[feature] gl: stars (#14) (#44)

src/output/shared/gl/modules/stars/build.cmake

@@ -0,0 +1,46 @@
+# Project default
+option(GL_MODULES "GL_MODULES" ON)
+
+# Xorg
+if(GL_MODULES)
+    # OpenGL/GLEW
+    find_library(GLEW glew32)
+    pkg_check_modules(GLEW QUIET glew)
+    if(GLEW OR GLEW_FOUND)
+        add_library(gl_stars SHARED "${XAVA_MODULE_DIR}/main.c"
+                                    "${XAVA_MODULE_DIR}/../../util/shader.c"
+                                    "${XAVA_MODULE_DIR}/../../util/misc.c"
+                                    "${GLOBAL_FUNCTION_SOURCES}")
+        target_link_directories(gl_stars PRIVATE
+            "${GLEW_LIBRARY_DIRS}")
+        target_include_directories(gl_stars PRIVATE
+            "${GLEW_INCLUDE_DIRS}")
+
+        if(WINDOWS OR MINGW OR MSVC OR CYGWIN)
+            target_link_libraries(gl_stars xava-shared "-lglew32 -lopengl32")
+        else()
+            target_link_libraries(gl_stars xava-shared "${GLEW_LIBRARIES}")
+        endif()
+        target_compile_definitions(gl_stars PUBLIC -DGL)
+
+        set_target_properties(gl_stars PROPERTIES PREFIX "")
+        set_target_properties(gl_stars PROPERTIES IMPORT_PREFIX "")
+        set_target_properties(gl_stars PROPERTIES OUTPUT_NAME "gl/module/stars/module")
+
+        # this copies the dlls for mr. windows
+        #find_and_copy_dlls(gl_stars)
+
+        configure_file("${XAVA_MODULE_DIR}/vertex.glsl"   gl/module/stars/vertex.glsl   COPYONLY)
+        configure_file("${XAVA_MODULE_DIR}/fragment.glsl" gl/module/stars/fragment.glsl COPYONLY)
+        configure_file("${XAVA_MODULE_DIR}/config.ini"    gl/module/stars/config.ini    COPYONLY)
+
+        install(TARGETS gl_stars RENAME module DESTINATION share/xava/gl/module/stars/)
+        install(FILES "${CMAKE_BINARY_DIR}/gl/module/stars/vertex.glsl"   RENAME vertex.glsl.example   DESTINATION share/xava/gl/module/stars/)
+        install(FILES "${CMAKE_BINARY_DIR}/gl/module/stars/fragment.glsl" RENAME fragment.glsl.example DESTINATION share/xava/gl/module/stars/)
+        install(FILES "${CMAKE_BINARY_DIR}/gl/module/stars/config.ini"    RENAME config.ini.example    DESTINATION share/xava/gl/module/stars/)
+
+        # Maybe GL license?
+    else()
+        message(WARNING "GLEW library not found; \"gl_stars\" won't build")
+    endif()
+endif()

src/output/shared/gl/modules/stars/config.ini

@@ -0,0 +1,25 @@
+# Config options related to the "stars" gl module
+# Remove ';' for the config options to apply
+
+[stars]
+
+# Change star color in AARRGGB hex fashion
+; color = "#ffffffff"
+
+# Set a specific number of stars. If enabled, "density" will stop working.
+; count = 100
+
+# Control density of stars on the screen. Calculates the number of stars
+# relative to screen resolution and this is just a simple scalar to that
+# WARNING: Setting this value too high may cause graphical glitches due
+# to Cairo draw limits
+; density = 1.0
+
+# Set maximum star size (in pixels)
+; max_size = 5
+
+# Enable/disable depth test for the stars.
+# This is used for cases where the depth buffer is undesired for the stars, such
+# as when using the shadow post shader.
+; depth_test = false
+

src/output/shared/gl/modules/stars/fragment.glsl

@@ -0,0 +1,19 @@
+#version 420 core
+
+// color passed from the host
+uniform vec4 foreground_color;
+
+// color passed from the host
+uniform vec4 background_color;
+
+// screen width and height
+uniform vec2 resolution;
+
+uniform float intensity;
+
+layout(location=0) out vec4 FragColor;
+
+void main() {
+	FragColor = foreground_color;
+}
+