src/mesa/main/api_validate.c - platform/external/mesa3d - Gitiles

 /*
  * 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 "context.h"
 #include "imports.h"
 #include "mtypes.h"
 #include "state.h"


 /**
  * Find the max index in the given element/index buffer
  */
 static GLuint
 max_buffer_index(GLcontext *ctx, GLuint count, GLenum type,
                  const void *indices,
                  struct gl_buffer_object *elementBuf)
 {
    const GLubyte *map = NULL;
    GLuint max = 0;
    GLint i;

    if (elementBuf->Name) {
       /* 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 render by examining framebuffer status and vertex arrays.
  */
 static GLboolean
 check_valid_to_render(GLcontext *ctx, char *function)
 {
    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
                   "glDraw%s(incomplete framebuffer)", function);
       return GL_FALSE;
    }

 #if FEATURE_es2_glsl
    /* 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;
 #else
    /* 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;
 #endif

    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(GLcontext *ctx,
 			    GLenum mode, GLsizei count, GLenum type,
 			    const GLvoid *indices)
 {
    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_POLYGON) {
       _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 (ctx->NewState)
       _mesa_update_state(ctx);

    if (!check_valid_to_render(ctx, "Elements"))
       return GL_FALSE;

    /* Vertex buffer object tests */
    if (ctx->Array.ElementArrayBufferObj->Name) {
       /* use indices in the buffer object */
       GLuint indexBytes;

       if (!ctx->Array.ElementArrayBufferObj->Size) {
          _mesa_warning(ctx,
                        "glDrawElements called with empty array elements buffer");
          return GL_FALSE;
       }

       if (type == GL_UNSIGNED_INT) {
          indexBytes = count * sizeof(GLuint);
       }
       else if (type == GL_UNSIGNED_BYTE) {
          indexBytes = count * sizeof(GLubyte);
       }
       else {
          ASSERT(type == GL_UNSIGNED_SHORT);
          indexBytes = count * sizeof(GLushort);
       }

       /* make sure count doesn't go outside buffer bounds */
       if (indexBytes > (GLuint) 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 (ctx->Const.CheckArrayBounds) {
       /* find max array index */
       GLuint max = max_buffer_index(ctx, count, type, indices,
                                     ctx->Array.ElementArrayBufferObj);
       if (max >= ctx->Array._MaxElement) {
          /* the max element is out of bounds of one or more enabled arrays */
          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(GLcontext *ctx, GLenum mode,
 				 GLuint start, GLuint end,
 				 GLsizei count, GLenum type,
 				 const GLvoid *indices)
 {
    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_POLYGON) {
       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
       return GL_FALSE;
    }

    if (end < start) {
       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
       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 (ctx->NewState)
       _mesa_update_state(ctx);

    if (!check_valid_to_render(ctx, "RangeElements"))
       return GL_FALSE;

    /* Vertex buffer object tests */
    if (ctx->Array.ElementArrayBufferObj->Name) {
       /* use indices in the buffer object */
       GLuint indexBytes;

       if (type == GL_UNSIGNED_INT) {
          indexBytes = count * sizeof(GLuint);
       }
       else if (type == GL_UNSIGNED_BYTE) {
          indexBytes = count * sizeof(GLubyte);
       }
       else {
          ASSERT(type == GL_UNSIGNED_SHORT);
          indexBytes = count * sizeof(GLushort);
       }

       /* make sure count doesn't go outside buffer bounds */
       if (indexBytes > 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 (ctx->Const.CheckArrayBounds) {
       GLuint max = max_buffer_index(ctx, count, type, indices,
                                     ctx->Array.ElementArrayBufferObj);
       if (max >= ctx->Array._MaxElement) {
          /* the max element is out of bounds of one or more enabled arrays */
          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(GLcontext *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_POLYGON) {
       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
       return GL_FALSE;
    }

    if (ctx->NewState)
       _mesa_update_state(ctx);

    if (!check_valid_to_render(ctx, "Arrays"))
       return GL_FALSE;

    if (ctx->Const.CheckArrayBounds) {
       if (start + count > (GLint) ctx->Array._MaxElement)
          return GL_FALSE;
    }

    return GL_TRUE;
 }
	/*
	* 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 "context.h"
	#include "imports.h"
	#include "mtypes.h"
	#include "state.h"


	/**
	* Find the max index in the given element/index buffer
	*/
	static GLuint
	max_buffer_index(GLcontext *ctx, GLuint count, GLenum type,
	const void *indices,
	struct gl_buffer_object *elementBuf)
	{
	const GLubyte *map = NULL;
	GLuint max = 0;
	GLint i;

	if (elementBuf->Name) {
	/* 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 render by examining framebuffer status and vertex arrays.
	*/
	static GLboolean
	check_valid_to_render(GLcontext ctx, char function)
	{
	if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
	_mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
	"glDraw%s(incomplete framebuffer)", function);
	return GL_FALSE;
	}

	#if FEATURE_es2_glsl
	/* 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;
	#else
	/* 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;
	#endif

	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(GLcontext *ctx,
	GLenum mode, GLsizei count, GLenum type,
	const GLvoid *indices)
	{
	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_POLYGON) {
	_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 (ctx->NewState)
	_mesa_update_state(ctx);

	if (!check_valid_to_render(ctx, "Elements"))
	return GL_FALSE;

	/* Vertex buffer object tests */
	if (ctx->Array.ElementArrayBufferObj->Name) {
	/* use indices in the buffer object */
	GLuint indexBytes;

	if (!ctx->Array.ElementArrayBufferObj->Size) {
	_mesa_warning(ctx,
	"glDrawElements called with empty array elements buffer");
	return GL_FALSE;
	}

	if (type == GL_UNSIGNED_INT) {
	indexBytes = count * sizeof(GLuint);
	}
	else if (type == GL_UNSIGNED_BYTE) {
	indexBytes = count * sizeof(GLubyte);
	}
	else {
	ASSERT(type == GL_UNSIGNED_SHORT);
	indexBytes = count * sizeof(GLushort);
	}

	/* make sure count doesn't go outside buffer bounds */
	if (indexBytes > (GLuint) 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 (ctx->Const.CheckArrayBounds) {
	/* find max array index */
	GLuint max = max_buffer_index(ctx, count, type, indices,
	ctx->Array.ElementArrayBufferObj);
	if (max >= ctx->Array._MaxElement) {
	/* the max element is out of bounds of one or more enabled arrays */
	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(GLcontext *ctx, GLenum mode,
	GLuint start, GLuint end,
	GLsizei count, GLenum type,
	const GLvoid *indices)
	{
	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_POLYGON) {
	_mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
	return GL_FALSE;
	}

	if (end < start) {
	_mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
	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 (ctx->NewState)
	_mesa_update_state(ctx);

	if (!check_valid_to_render(ctx, "RangeElements"))
	return GL_FALSE;

	/* Vertex buffer object tests */
	if (ctx->Array.ElementArrayBufferObj->Name) {
	/* use indices in the buffer object */
	GLuint indexBytes;

	if (type == GL_UNSIGNED_INT) {
	indexBytes = count * sizeof(GLuint);
	}
	else if (type == GL_UNSIGNED_BYTE) {
	indexBytes = count * sizeof(GLubyte);
	}
	else {
	ASSERT(type == GL_UNSIGNED_SHORT);
	indexBytes = count * sizeof(GLushort);
	}

	/* make sure count doesn't go outside buffer bounds */
	if (indexBytes > 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 (ctx->Const.CheckArrayBounds) {
	GLuint max = max_buffer_index(ctx, count, type, indices,
	ctx->Array.ElementArrayBufferObj);
	if (max >= ctx->Array._MaxElement) {
	/* the max element is out of bounds of one or more enabled arrays */
	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(GLcontext *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_POLYGON) {
	_mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
	return GL_FALSE;
	}

	if (ctx->NewState)
	_mesa_update_state(ctx);

	if (!check_valid_to_render(ctx, "Arrays"))
	return GL_FALSE;

	if (ctx->Const.CheckArrayBounds) {
	if (start + count > (GLint) ctx->Array._MaxElement)
	return GL_FALSE;
	}

	return GL_TRUE;
	}