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/**************************************************************************
*
* Copyright 2002 VMware, Inc.
* Copyright 2011 Dave Airlie (ARB_vertex_type_2_10_10_10_rev support)
* Copyright 2020 Advanced Micro Devices, 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, sub license, 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 (including the
* next paragraph) 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
#ifndef VBO_UTIL_H
#define VBO_UTIL_H
#include "main/mtypes.h"
static inline float conv_ui10_to_norm_float(unsigned ui10)
{
return ui10 / 1023.0f;
}
static inline float conv_ui2_to_norm_float(unsigned ui2)
{
return ui2 / 3.0f;
}
struct attr_bits_10 {signed int x:10;};
struct attr_bits_2 {signed int x:2;};
static inline float conv_i10_to_i(int i10)
{
struct attr_bits_10 val;
val.x = i10;
return (float)val.x;
}
static inline float conv_i2_to_i(int i2)
{
struct attr_bits_2 val;
val.x = i2;
return (float)val.x;
}
static inline float conv_i10_to_norm_float(const struct gl_context *ctx, int i10)
{
struct attr_bits_10 val;
val.x = i10;
/* Traditionally, OpenGL has had two equations for converting from
* normalized fixed-point data to floating-point data. In the OpenGL 3.2
* specification, these are equations 2.2 and 2.3, respectively:
*
* f = (2c + 1)/(2^b - 1). (2.2)
*
* Comments below this equation state: "In general, this representation is
* used for signed normalized fixed-point parameters in GL commands, such
* as vertex attribute values." Which is what we're doing here.
*
* f = max{c/(2^(b-1) - 1), -1.0} (2.3)
*
* Comments below this equation state: "In general, this representation is
* used for signed normalized fixed-point texture or floating point values."
*
* OpenGL 4.2+ and ES 3.0 remedy this and state that equation 2.3 (above)
* is used in every case. They remove equation 2.2 completely.
*/
if (_mesa_is_gles3(ctx) ||
(_mesa_is_desktop_gl(ctx) && ctx->Version >= 42)) {
/* Equation 2.3 above. */
float f = ((float) val.x) / 511.0F;
return MAX2(f, -1.0f);
} else {
/* Equation 2.2 above. */
return (2.0F * (float)val.x + 1.0F) * (1.0F / 1023.0F);
}
}
static inline float conv_i2_to_norm_float(const struct gl_context *ctx, int i2)
{
struct attr_bits_2 val;
val.x = i2;
if (_mesa_is_gles3(ctx) ||
(_mesa_is_desktop_gl(ctx) && ctx->Version >= 42)) {
/* Equation 2.3 above. */
float f = (float) val.x;
return MAX2(f, -1.0f);
} else {
/* Equation 2.2 above. */
return (2.0F * (float)val.x + 1.0F) * (1.0F / 3.0F);
}
}
#define ERROR_IF_NOT_PACKED_TYPE(ctx, type, func) \
if (type != GL_INT_2_10_10_10_REV && type != GL_UNSIGNED_INT_2_10_10_10_REV) { \
_mesa_error(ctx, GL_INVALID_ENUM, "%s(type)", func); \
return; \
}
/* Extended version of ERROR_IF_NOT_PACKED_TYPE which also
* accepts GL_UNSIGNED_INT_10F_11F_11F_REV.
*
* Only used for VertexAttribP[123]ui[v]; VertexAttribP4* cannot use this type,
* and neither can legacy vertex attribs.
*/
#define ERROR_IF_NOT_PACKED_TYPE_EXT(ctx, type, func) \
if (type != GL_INT_2_10_10_10_REV && type != GL_UNSIGNED_INT_2_10_10_10_REV && \
type != GL_UNSIGNED_INT_10F_11F_11F_REV) { \
_mesa_error(ctx, GL_INVALID_ENUM, "%s(type)", func); \
return; \
}
#endif
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