Switch shader storage to char arrays
This commit is contained in:
Marek Roszko
parent
bf4b3a1ff8
commit
6d7835e742
|
|
@ -1,54 +1,83 @@
|
|||
file( READ ${SOURCE} SOURCE_TEXT )
|
||||
file( SIZE ${SOURCE} SOURCE_FILESIZE )
|
||||
#
|
||||
# Converts provided shader files into the gal namespaced shaders
|
||||
#
|
||||
# The goal here is to convert the contents of shaders in the source tree
|
||||
# into strings to embed into the binaries rather than loading from disk.
|
||||
#
|
||||
# We convert the shaders to binary form in the header due limitations of string literal
|
||||
# lengths and also because future development options such as moving to bgfx
|
||||
# results in precompiled binary shaders we need to store
|
||||
#
|
||||
# This file is structured to be invoked from add_custom_command in order
|
||||
# to have GENERATED marked output files that can be rebuilt on change.
|
||||
#
|
||||
# Required Arguments:
|
||||
# SOURCE_FILE - Path to source shader file
|
||||
# OUT_CPP_DIR - Destination path for cpp file
|
||||
# OUT_HEADER_DIR - Destination path for header file
|
||||
# OUT_CPP_FILENAME - cpp filename
|
||||
# OUT_HEADER_FILENAME - header filename
|
||||
# OUT_VAR_NAME - Name of variable containing shader to be created
|
||||
#
|
||||
# Parts taken from https://github.com/sivachandran/cmake-bin2h
|
||||
# Copyright 2020 Sivachandran Paramasivam
|
||||
#
|
||||
|
||||
set( MAX_BYTES_PER_LITERAL 16000 )
|
||||
# Function to wrap a given string into multiple lines at the given column position.
|
||||
# Parameters:
|
||||
# VARIABLE - The name of the CMake variable holding the string.
|
||||
# AT_COLUMN - The column position at which string will be wrapped.
|
||||
function(WRAP_STRING)
|
||||
set(oneValueArgs VARIABLE AT_COLUMN)
|
||||
cmake_parse_arguments(WRAP_STRING "${options}" "${oneValueArgs}" "" ${ARGN})
|
||||
|
||||
math(EXPR NUMBER_LITERALS "${SOURCE_FILESIZE}/${MAX_BYTES_PER_LITERAL}")
|
||||
string(LENGTH ${${WRAP_STRING_VARIABLE}} stringLength)
|
||||
math(EXPR offset "0")
|
||||
|
||||
while(stringLength GREATER 0)
|
||||
|
||||
if(stringLength GREATER ${WRAP_STRING_AT_COLUMN})
|
||||
math(EXPR length "${WRAP_STRING_AT_COLUMN}")
|
||||
else()
|
||||
math(EXPR length "${stringLength}")
|
||||
endif()
|
||||
|
||||
string(SUBSTRING ${${WRAP_STRING_VARIABLE}} ${offset} ${length} line)
|
||||
set(lines "${lines}\n${line}")
|
||||
|
||||
math(EXPR stringLength "${stringLength} - ${length}")
|
||||
math(EXPR offset "${offset} + ${length}")
|
||||
endwhile()
|
||||
|
||||
set(${WRAP_STRING_VARIABLE} "${lines}" PARENT_SCOPE)
|
||||
endfunction()
|
||||
|
||||
|
||||
set( outCppTextStdString "std::string ${OUTVARNAME} = ")
|
||||
file( READ ${SOURCE_FILE} _SOURCE_BINARY HEX )
|
||||
string(LENGTH ${_SOURCE_BINARY} _SOURCE_BINARY_LENGTH)
|
||||
|
||||
set(SOURCE_BINARY "${_SOURCE_BINARY}00") # null terminate for the sake of it
|
||||
|
||||
wrap_string(VARIABLE _SOURCE_BINARY AT_COLUMN 32)
|
||||
math(EXPR _ARRAY_SIZE "${_SOURCE_BINARY_LENGTH} / 2")
|
||||
|
||||
|
||||
# adds '0x' prefix and comma suffix before and after every byte respectively
|
||||
string(REGEX REPLACE "([0-9a-f][0-9a-f])" "0x\\1, " _ARRAY_VALUES ${_SOURCE_BINARY})
|
||||
# removes trailing comma
|
||||
string(REGEX REPLACE ", $" "" _ARRAY_VALUES ${_ARRAY_VALUES})
|
||||
|
||||
set( outCppTextByteArray "unsigned char ${OUT_VAR_NAME}_bytes[] = { ${_ARRAY_VALUES} };")
|
||||
set( outCppTextStdString "std::string ${OUT_VAR_NAME} = std::string( reinterpret_cast<char const*>(${OUT_VAR_NAME}_bytes), ${_ARRAY_SIZE} ) ;")
|
||||
|
||||
set( outCppText
|
||||
"
|
||||
#include <string>
|
||||
#include <${OUTHEADERFILE}>
|
||||
#include <${OUT_HEADER_FILENAME}>
|
||||
|
||||
namespace KIGFX {
|
||||
namespace BUILTIN_SHADERS {
|
||||
")
|
||||
|
||||
|
||||
MATH(EXPR LAST_LITERAL_ITER "${NUMBER_LITERALS}-1")
|
||||
|
||||
foreach(LITERAL_ITER RANGE 0 ${NUMBER_LITERALS} 1)
|
||||
set( CHUNK_TEXT "" )
|
||||
|
||||
MATH(EXPR TEXT_OFFSET "${LITERAL_ITER}*${MAX_BYTES_PER_LITERAL}")
|
||||
|
||||
string(SUBSTRING "${SOURCE_TEXT}" ${TEXT_OFFSET} ${MAX_BYTES_PER_LITERAL} CHUNK_TEXT)
|
||||
|
||||
|
||||
set( outCppText
|
||||
"
|
||||
${outCppText}
|
||||
|
||||
const char ${OUTVARNAME}_p${LITERAL_ITER}[] = R\"SHADER_SOURCE(
|
||||
${CHUNK_TEXT}
|
||||
)SHADER_SOURCE\";
|
||||
|
||||
" )
|
||||
|
||||
set( outCppTextStdString "${outCppTextStdString} std::string(${OUTVARNAME}_p${LITERAL_ITER})")
|
||||
if( ${LITERAL_ITER} LESS_EQUAL ${LAST_LITERAL_ITER})
|
||||
set( outCppTextStdString " ${outCppTextStdString} +")
|
||||
endif()
|
||||
endforeach()
|
||||
|
||||
set( outCppTextStdString "${outCppTextStdString};")
|
||||
|
||||
set( outCppText
|
||||
"
|
||||
${outCppText}
|
||||
${outCppTextByteArray}
|
||||
|
||||
${outCppTextStdString}
|
||||
}
|
||||
|
|
@ -56,7 +85,7 @@ ${outCppTextStdString}
|
|||
" )
|
||||
|
||||
file(
|
||||
WRITE ${DESTINATION_SOURCE_DIR}/${OUTCPPFILE}
|
||||
WRITE ${OUT_CPP_DIR}/${OUT_CPP_FILENAME}
|
||||
"${outCppText}"
|
||||
)
|
||||
|
||||
|
|
@ -64,14 +93,14 @@ file(
|
|||
set( outHeaderText
|
||||
"namespace KIGFX {
|
||||
namespace BUILTIN_SHADERS {
|
||||
extern std::string ${OUTVARNAME};
|
||||
extern std::string ${OUT_VAR_NAME};
|
||||
}
|
||||
}"
|
||||
)
|
||||
|
||||
file(
|
||||
WRITE ${DESTINATION_HEADER_DIR}/${OUTHEADERFILE}
|
||||
WRITE ${OUT_HEADER_DIR}/${OUT_HEADER_FILENAME}
|
||||
"${outHeaderText}"
|
||||
)
|
||||
|
||||
message(STATUS "Shader ${SOURCE} converted to ${DESTINATION_SOURCE_DIR}/${OUTCPPFILE}")
|
||||
message(STATUS "Shader ${SOURCE_FILE} converted to ${OUT_CPP_DIR}/${OUT_CPP_FILENAME}")
|
||||
|
|
@ -65,12 +65,12 @@ function( add_shader outTarget inFile shaderName )
|
|||
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${outCppName}
|
||||
${CMAKE_BINARY_DIR}/include/gal/shaders/${outHeaderName}
|
||||
COMMAND ${CMAKE_COMMAND}
|
||||
-DSOURCE="${CMAKE_CURRENT_SOURCE_DIR}/shaders/${inFile}"
|
||||
-DDESTINATION_SOURCE_DIR="${CMAKE_CURRENT_BINARY_DIR}/"
|
||||
-DDESTINATION_HEADER_DIR="${CMAKE_BINARY_DIR}/include/gal/shaders/"
|
||||
-DOUTCPPFILE="${outCppName}"
|
||||
-DOUTHEADERFILE="${outHeaderName}"
|
||||
-DOUTVARNAME="${shaderName}"
|
||||
-DSOURCE_FILE="${CMAKE_CURRENT_SOURCE_DIR}/shaders/${inFile}"
|
||||
-DOUT_CPP_DIR="${CMAKE_CURRENT_BINARY_DIR}/"
|
||||
-DOUT_HEADER_DIR="${CMAKE_BINARY_DIR}/include/gal/shaders/"
|
||||
-DOUT_CPP_FILENAME="${outCppName}"
|
||||
-DOUT_HEADER_FILENAME="${outHeaderName}"
|
||||
-DOUT_VAR_NAME="${shaderName}"
|
||||
-P ${CMAKE_MODULE_PATH}/BuildSteps/CreateShaderCpp.cmake
|
||||
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/shaders/${inFile}
|
||||
${CMAKE_MODULE_PATH}/BuildSteps/CreateShaderCpp.cmake
|
||||
|
|
|
|||
Loading…
Reference in New Issue