Add OpenGL quad integration test with texture mapping

- Add tests/RHI/OpenGL/integration/quad/ with main.cpp, CMakeLists.txt
- Add GLSL shaders (quad.vert, quad.frag) for textured quad rendering
- Use OpenGLVertexArray, OpenGLBuffer, OpenGLShader, OpenGLPipelineState
- Add OpenGLTexture::LoadFromFile for texture loading (earth.png)
- Add OpenGLSampler for texture sampling configuration
- Disable depth test for 2D quad rendering
- GT.ppm generated from OpenGL rendering output (0% diff on re-run)

tests/RHI/OpenGL/integration/quad/CMakeLists.txt

@@ -0,0 +1,57 @@
+cmake_minimum_required(VERSION 3.15)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+
+project(OpenGL_Quad)
+
+set(ENGINE_ROOT_DIR ${CMAKE_SOURCE_DIR}/engine)
+set(PACKAGE_DIR ${CMAKE_SOURCE_DIR}/tests/OpenGL/package)
+
+add_executable(OpenGL_Quad
+    WIN32
+    main.cpp
+    ${PACKAGE_DIR}/src/glad.c
+)
+
+target_include_directories(OpenGL_Quad PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${ENGINE_ROOT_DIR}/include
+    ${PACKAGE_DIR}/include
+)
+
+target_link_libraries(OpenGL_Quad PRIVATE
+    opengl32
+    XCEngine
+)
+
+target_compile_definitions(OpenGL_Quad PRIVATE
+    UNICODE
+    _UNICODE
+)
+
+add_custom_command(TARGET OpenGL_Quad POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy_directory
+        ${CMAKE_CURRENT_SOURCE_DIR}/Res
+        $<TARGET_FILE_DIR:OpenGL_Quad>/Res
+)
+
+add_custom_command(TARGET OpenGL_Quad POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${CMAKE_SOURCE_DIR}/tests/RHI/OpenGL/integration/run_integration_test.py
+        $<TARGET_FILE_DIR:OpenGL_Quad>/
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${CMAKE_SOURCE_DIR}/tests/RHI/OpenGL/integration/compare_ppm.py
+        $<TARGET_FILE_DIR:OpenGL_Quad>/
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${CMAKE_CURRENT_SOURCE_DIR}/GT.ppm
+        $<TARGET_FILE_DIR:OpenGL_Quad>/
+)
+
+add_test(NAME OpenGL_Quad_Integration
+    COMMAND ${Python3_EXECUTABLE} $<TARGET_FILE_DIR:OpenGL_Quad>/run_integration_test.py
+        $<TARGET_FILE:OpenGL_Quad>
+        quad.ppm
+        ${CMAKE_CURRENT_SOURCE_DIR}/GT.ppm
+        5
+    WORKING_DIRECTORY $<TARGET_FILE_DIR:OpenGL_Quad>
+)