from __future__ import print_function from mako.template import Template from sys import argv string = """/* * Mesa 3-D graphics library * * Copyright (c) 2011 VMware, Inc. * Copyright (c) 2014 Intel Corporation. * * 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 * THE AUTHORS OR COPYRIGHT HOLDERS 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. */ /** * Color, depth, stencil packing functions. * Used to pack basic color, depth and stencil formats to specific * hardware formats. * * There are both per-pixel and per-row packing functions: * - The former will be used by swrast to write values to the color, depth, * stencil buffers when drawing points, lines and masked spans. * - The later will be used for image-oriented functions like glDrawPixels, * glAccum, and glTexImage. */ #include #include "config.h" #include "errors.h" #include "format_pack.h" #include "format_utils.h" #include "macros.h" #include "util/format_rgb9e5.h" #include "util/format_r11g11b10f.h" #include "util/format_srgb.h" #define UNPACK(SRC, OFFSET, BITS) (((SRC) >> (OFFSET)) & MAX_UINT(BITS)) #define PACK(SRC, OFFSET, BITS) (((SRC) & MAX_UINT(BITS)) << (OFFSET)) <% import format_parser as parser formats = parser.parse(argv[1]) rgb_formats = [] for f in formats: if f.name == 'MESA_FORMAT_NONE': continue if f.colorspace not in ('rgb', 'srgb'): continue rgb_formats.append(f) %> /* ubyte packing functions */ %for f in rgb_formats: %if f.name in ('MESA_FORMAT_R9G9B9E5_FLOAT', 'MESA_FORMAT_R11G11B10_FLOAT'): <% continue %> %elif f.is_compressed(): <% continue %> %endif static inline void pack_ubyte_${f.short_name()}(const GLubyte src[4], void *dst) { %for (i, c) in enumerate(f.channels): <% i = f.swizzle.inverse()[i] %> %if c.type == 'x': <% continue %> %endif ${c.datatype()} ${c.name} = %if not f.is_normalized() and f.is_int(): %if c.type == parser.SIGNED: _mesa_unsigned_to_signed(src[${i}], ${c.size}); %else: _mesa_unsigned_to_unsigned(src[${i}], ${c.size}); %endif %elif c.type == parser.UNSIGNED: %if f.colorspace == 'srgb' and c.name in 'rgb': <% assert c.size == 8 %> util_format_linear_to_srgb_8unorm(src[${i}]); %else: _mesa_unorm_to_unorm(src[${i}], 8, ${c.size}); %endif %elif c.type == parser.SIGNED: _mesa_unorm_to_snorm(src[${i}], 8, ${c.size}); %elif c.type == parser.FLOAT: %if c.size == 32: _mesa_unorm_to_float(src[${i}], 8); %elif c.size == 16: _mesa_unorm_to_half(src[${i}], 8); %else: <% assert False %> %endif %else: <% assert False %> %endif %endfor %if f.layout == parser.ARRAY: ${f.datatype()} *d = (${f.datatype()} *)dst; %for (i, c) in enumerate(f.channels): %if c.type == 'x': <% continue %> %endif d[${i}] = ${c.name}; %endfor %elif f.layout == parser.PACKED: ${f.datatype()} d = 0; %for (i, c) in enumerate(f.channels): %if c.type == 'x': <% continue %> %endif d |= PACK(${c.name}, ${c.shift}, ${c.size}); %endfor (*(${f.datatype()} *)dst) = d; %else: <% assert False %> %endif } %endfor static inline void pack_ubyte_r9g9b9e5_float(const GLubyte src[4], void *dst) { GLuint *d = (GLuint *) dst; GLfloat rgb[3]; rgb[0] = _mesa_unorm_to_float(src[RCOMP], 8); rgb[1] = _mesa_unorm_to_float(src[GCOMP], 8); rgb[2] = _mesa_unorm_to_float(src[BCOMP], 8); *d = float3_to_rgb9e5(rgb); } static inline void pack_ubyte_r11g11b10_float(const GLubyte src[4], void *dst) { GLuint *d = (GLuint *) dst; GLfloat rgb[3]; rgb[0] = _mesa_unorm_to_float(src[RCOMP], 8); rgb[1] = _mesa_unorm_to_float(src[GCOMP], 8); rgb[2] = _mesa_unorm_to_float(src[BCOMP], 8); *d = float3_to_r11g11b10f(rgb); } /* uint packing functions */ %for f in rgb_formats: %if not f.is_int(): <% continue %> %elif f.is_normalized(): <% continue %> %elif f.is_compressed(): <% continue %> %endif static inline void pack_uint_${f.short_name()}(const GLuint src[4], void *dst) { %for (i, c) in enumerate(f.channels): <% i = f.swizzle.inverse()[i] %> %if c.type == 'x': <% continue %> %endif ${c.datatype()} ${c.name} = %if c.type == parser.SIGNED: _mesa_signed_to_signed(src[${i}], ${c.size}); %elif c.type == parser.UNSIGNED: _mesa_unsigned_to_unsigned(src[${i}], ${c.size}); %else: assert(!"Invalid type: only integer types are allowed"); %endif %endfor %if f.layout == parser.ARRAY: ${f.datatype()} *d = (${f.datatype()} *)dst; %for (i, c) in enumerate(f.channels): %if c.type == 'x': <% continue %> %endif d[${i}] = ${c.name}; %endfor %elif f.layout == parser.PACKED: ${f.datatype()} d = 0; %for (i, c) in enumerate(f.channels): %if c.type == 'x': <% continue %> %endif d |= PACK(${c.name}, ${c.shift}, ${c.size}); %endfor (*(${f.datatype()} *)dst) = d; %else: <% assert False %> %endif } %endfor /* float packing functions */ %for f in rgb_formats: %if f.name in ('MESA_FORMAT_R9G9B9E5_FLOAT', 'MESA_FORMAT_R11G11B10_FLOAT'): <% continue %> %elif f.is_int() and not f.is_normalized(): <% continue %> %elif f.is_compressed(): <% continue %> %endif static inline void pack_float_${f.short_name()}(const GLfloat src[4], void *dst) { %for (i, c) in enumerate(f.channels): <% i = f.swizzle.inverse()[i] %> %if c.type == 'x': <% continue %> %endif ${c.datatype()} ${c.name} = %if c.type == parser.UNSIGNED: %if f.colorspace == 'srgb' and c.name in 'rgb': <% assert c.size == 8 %> util_format_linear_float_to_srgb_8unorm(src[${i}]); %else: _mesa_float_to_unorm(src[${i}], ${c.size}); %endif %elif c.type == parser.SIGNED: _mesa_float_to_snorm(src[${i}], ${c.size}); %elif c.type == parser.FLOAT: %if c.size == 32: src[${i}]; %elif c.size == 16: _mesa_float_to_half(src[${i}]); %else: <% assert False %> %endif %else: <% assert False %> %endif %endfor %if f.layout == parser.ARRAY: ${f.datatype()} *d = (${f.datatype()} *)dst; %for (i, c) in enumerate(f.channels): %if c.type == 'x': <% continue %> %endif d[${i}] = ${c.name}; %endfor %elif f.layout == parser.PACKED: ${f.datatype()} d = 0; %for (i, c) in enumerate(f.channels): %if c.type == 'x': <% continue %> %endif d |= PACK(${c.name}, ${c.shift}, ${c.size}); %endfor (*(${f.datatype()} *)dst) = d; %else: <% assert False %> %endif } %endfor static inline void pack_float_r9g9b9e5_float(const GLfloat src[4], void *dst) { GLuint *d = (GLuint *) dst; *d = float3_to_rgb9e5(src); } static inline void pack_float_r11g11b10_float(const GLfloat src[4], void *dst) { GLuint *d = (GLuint *) dst; *d = float3_to_r11g11b10f(src); } /** * Return a function that can pack a GLubyte rgba[4] color. */ gl_pack_ubyte_rgba_func _mesa_get_pack_ubyte_rgba_function(mesa_format format) { switch (format) { %for f in rgb_formats: %if f.is_compressed(): <% continue %> %endif case ${f.name}: return pack_ubyte_${f.short_name()}; %endfor default: return NULL; } } /** * Return a function that can pack a GLfloat rgba[4] color. */ gl_pack_float_rgba_func _mesa_get_pack_float_rgba_function(mesa_format format) { switch (format) { %for f in rgb_formats: %if f.is_compressed(): <% continue %> %elif f.is_int() and not f.is_normalized(): <% continue %> %endif case ${f.name}: return pack_float_${f.short_name()}; %endfor default: return NULL; } } /** * Pack a row of GLubyte rgba[4] values to the destination. */ void _mesa_pack_ubyte_rgba_row(mesa_format format, GLuint n, const GLubyte src[][4], void *dst) { GLuint i; GLubyte *d = dst; switch (format) { %for f in rgb_formats: %if f.is_compressed(): <% continue %> %endif case ${f.name}: for (i = 0; i < n; ++i) { pack_ubyte_${f.short_name()}(src[i], d); d += ${f.block_size() // 8}; } break; %endfor default: assert(!"Invalid format"); } } /** * Pack a row of GLuint rgba[4] values to the destination. */ void _mesa_pack_uint_rgba_row(mesa_format format, GLuint n, const GLuint src[][4], void *dst) { GLuint i; GLubyte *d = dst; switch (format) { %for f in rgb_formats: %if not f.is_int(): <% continue %> %elif f.is_normalized(): <% continue %> %elif f.is_compressed(): <% continue %> %endif case ${f.name}: for (i = 0; i < n; ++i) { pack_uint_${f.short_name()}(src[i], d); d += ${f.block_size() // 8}; } break; %endfor default: assert(!"Invalid format"); } } /** * Pack a row of GLfloat rgba[4] values to the destination. */ void _mesa_pack_float_rgba_row(mesa_format format, GLuint n, const GLfloat src[][4], void *dst) { GLuint i; GLubyte *d = dst; switch (format) { %for f in rgb_formats: %if f.is_compressed(): <% continue %> %elif f.is_int() and not f.is_normalized(): <% continue %> %endif case ${f.name}: for (i = 0; i < n; ++i) { pack_float_${f.short_name()}(src[i], d); d += ${f.block_size() // 8}; } break; %endfor default: assert(!"Invalid format"); } } /** * Pack a 2D image of ubyte RGBA pixels in the given format. * \param srcRowStride source image row stride in bytes * \param dstRowStride destination image row stride in bytes */ void _mesa_pack_ubyte_rgba_rect(mesa_format format, GLuint width, GLuint height, const GLubyte *src, GLint srcRowStride, void *dst, GLint dstRowStride) { GLubyte *dstUB = dst; GLuint i; if (srcRowStride == width * 4 * sizeof(GLubyte) && dstRowStride == _mesa_format_row_stride(format, width)) { /* do whole image at once */ _mesa_pack_ubyte_rgba_row(format, width * height, (const GLubyte (*)[4]) src, dst); } else { /* row by row */ for (i = 0; i < height; i++) { _mesa_pack_ubyte_rgba_row(format, width, (const GLubyte (*)[4]) src, dstUB); src += srcRowStride; dstUB += dstRowStride; } } } /** Helper struct for MESA_FORMAT_Z32_FLOAT_S8X24_UINT */ struct z32f_x24s8 { float z; uint32_t x24s8; }; /** ** Pack float Z pixels **/ static void pack_float_S8_UINT_Z24_UNORM(const GLfloat *src, void *dst) { /* don't disturb the stencil values */ GLuint *d = ((GLuint *) dst); const GLdouble scale = (GLdouble) 0xffffff; GLuint s = *d & 0xff; GLuint z = (GLuint) (*src * scale); assert(z <= 0xffffff); *d = (z << 8) | s; } static void pack_float_Z24_UNORM_S8_UINT(const GLfloat *src, void *dst) { /* don't disturb the stencil values */ GLuint *d = ((GLuint *) dst); const GLdouble scale = (GLdouble) 0xffffff; GLuint s = *d & 0xff000000; GLuint z = (GLuint) (*src * scale); assert(z <= 0xffffff); *d = s | z; } static void pack_float_Z_UNORM16(const GLfloat *src, void *dst) { GLushort *d = ((GLushort *) dst); const GLfloat scale = (GLfloat) 0xffff; *d = (GLushort) (*src * scale); } static void pack_float_Z_UNORM32(const GLfloat *src, void *dst) { GLuint *d = ((GLuint *) dst); const GLdouble scale = (GLdouble) 0xffffffff; *d = (GLuint) (*src * scale); } /** ** Pack float to Z_FLOAT32 or Z_FLOAT32_X24S8. **/ static void pack_float_Z_FLOAT32(const GLfloat *src, void *dst) { GLfloat *d = (GLfloat *) dst; *d = *src; } gl_pack_float_z_func _mesa_get_pack_float_z_func(mesa_format format) { switch (format) { case MESA_FORMAT_S8_UINT_Z24_UNORM: case MESA_FORMAT_X8_UINT_Z24_UNORM: return pack_float_S8_UINT_Z24_UNORM; case MESA_FORMAT_Z24_UNORM_S8_UINT: case MESA_FORMAT_Z24_UNORM_X8_UINT: return pack_float_Z24_UNORM_S8_UINT; case MESA_FORMAT_Z_UNORM16: return pack_float_Z_UNORM16; case MESA_FORMAT_Z_UNORM32: return pack_float_Z_UNORM32; case MESA_FORMAT_Z_FLOAT32: case MESA_FORMAT_Z32_FLOAT_S8X24_UINT: return pack_float_Z_FLOAT32; default: _mesa_problem(NULL, "unexpected format in _mesa_get_pack_float_z_func()"); return NULL; } } /** ** Pack uint Z pixels. The incoming src value is always in ** the range [0, 2^32-1]. **/ static void pack_uint_S8_UINT_Z24_UNORM(const GLuint *src, void *dst) { /* don't disturb the stencil values */ GLuint *d = ((GLuint *) dst); GLuint s = *d & 0xff; GLuint z = *src & 0xffffff00; *d = z | s; } static void pack_uint_Z24_UNORM_S8_UINT(const GLuint *src, void *dst) { /* don't disturb the stencil values */ GLuint *d = ((GLuint *) dst); GLuint s = *d & 0xff000000; GLuint z = *src >> 8; *d = s | z; } static void pack_uint_Z_UNORM16(const GLuint *src, void *dst) { GLushort *d = ((GLushort *) dst); *d = *src >> 16; } static void pack_uint_Z_UNORM32(const GLuint *src, void *dst) { GLuint *d = ((GLuint *) dst); *d = *src; } /** ** Pack uint to Z_FLOAT32 or Z_FLOAT32_X24S8. **/ static void pack_uint_Z_FLOAT32(const GLuint *src, void *dst) { GLfloat *d = ((GLfloat *) dst); const GLdouble scale = 1.0 / (GLdouble) 0xffffffff; *d = (GLfloat) (*src * scale); assert(*d >= 0.0f); assert(*d <= 1.0f); } gl_pack_uint_z_func _mesa_get_pack_uint_z_func(mesa_format format) { switch (format) { case MESA_FORMAT_S8_UINT_Z24_UNORM: case MESA_FORMAT_X8_UINT_Z24_UNORM: return pack_uint_S8_UINT_Z24_UNORM; case MESA_FORMAT_Z24_UNORM_S8_UINT: case MESA_FORMAT_Z24_UNORM_X8_UINT: return pack_uint_Z24_UNORM_S8_UINT; case MESA_FORMAT_Z_UNORM16: return pack_uint_Z_UNORM16; case MESA_FORMAT_Z_UNORM32: return pack_uint_Z_UNORM32; case MESA_FORMAT_Z_FLOAT32: case MESA_FORMAT_Z32_FLOAT_S8X24_UINT: return pack_uint_Z_FLOAT32; default: _mesa_problem(NULL, "unexpected format in _mesa_get_pack_uint_z_func()"); return NULL; } } /** ** Pack ubyte stencil pixels **/ static void pack_ubyte_stencil_Z24_S8(const GLubyte *src, void *dst) { /* don't disturb the Z values */ GLuint *d = ((GLuint *) dst); GLuint s = *src; GLuint z = *d & 0xffffff00; *d = z | s; } static void pack_ubyte_stencil_S8_Z24(const GLubyte *src, void *dst) { /* don't disturb the Z values */ GLuint *d = ((GLuint *) dst); GLuint s = *src << 24; GLuint z = *d & 0xffffff; *d = s | z; } static void pack_ubyte_stencil_S8(const GLubyte *src, void *dst) { GLubyte *d = (GLubyte *) dst; *d = *src; } static void pack_ubyte_stencil_Z32_FLOAT_X24S8(const GLubyte *src, void *dst) { GLfloat *d = ((GLfloat *) dst); d[1] = *src; } gl_pack_ubyte_stencil_func _mesa_get_pack_ubyte_stencil_func(mesa_format format) { switch (format) { case MESA_FORMAT_S8_UINT_Z24_UNORM: return pack_ubyte_stencil_Z24_S8; case MESA_FORMAT_Z24_UNORM_S8_UINT: return pack_ubyte_stencil_S8_Z24; case MESA_FORMAT_S_UINT8: return pack_ubyte_stencil_S8; case MESA_FORMAT_Z32_FLOAT_S8X24_UINT: return pack_ubyte_stencil_Z32_FLOAT_X24S8; default: _mesa_problem(NULL, "unexpected format in _mesa_pack_ubyte_stencil_func()"); return NULL; } } void _mesa_pack_float_z_row(mesa_format format, GLuint n, const GLfloat *src, void *dst) { switch (format) { case MESA_FORMAT_S8_UINT_Z24_UNORM: case MESA_FORMAT_X8_UINT_Z24_UNORM: { /* don't disturb the stencil values */ GLuint *d = ((GLuint *) dst); const GLdouble scale = (GLdouble) 0xffffff; GLuint i; for (i = 0; i < n; i++) { GLuint s = d[i] & 0xff; GLuint z = (GLuint) (src[i] * scale); assert(z <= 0xffffff); d[i] = (z << 8) | s; } } break; case MESA_FORMAT_Z24_UNORM_S8_UINT: case MESA_FORMAT_Z24_UNORM_X8_UINT: { /* don't disturb the stencil values */ GLuint *d = ((GLuint *) dst); const GLdouble scale = (GLdouble) 0xffffff; GLuint i; for (i = 0; i < n; i++) { GLuint s = d[i] & 0xff000000; GLuint z = (GLuint) (src[i] * scale); assert(z <= 0xffffff); d[i] = s | z; } } break; case MESA_FORMAT_Z_UNORM16: { GLushort *d = ((GLushort *) dst); const GLfloat scale = (GLfloat) 0xffff; GLuint i; for (i = 0; i < n; i++) { d[i] = (GLushort) (src[i] * scale); } } break; case MESA_FORMAT_Z_UNORM32: { GLuint *d = ((GLuint *) dst); const GLdouble scale = (GLdouble) 0xffffffff; GLuint i; for (i = 0; i < n; i++) { d[i] = (GLuint) (src[i] * scale); } } break; case MESA_FORMAT_Z_FLOAT32: memcpy(dst, src, n * sizeof(GLfloat)); break; case MESA_FORMAT_Z32_FLOAT_S8X24_UINT: { struct z32f_x24s8 *d = (struct z32f_x24s8 *) dst; GLuint i; for (i = 0; i < n; i++) { d[i].z = src[i]; } } break; default: _mesa_problem(NULL, "unexpected format in _mesa_pack_float_z_row()"); } } /** * The incoming Z values are always in the range [0, 0xffffffff]. */ void _mesa_pack_uint_z_row(mesa_format format, GLuint n, const GLuint *src, void *dst) { switch (format) { case MESA_FORMAT_S8_UINT_Z24_UNORM: case MESA_FORMAT_X8_UINT_Z24_UNORM: { /* don't disturb the stencil values */ GLuint *d = ((GLuint *) dst); GLuint i; for (i = 0; i < n; i++) { GLuint s = d[i] & 0xff; GLuint z = src[i] & 0xffffff00; d[i] = z | s; } } break; case MESA_FORMAT_Z24_UNORM_S8_UINT: case MESA_FORMAT_Z24_UNORM_X8_UINT: { /* don't disturb the stencil values */ GLuint *d = ((GLuint *) dst); GLuint i; for (i = 0; i < n; i++) { GLuint s = d[i] & 0xff000000; GLuint z = src[i] >> 8; d[i] = s | z; } } break; case MESA_FORMAT_Z_UNORM16: { GLushort *d = ((GLushort *) dst); GLuint i; for (i = 0; i < n; i++) { d[i] = src[i] >> 16; } } break; case MESA_FORMAT_Z_UNORM32: memcpy(dst, src, n * sizeof(GLfloat)); break; case MESA_FORMAT_Z_FLOAT32: { GLuint *d = ((GLuint *) dst); const GLdouble scale = 1.0 / (GLdouble) 0xffffffff; GLuint i; for (i = 0; i < n; i++) { d[i] = (GLuint) (src[i] * scale); assert(d[i] >= 0.0f); assert(d[i] <= 1.0f); } } break; case MESA_FORMAT_Z32_FLOAT_S8X24_UINT: { struct z32f_x24s8 *d = (struct z32f_x24s8 *) dst; const GLdouble scale = 1.0 / (GLdouble) 0xffffffff; GLuint i; for (i = 0; i < n; i++) { d[i].z = (GLfloat) (src[i] * scale); assert(d[i].z >= 0.0f); assert(d[i].z <= 1.0f); } } break; default: _mesa_problem(NULL, "unexpected format in _mesa_pack_uint_z_row()"); } } void _mesa_pack_ubyte_stencil_row(mesa_format format, GLuint n, const GLubyte *src, void *dst) { switch (format) { case MESA_FORMAT_S8_UINT_Z24_UNORM: { /* don't disturb the Z values */ GLuint *d = ((GLuint *) dst); GLuint i; for (i = 0; i < n; i++) { GLuint s = src[i]; GLuint z = d[i] & 0xffffff00; d[i] = z | s; } } break; case MESA_FORMAT_Z24_UNORM_S8_UINT: { /* don't disturb the Z values */ GLuint *d = ((GLuint *) dst); GLuint i; for (i = 0; i < n; i++) { GLuint s = src[i] << 24; GLuint z = d[i] & 0xffffff; d[i] = s | z; } } break; case MESA_FORMAT_S_UINT8: memcpy(dst, src, n * sizeof(GLubyte)); break; case MESA_FORMAT_Z32_FLOAT_S8X24_UINT: { struct z32f_x24s8 *d = (struct z32f_x24s8 *) dst; GLuint i; for (i = 0; i < n; i++) { d[i].x24s8 = src[i]; } } break; default: _mesa_problem(NULL, "unexpected format in _mesa_pack_ubyte_stencil_row()"); } } /** * Incoming Z/stencil values are always in uint_24_8 format. */ void _mesa_pack_uint_24_8_depth_stencil_row(mesa_format format, GLuint n, const GLuint *src, void *dst) { switch (format) { case MESA_FORMAT_S8_UINT_Z24_UNORM: memcpy(dst, src, n * sizeof(GLuint)); break; case MESA_FORMAT_Z24_UNORM_S8_UINT: { GLuint *d = ((GLuint *) dst); GLuint i; for (i = 0; i < n; i++) { GLuint s = src[i] << 24; GLuint z = src[i] >> 8; d[i] = s | z; } } break; case MESA_FORMAT_Z32_FLOAT_S8X24_UINT: { const GLdouble scale = 1.0 / (GLdouble) 0xffffff; struct z32f_x24s8 *d = (struct z32f_x24s8 *) dst; GLuint i; for (i = 0; i < n; i++) { GLfloat z = (GLfloat) ((src[i] >> 8) * scale); d[i].z = z; d[i].x24s8 = src[i]; } } break; default: _mesa_problem(NULL, "bad format %s in _mesa_pack_ubyte_s_row", _mesa_get_format_name(format)); return; } } /** * Convert a boolean color mask to a packed color where each channel of * the packed value at dst will be 0 or ~0 depending on the colorMask. */ void _mesa_pack_colormask(mesa_format format, const GLubyte colorMask[4], void *dst) { GLfloat maskColor[4]; switch (_mesa_get_format_datatype(format)) { case GL_UNSIGNED_NORMALIZED: /* simple: 1.0 will convert to ~0 in the right bit positions */ maskColor[0] = colorMask[0] ? 1.0f : 0.0f; maskColor[1] = colorMask[1] ? 1.0f : 0.0f; maskColor[2] = colorMask[2] ? 1.0f : 0.0f; maskColor[3] = colorMask[3] ? 1.0f : 0.0f; _mesa_pack_float_rgba_row(format, 1, (const GLfloat (*)[4]) maskColor, dst); break; case GL_SIGNED_NORMALIZED: case GL_FLOAT: /* These formats are harder because it's hard to know the floating * point values that will convert to ~0 for each color channel's bits. * This solution just generates a non-zero value for each color channel * then fixes up the non-zero values to be ~0. * Note: we'll need to add special case code if we ever have to deal * with formats with unequal color channel sizes, like R11_G11_B10. * We issue a warning below for channel sizes other than 8,16,32. */ { GLuint bits = _mesa_get_format_max_bits(format); /* bits per chan */ GLuint bytes = _mesa_get_format_bytes(format); GLuint i; /* this should put non-zero values into the channels of dst */ maskColor[0] = colorMask[0] ? -1.0f : 0.0f; maskColor[1] = colorMask[1] ? -1.0f : 0.0f; maskColor[2] = colorMask[2] ? -1.0f : 0.0f; maskColor[3] = colorMask[3] ? -1.0f : 0.0f; _mesa_pack_float_rgba_row(format, 1, (const GLfloat (*)[4]) maskColor, dst); /* fix-up the dst channels by converting non-zero values to ~0 */ if (bits == 8) { GLubyte *d = (GLubyte *) dst; for (i = 0; i < bytes; i++) { d[i] = d[i] ? 0xff : 0x0; } } else if (bits == 16) { GLushort *d = (GLushort *) dst; for (i = 0; i < bytes / 2; i++) { d[i] = d[i] ? 0xffff : 0x0; } } else if (bits == 32) { GLuint *d = (GLuint *) dst; for (i = 0; i < bytes / 4; i++) { d[i] = d[i] ? 0xffffffffU : 0x0; } } else { _mesa_problem(NULL, "unexpected size in _mesa_pack_colormask()"); return; } } break; default: _mesa_problem(NULL, "unexpected format data type in gen_color_mask()"); return; } } """ template = Template(string, future_imports=['division']); print(template.render(argv = argv[0:]))