == 0x0 || !ctx->VertexProgram._Current)

	 return GL_FALSE;

      break;

#endif

#if FEATURE_ES1 || FEATURE_GL

   case API_OPENGLES:

   case API_OPENGL:

      /* For regular OpenGL, only draw if we have vertex positions

       * (regardless of whether or not we have a vertex program/shader). */

      if (!ctx->Array.ArrayObj->Vertex.Enabled &&

	  !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)

	 return GL_FALSE;

      break;

#endif

   default:

      ASSERT_NO_FEATURE();

   }

   return GL_TRUE;

}

/**

 * Do bounds checking on array element indexes.  Check that the vertices

 * pointed to by the indices don't lie outside buffer object bounds.

 * \return GL_TRUE if OK, GL_FALSE if any indexed vertex goes is out of bounds

 */

static GLboolean

check_index_bounds(struct gl_context *ctx, GLsizei count, GLenum type,

		   const GLvoid *indices, GLint basevertex)

{

   struct _mesa_prim prim;

   struct _mesa_index_buffer ib;

   GLuint min, max;

   /* Only the X Server needs to do this -- otherwise, accessing outside

    * array/BO bounds allows application termination.

    */

   if (!ctx->Const.CheckArrayBounds)

      return GL_TRUE;

   memset(&prim, 0, sizeof(prim));

   prim.count = count;

   memset(&ib, 0, sizeof(ib));

   ib.type = type;

   ib.ptr = indices;

   ib.obj = ctx->Array.ElementArrayBufferObj;

   vbo_get_minmax_index(ctx, &prim, &ib, &min, &max);

   if ((int)(min + basevertex) < 0 ||

       max + basevertex > ctx->Array.ArrayObj->_MaxElement) {

      /* the max element is out of bounds of one or more enabled arrays */

      _mesa_warning(ctx, "glDrawElements() index=%u is out of bounds (max=%u)",

                    max, ctx->Array.ArrayObj->_MaxElement);

      return GL_FALSE;

   }

   return GL_TRUE;

}

/**

 * Error checking for glDrawElements().  Includes parameter checking

 * and VBO bounds checking.

 * \return GL_TRUE if OK to render, GL_FALSE if error found

 */

GLboolean

_mesa_validate_DrawElements(struct gl_context *ctx,

			    GLenum mode, GLsizei count, GLenum type,

			    const GLvoid *indices, GLint basevertex)

{

   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);

   if (count <= 0) {

      if (count < 0)

	 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" );

      return GL_FALSE;

   }

   if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {

      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" );

      return GL_FALSE;

   }

   if (type != GL_UNSIGNED_INT &&

       type != GL_UNSIGNED_BYTE &&

       type != GL_UNSIGNED_SHORT)

   {

      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" );

      return GL_FALSE;

   }

   if (!check_valid_to_render(ctx, "glDrawElements"))

      return GL_FALSE;

   /* Vertex buffer object tests */

   if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {

      /* use indices in the buffer object */

      /* make sure count doesn't go outside buffer bounds */

      if (index_bytes(type, count) > ctx->Array.ElementArrayBufferObj->Size) {

         _mesa_warning(ctx, "glDrawElements index out of buffer bounds");

         return GL_FALSE;

      }

   }

   else {

      /* not using a VBO */

      if (!indices)

         return GL_FALSE;

   }

   if (!check_index_bounds(ctx, count, type, indices, basevertex))

      return GL_FALSE;

   return GL_TRUE;

}

/**

 * Error checking for glDrawRangeElements().  Includes parameter checking

 * and VBO bounds checking.

 * \return GL_TRUE if OK to render, GL_FALSE if error found

 */

GLboolean

_mesa_validate_DrawRangeElements(struct gl_context *ctx, GLenum mode,

				 GLuint start, GLuint end,

				 GLsizei count, GLenum type,

				 const GLvoid *indices, GLint basevertex)

{

   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);

   if (count <= 0) {

      if (count < 0)

	 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );

      return GL_FALSE;

   }

   if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {

      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );

      return GL_FALSE;

   }

   if (end < start) {

      _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end

      return GL_FALSE;

   }

   if (type != GL_UNSIGNED_INT &&

       type != GL_UNSIGNED_BYTE &&

       type != GL_UNSIGNED_SHORT) {

      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );

      return GL_FALSE;

   }

   if (!check_valid_to_render(ctx, "glDrawRangeElements"))

      return GL_FALSE;

   /* Vertex buffer object tests */

   if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {

      /* use indices in the buffer object */

      /* make sure count doesn't go outside buffer bounds */

      if (index_bytes(type, count) > ctx->Array.ElementArrayBufferObj->Size) {

         _mesa_warning(ctx, "glDrawRangeElements index out of buffer bounds");

         return GL_FALSE;

      }

   }

   else {

      /* not using a VBO */

      if (!indices)

         return GL_FALSE;

   }

   if (!check_index_bounds(ctx, count, type, indices, basevertex))

      return GL_FALSE;

   return GL_TRUE;

}

/**

 * Called from the tnl module to error check the function parameters and

 * verify that we really can draw something.

 * \return GL_TRUE if OK to render, GL_FALSE if error found

 */

GLboolean

_mesa_validate_DrawArrays(struct gl_context *ctx,

			  GLenum mode, GLint start, GLsizei count)

{

   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);

   if (count <= 0) {

      if (count < 0)

         _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );

      return GL_FALSE;

   }

   if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {

      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );

      return GL_FALSE;

   }

   if (!check_valid_to_render(ctx, "glDrawArrays"))

      return GL_FALSE;

   if (ctx->Const.CheckArrayBounds) {

      if (start + count > (GLint) ctx->Array.ArrayObj->_MaxElement)

         return GL_FALSE;

   }

   return GL_TRUE;

}

GLboolean

_mesa_validate_DrawArraysInstanced(struct gl_context *ctx, GLenum mode, GLint first,

                                   GLsizei count, GLsizei primcount)

{

   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);

   if (count <= 0) {

      if (count < 0)

         _mesa_error(ctx, GL_INVALID_VALUE,

                     "glDrawArraysInstanced(count=%d)", count);

      return GL_FALSE;

   }

   if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {

      _mesa_error(ctx, GL_INVALID_ENUM,

                  "glDrawArraysInstanced(mode=0x%x)", mode);

      return GL_FALSE;

   }

   if (primcount <= 0) {

      if (primcount < 0)

         _mesa_error(ctx, GL_INVALID_VALUE,

                     "glDrawArraysInstanced(primcount=%d)", primcount);

      return GL_FALSE;

   }

   if (!check_valid_to_render(ctx, "glDrawArraysInstanced(invalid to render)"))

      return GL_FALSE;

   if (ctx->CompileFlag) {

      _mesa_error(ctx, GL_INVALID_OPERATION,

                  "glDrawArraysInstanced(display list");

      return GL_FALSE;

   }

   if (ctx->Const.CheckArrayBounds) {

      if (first + count > (GLint) ctx->Array.ArrayObj->_MaxElement)

         return GL_FALSE;

   }

   return GL_TRUE;

}

GLboolean

_mesa_validate_DrawElementsInstanced(struct gl_context *ctx,

                                     GLenum mode, GLsizei count, GLenum type,

                                     const GLvoid *indices, GLsizei primcount)

{

   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);

   if (count <= 0) {

      if (count < 0)

	 _mesa_error(ctx, GL_INVALID_VALUE,

                     "glDrawElementsInstanced(count=%d)", count);

      return GL_FALSE;

   }

   if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {

      _mesa_error(ctx, GL_INVALID_ENUM,

                  "glDrawElementsInstanced(mode = 0x%x)", mode);

      return GL_FALSE;

   }

   if (type != GL_UNSIGNED_INT &&

       type != GL_UNSIGNED_BYTE &&

       type != GL_UNSIGNED_SHORT) {

      _mesa_error(ctx, GL_INVALID_ENUM,

                  "glDrawElementsInstanced(type=0x%x)", type);

      return GL_FALSE;

   }

   if (primcount <= 0) {

      if (primcount < 0)

         _mesa_error(ctx, GL_INVALID_VALUE,

                     "glDrawElementsInstanced(primcount=%d)", primcount);

      return GL_FALSE;

   }

   if (!check_valid_to_render(ctx, "glDrawElementsInstanced"))

      return GL_FALSE;

   /* Vertex buffer object tests */

   if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {

      /* use indices in the buffer object */

      /* make sure count doesn't go outside buffer bounds */

      if (index_bytes(type, count) > ctx->Array.ElementArrayBufferObj->Size) {

         _mesa_warning(ctx,

                       "glDrawElementsInstanced index out of buffer bounds");

         return GL_FALSE;

      }

   }

   else {

      /* not using a VBO */

      if (!indices)

         return GL_FALSE;

   }

   if (!check_index_bounds(ctx, count, type, indices, 0))

      return GL_FALSE;

   return GL_TRUE;

}