examples: Add blending example (#15657)

VisualC/examples/renderer/20-blending/20-blending.vcxproj

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{B938A3C0-6C64-4734-B705-ED3642C01B47}</ProjectGuid>
+  </PropertyGroup>
+  <Import Project="$(SolutionDir)\examples\Examples.props" />
+  <ItemGroup>
+    <None Include="$(SolutionDir)\..\examples\renderer\20-blending\README.txt" />
+    <ClCompile Include="$(SolutionDir)\..\examples\renderer\20-blending\blending.c" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+</Project>

examples/CMakeLists.txt

@@ -142,6 +142,7 @@ add_sdl_example_executable(renderer-cliprect SOURCES renderer/15-cliprect/clipre
 add_sdl_example_executable(renderer-read-pixels SOURCES renderer/17-read-pixels/read-pixels.c DATAFILES ${CMAKE_CURRENT_SOURCE_DIR}/../test/sample.png)
 add_sdl_example_executable(renderer-debug-text SOURCES renderer/18-debug-text/debug-text.c)
 add_sdl_example_executable(renderer-affine-textures SOURCES renderer/19-affine-textures/affine-textures.c DATAFILES ${CMAKE_CURRENT_SOURCE_DIR}/../test/sample.png)
+add_sdl_example_executable(renderer-blending SOURCES renderer/20-blending/blending.c)
 add_sdl_example_executable(audio-simple-playback SOURCES audio/01-simple-playback/simple-playback.c)
 add_sdl_example_executable(audio-simple-playback-callback SOURCES audio/02-simple-playback-callback/simple-playback-callback.c)
 add_sdl_example_executable(audio-load-wav SOURCES audio/03-load-wav/load-wav.c DATAFILES ${CMAKE_CURRENT_SOURCE_DIR}/../test/sample.wav)

examples/renderer/20-blending/README.txt

@@ -0,0 +1,5 @@
+This example uses SDL_SetTextureBlendMode() to apply blending to textures,
+and SDL_ComposeCustomBlendMode() to create a custom blend mode.
+
+You can also use SDL_SetRenderDrawBlendMode() to apply blending to the
+entire renderer, but it only affects filled rects and lines, not texture