Merge pull request #13 from DominicDolan/develop

Merging to master

Author: DominicDolan

CONTRIBUTING.md

@@ -0,0 +1,31 @@
+# Introduction
+
+Thank you for considering contributing to Mechanica.
+
+This project is very new and it is just now being released as open source.
+For that reason we don't have a full cohesive plan just yet. We mainly
+just want to make sure everything is working the way we want it to.
+
+Saying that, there is still a lot of work to do going forward.
+So if you do have an idea or a suggestion, or you found a bug,
+feel free to create an issue in the issue tracker.
+
+# Filing Bug Reports
+
+When filing a bug report, make sure to include the following where necessary:
+
+1. What operating system are you using?
+2. What version of Kotlin are you using?
+3. What version of the JDK did you use to compile?
+4. What did you do and can you recreate the bug consistently?
+5. What did you expect to see or why do you think this is a bug?
+
+# Suggesting Features or Enhancements
+
+Because this is a very new project, there are a lot of
+features and enhancements to be added.
+
+Right now there is not a solid plan in place for what features we
+are looking for but if you have an idea feel free to create an issue
+and make sure to describe the reasons, motivation and benefits of such
+a feature

LICENSE

@@ -0,0 +1,21 @@
+MIT License (MIT)
+
+Copyright (c) 2020 Dominic Dolan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

README.md

@@ -1,16 +1,25 @@
 ## Mechanica, a 2D Game Engine in Kotlin
+
 A powerful 2D Game Engine written in Kotlin. This project is still under development and it is not 
-thoroughly tested or documented but feel free to try it out nonetheless
+thoroughly tested or documented but feel free to try it out nonetheless.
+
+Get started coding games by checking out the [Wiki](https://github.com/DominicDolan/Mechanica/wiki)
+or consider [Contributing](https://github.com/DominicDolan/Mechanica/blob/master/CONTRIBUTING.md)
+
+### Building from source with Gradle
+
+Clone or download the repository and build with gradle.
+
+Building it will require java 12 or later and note that later versions of Java require the latest version of Gradle.
 
-### Setting up the project with Gradle
-Clone or download the repository and build with gradle
+Try and run one of the samples in the samples module to check that everything is working.
 
-Create a new Project with gradle. In the `settings.gradle` file add:
+To create a new project using this repository, create a new Gradle project and In the `settings.gradle.kts` file add:
 
 ```kotlin
 includeBuild("C:/path/to/mechanica")
 ```
-And in the `build.gradle` file add a dependency on the project:
+And in the `build.gradle.kts` file add a dependency on the project:
 ```kotlin
 dependencies {
     implementation("com.mechanica.engine:mechanica:1.0")

application-interface/src/main/kotlin/com/mechanica/engine/context/Application.kt

@@ -4,10 +4,12 @@ import com.mechanica.engine.display.Window
 
 interface Application {
 
-    fun initialize(window: Window)
+    fun initialize(mainWindow: Window)
 
     fun terminate()
 
     fun startFrame()
 
+    fun activateContext(window: Window?)
+
 }

application-interface/src/main/kotlin/com/mechanica/engine/context/loader/DisplayLoader.kt

@@ -5,9 +5,9 @@ import com.mechanica.engine.display.Monitor
 import com.mechanica.engine.display.Window
 
 interface DisplayLoader {
-    fun createWindow(title: String, width: Int, height: Int): Window
-    fun createWindow(title: String, monitor: Monitor): Window
-    fun createWindow(title: String, width: Int, height: Int, monitor: Monitor): Window
+    fun createWindow(title: String, width: Int, height: Int, sharedWith: Window? = null): Window
+    fun createWindow(title: String, monitor: Monitor, sharedWith: Window? = null): Window
+    fun createWindow(title: String, width: Int, height: Int, monitor: Monitor, sharedWith: Window? = null): Window
 
     val allMonitors: Array<out Monitor>
 

application-interface/src/main/kotlin/com/mechanica/engine/context/loader/FontLoader.kt

@@ -1,11 +1,10 @@
 package com.mechanica.engine.context.loader
 
-import com.mechanica.engine.text.Font
 import com.mechanica.engine.resources.Resource
+import com.mechanica.engine.text.Font
 import com.mechanica.engine.text.FontAtlasConfiguration
 
 interface FontLoader {
-    val defaultFont: Font
     fun font(res: Resource, initializer: FontAtlasConfiguration.() -> Unit): Font
 
 }

application-interface/src/main/kotlin/com/mechanica/engine/context/loader/GLDrawerLoader.kt

@@ -0,0 +1,135 @@
+package com.mechanica.engine.context.loader
+
+import com.mechanica.engine.models.Model
+import java.nio.IntBuffer
+
+interface GLDrawerLoader {
+    /**
+     * Defines a sequence of geometric primitives using [model]'s
+     * elements, whose indices are stored in the buffer bound to the
+     * GL_ELEMENT_ARRAY_BUFFER buffer
+     */
+    fun drawElements(model: Model)
+
+    /**
+     * Behaves identically to glDrawElements() except that the ith element
+     * transferred by the corresponding draw command will be taken from
+     * element indices`[i]` + basevertex of each enabled vertex attribute array.
+     */
+    @Suppress("KDocUnresolvedReference")
+    fun drawElementsBaseVertex(model: Model, baseVertex: Int)
+
+    /**
+     * This is a restricted form of glDrawElements() in that it forms a contract
+     * between the application (i.e., you) and OpenGL that guarantees that any
+     * index contained in the section of the element array buffer referenced by
+     * indices and model.vertexCount will fall within the range specified by start and end.
+     */
+    fun drawRangeElements(model: Model, start: Int, end: Int)
+
+    /**
+     * Forms a contractual agreement between the application similar to that of
+     * [drawRangeElements], while allowing the base vertex to be specified in
+     * basevertex. In this case, the contract states that the values stored in the
+     * element array buffer will fall between start and end before basevertex is added.
+     */
+    fun drawRangeElementsBaseVertex(model: Model, start: Int, end: Int, baseVertex: Int)
+
+    /**
+     * Behaves exactly as [drawElements], except that the parameters for the
+     * drawing command are taken from a structure stored in the buffer bound
+     * to the GL_DRAW_INDIRECT_BUFFER binding point.
+     */
+    fun drawElementsIndirect(model: Model)
+
+    /**
+     * Draws multiple sets of geometric primitives with a single OpenGL
+     * function call.
+     */
+    fun multiDrawElements(models: Array<Model>)
+
+    /**
+     * Draws multiple sets of geometric primitives with a single OpenGL
+     * function call. first, indices, and baseVertex are arrays of primcount
+     * parameters that would be valid for a call to
+     * glDrawElementsBaseVertex().
+     */
+    fun multiDrawElementsBaseVertex(models: Array<Model>, baseVertex: IntBuffer)
+
+    /**
+     * The same as [multiDrawElementsBaseVertex] but the same [baseVertex] is
+     * passed in for every primitive
+     */
+    fun multiDrawElementsBaseVertex(models: Array<Model>, baseVertex: Int)
+
+    /**
+     * Draws primCount instances of the geometric primitives specified by [model]
+     * as if specified by individual calls to [drawElements].
+     * As with [drawArraysInstanced], the built-in variable gl_InstanceID
+     * is incremented for each instance, and new values are presented to the
+     * vertex shader for each instanced vertex attribute.
+     */
+    fun drawElementsInstanced(model: Model, instanceCount: Int)
+
+    /**
+     * Draws [instanceCount] instances of the geometric primitives specified by [model]
+     * and [baseVertex] as if specified by individual calls to
+     * [drawElementsBaseVertex]. As with [drawArraysInstanced], the
+     * built-in variable gl_InstanceID is incremented for each instance, and
+     * new values are presented to the vertex shader for each instanced vertex
+     * attribute.
+     */
+    fun drawElementsInstancedBaseVertex(model: Model, instanceCount: Int, baseVertex: Int)
+
+    /**
+     * Draws [instanceCount] instances of the geometric primitives specified by [model]
+     * as if specified by individual calls to [drawElements].
+     * As with [drawArraysInstanced], the built-in variable gl_InstanceID
+     * is incremented for each instance, and new values are presented to the
+     * vertex shader for each instanced vertex attribute. Furthermore, the
+     * implied index used to fetch any instanced vertex attributes is offset by
+     * the value of [baseInstance] by OpenGL.
+     */
+    fun drawElementsInstancedBaseInstance(model: Model, instanceCount: Int, baseInstance: Int)
+
+
+    /**
+     * Constructs a sequence of geometric primitives using array elements
+     * specified within [model]
+     */
+    fun drawArrays(model: Model)
+
+    /**
+     * Behaves exactly as [drawArraysInstanced], except that the parameters
+     * for the drawing command are taken from a structure stored in the buffer
+     * bound to the GL_DRAW_INDIRECT_BUFFER binding point (the draw
+     * indirect buffer)
+     */
+    fun drawArraysIndirect(model: Model)
+
+    /**
+     * Draws multiple sets of geometric primitives with a single OpenGL
+     * function call.
+     */
+    fun multiDrawArrays(models: Array<Model>)
+
+    /**
+     * Draws [instanceCount] instances of the geometric primitives specified by [model]
+     * as if specified by individual calls to [drawArrays]. The
+     * built-in variable gl_InstanceID is incremented for each instance, and
+     * new values are presented to the vertex shader for each instanced vertex
+     * attribute.
+     */
+    fun drawArraysInstanced(model: Model, instanceCount: Int)
+
+    /**
+     * Draws [instanceCount] instances of the geometric primitives specified by [model]
+     * as if specified by individual calls to [drawArrays]. The
+     * built-in variable gl_InstanceID is incremented for each instance, and
+     * new values are presented to the vertex shader for each instanced vertex
+     * attribute. Furthermore, the implied index used to fetch any instanced
+     * vertex attributes is offset by the value of [baseInstance] by OpenGL.
+     */
+    fun drawArraysInstancedBaseInstance(model: Model, instanceCount: Int, baseInstance: Int)
+
+}

application-interface/src/main/kotlin/com/mechanica/engine/context/loader/GraphicsLoader.kt

@@ -1,15 +1,17 @@
 package com.mechanica.engine.context.loader
 
 import com.mechanica.engine.models.Image
-import com.mechanica.engine.models.Model
 import com.mechanica.engine.resources.Resource
 
 interface GraphicsLoader {
 
+    val glDrawer: GLDrawerLoader
+
     fun loadImage(id: Int): Image
     fun loadImage(res: Resource): Image
 
-    fun drawArrays(model: Model)
-    fun drawElements(model: Model)
-
+    val glPointDrawer: GLDrawerLoader
+    val glLineLoopDrawer: GLDrawerLoader
+    val glLinesDrawer: GLDrawerLoader
+    val glLineStripDrawer: GLDrawerLoader
 }

application-interface/src/main/kotlin/com/mechanica/engine/display/Window.kt

@@ -51,16 +51,16 @@ interface Window {
     }
 
     companion object {
-        fun create(title: String, width: Int, height: Int): Window {
-            return DisplayLoader.createWindow(title, width, height)
+        fun create(title: String, width: Int, height: Int, sharedWith: Window? = null): Window {
+            return DisplayLoader.createWindow(title, width, height, sharedWith)
         }
 
-        fun create(title: String, monitor: Monitor): Window {
-            return DisplayLoader.createWindow(title, monitor)
+        fun create(title: String, monitor: Monitor, sharedWith: Window? = null): Window {
+            return DisplayLoader.createWindow(title, monitor, sharedWith)
         }
 
-        fun create(title: String, width: Int, height: Int, monitor: Monitor): Window {
-            return DisplayLoader.createWindow(title, width, height, monitor)
+        fun create(title: String, width: Int, height: Int, monitor: Monitor, sharedWith: Window? = null): Window {
+            return DisplayLoader.createWindow(title, width, height, monitor, sharedWith)
         }
     }
 }

application-interface/src/main/kotlin/com/mechanica/engine/graphics/BaseVertex.kt

@@ -0,0 +1,40 @@
+package com.mechanica.engine.graphics
+
+import com.mechanica.engine.context.loader.GLDrawerLoader
+import com.mechanica.engine.models.Model
+import java.nio.IntBuffer
+
+
+class DrawBaseVertex(private val glDrawCommands: GLDrawerLoader) : ElementsDrawCommand, MultiElementsDrawCommand {
+    var baseVertex: Int = 0
+
+    override fun elements(model: Model) {
+        glDrawCommands.drawElementsBaseVertex(model, baseVertex)
+    }
+
+    override fun elements(models: Array<Model>) {
+        glDrawCommands.multiDrawElementsBaseVertex(models, baseVertex)
+    }
+}
+
+class MultiDrawBaseVertex(private val glDrawCommands: GLDrawerLoader) : MultiElementsDrawCommand {
+    var baseVertex: IntBuffer? = null
+
+    override fun elements(models: Array<Model>) {
+        val buffer = baseVertex
+        if (buffer != null) {
+            glDrawCommands.multiDrawElementsBaseVertex(models, buffer)
+        }
+    }
+}
+
+class DrawRangeBaseVertex(
+        private val glDrawCommands: GLDrawerLoader,
+        private val drawRange: DrawRange): ElementsDrawCommand {
+    internal var baseVertex: Int = 0
+
+    override fun elements(model: Model) {
+        glDrawCommands.drawRangeElementsBaseVertex(model, drawRange.start, drawRange.end, baseVertex)
+    }
+
+}

application-interface/src/main/kotlin/com/mechanica/engine/graphics/DrawCommands.kt

@@ -0,0 +1,31 @@
+package com.mechanica.engine.graphics
+
+import com.mechanica.engine.models.Model
+
+interface ArrayDrawCommand {
+    fun arrays(model: Model)
+}
+
+interface ElementsDrawCommand {
+    fun elements(model: Model)
+}
+
+interface MultiArrayDrawCommand {
+    fun arrays(models: Array<Model>)
+}
+
+interface MultiElementsDrawCommand {
+    fun elements(models: Array<Model>)
+}
+
+interface DrawCommands : ArrayDrawCommand, ElementsDrawCommand {
+    fun model(model: Model) {
+        if (model.hasIndexArray) {
+            elements(model)
+        } else {
+            arrays(model)
+        }
+    }
+}
+
+interface MultiDrawCommands : DrawCommands, MultiArrayDrawCommand, MultiElementsDrawCommand