zakarya/puzzles
1
0
Fork 0
mirror of git://git.tartarus.org/simon/puzzles.git synced 2025-04-22 08:25:45 -07:00
Code Issues Packages Projects Releases Wiki Activity

Add draw_polygon_fallback() for platforms without a native polygon fill.

Browse Source 
This adds a portable, scanline-based polygon filling algorithm, which
fills a polygon by drawing a collection of adjacent horizontal lines.

This change is motivated by the Rockbox port's current lack of a true
polygon fill capability. Until now, it attempted to approximate a
polygon fill by performing a series of triangle fills, but this worked
reliably only for convex polygons. I originally considered making this
new rasterizer part of the Rockbox front end itself, but I ultimately
decided that it made more sense to include it here, in the Puzzles
distribution, where other platforms may benefit from it in the future.

No in-tree front ends use this new function quite yet, but I plan to
follow this commit with a compile-time option to force front ends to
use it for testing.

This new polygon drawing code also comes with its own standalone
driver code to test it out in isolation. This code currently relies on
SDL 2.0 to present a GUI window to the user, which unfortunately adds
a build-time dependency. To lessen the impact of this change, this
program is gated behind a CMake build option. To use it, run:

$ cmake -DBUILD_SDL_PROGRAMS=true
This commit is contained in:
Franklin Wei
2024-08-11 20:52:52 -04:00
committed by Simon Tatham
parent 4149f2cb9c
commit 989df5d2bf
6 changed files with 359 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
cmake/setup.cmake
View File

@ -7,6 +7,7 @@ set(build_cli_programs TRUE)
set(build_gui_programs TRUE)
set(build_icons FALSE)
set(need_c_icons FALSE)
option(BUILD_SDL_PROGRAMS "build test programs requiring SDL" FALSE)
# Don't disable assertions, even in release mode. Our assertions
# generally aren't expensive and protect against more annoying crashes
@ -148,7 +149,7 @@ endfunction()
# a command-line helper tool.
function(cliprogram NAME)
cmake_parse_arguments(OPT
"CORE_LIB" "" "COMPILE_DEFINITIONS" ${ARGN})
"CORE_LIB;SDL2_LIB" "" "COMPILE_DEFINITIONS" ${ARGN})
if(OPT_CORE_LIB)
set(lib core)
@ -156,13 +157,18 @@ function(cliprogram NAME)
set(lib common)
endif()
if(build_cli_programs)
if(build_cli_programs AND ((NOT OPT_SDL2_LIB) OR BUILD_SDL_PROGRAMS))
add_executable(${NAME} ${CMAKE_SOURCE_DIR}/nullfe.c
${OPT_UNPARSED_ARGUMENTS})
target_link_libraries(${NAME} ${lib} ${platform_libs})
if(OPT_COMPILE_DEFINITIONS)
target_compile_definitions(${NAME} PRIVATE ${OPT_COMPILE_DEFINITIONS})
endif()
if(OPT_SDL2_LIB)
find_package(SDL2 REQUIRED)
include_directories(${NAME} ${SDL2_INCLUDE_DIRS})
target_link_libraries(${NAME} ${SDL2_LIBRARIES})
endif()
endif()
endfunction()