130 lines
4.4 KiB
C
130 lines
4.4 KiB
C
/**************************************************************************
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*
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* Copyright 2002 VMware, Inc.
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* Copyright 2011 Dave Airlie (ARB_vertex_type_2_10_10_10_rev support)
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* Copyright 2020 Advanced Micro Devices, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#ifndef VBO_UTIL_H
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#define VBO_UTIL_H
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static inline float conv_ui10_to_norm_float(unsigned ui10)
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{
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return ui10 / 1023.0f;
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}
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static inline float conv_ui2_to_norm_float(unsigned ui2)
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{
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return ui2 / 3.0f;
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}
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struct attr_bits_10 {signed int x:10;};
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struct attr_bits_2 {signed int x:2;};
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static inline float conv_i10_to_i(int i10)
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{
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struct attr_bits_10 val;
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val.x = i10;
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return (float)val.x;
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}
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static inline float conv_i2_to_i(int i2)
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{
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struct attr_bits_2 val;
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val.x = i2;
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return (float)val.x;
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}
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static inline float conv_i10_to_norm_float(const struct gl_context *ctx, int i10)
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{
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struct attr_bits_10 val;
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val.x = i10;
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/* Traditionally, OpenGL has had two equations for converting from
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* normalized fixed-point data to floating-point data. In the OpenGL 3.2
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* specification, these are equations 2.2 and 2.3, respectively:
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*
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* f = (2c + 1)/(2^b - 1). (2.2)
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*
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* Comments below this equation state: "In general, this representation is
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* used for signed normalized fixed-point parameters in GL commands, such
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* as vertex attribute values." Which is what we're doing here.
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*
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* f = max{c/(2^(b-1) - 1), -1.0} (2.3)
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*
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* Comments below this equation state: "In general, this representation is
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* used for signed normalized fixed-point texture or floating point values."
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*
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* OpenGL 4.2+ and ES 3.0 remedy this and state that equation 2.3 (above)
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* is used in every case. They remove equation 2.2 completely.
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*/
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if (_mesa_is_gles3(ctx) ||
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(_mesa_is_desktop_gl(ctx) && ctx->Version >= 42)) {
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/* Equation 2.3 above. */
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float f = ((float) val.x) / 511.0F;
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return MAX2(f, -1.0f);
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} else {
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/* Equation 2.2 above. */
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return (2.0F * (float)val.x + 1.0F) * (1.0F / 1023.0F);
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}
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}
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static inline float conv_i2_to_norm_float(const struct gl_context *ctx, int i2)
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{
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struct attr_bits_2 val;
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val.x = i2;
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if (_mesa_is_gles3(ctx) ||
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(_mesa_is_desktop_gl(ctx) && ctx->Version >= 42)) {
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/* Equation 2.3 above. */
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float f = (float) val.x;
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return MAX2(f, -1.0f);
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} else {
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/* Equation 2.2 above. */
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return (2.0F * (float)val.x + 1.0F) * (1.0F / 3.0F);
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}
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}
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#define ERROR_IF_NOT_PACKED_TYPE(ctx, type, func) \
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if (type != GL_INT_2_10_10_10_REV && type != GL_UNSIGNED_INT_2_10_10_10_REV) { \
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_mesa_error(ctx, GL_INVALID_ENUM, "%s(type)", func); \
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return; \
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}
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/* Extended version of ERROR_IF_NOT_PACKED_TYPE which also
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* accepts GL_UNSIGNED_INT_10F_11F_11F_REV.
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*
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* Only used for VertexAttribP[123]ui[v]; VertexAttribP4* cannot use this type,
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* and neither can legacy vertex attribs.
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*/
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#define ERROR_IF_NOT_PACKED_TYPE_EXT(ctx, type, func) \
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if (type != GL_INT_2_10_10_10_REV && type != GL_UNSIGNED_INT_2_10_10_10_REV && \
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type != GL_UNSIGNED_INT_10F_11F_11F_REV) { \
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_mesa_error(ctx, GL_INVALID_ENUM, "%s(type)", func); \
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return; \
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}
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#endif
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