| /************************************************************************** |
| * |
| * 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 |
| |
| 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 |