Add sprite functionality, doesn't render yet

Dengine.vcxproj

@@ -124,12 +124,15 @@
     <ClCompile Include="src\dengine.cpp" />
     <ClCompile Include="src\Game.cpp" />
     <ClCompile Include="src\Shader.cpp" />
+    <ClCompile Include="src\Sprite.cpp" />
     <ClCompile Include="src\Texture.cpp" />
     <ClCompile Include="src\Tutorial.cpp" />
   </ItemGroup>
   <ItemGroup>
     <None Include="data\shaders\default.frag.glsl" />
     <None Include="data\shaders\default.vert.glsl" />
+    <None Include="data\shaders\sprite.frag.glsl" />
+    <None Include="data\shaders\sprite.vert.glsl" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="src\include\Dengine\AssetManager.h" />
@@ -137,6 +140,7 @@
     <ClInclude Include="src\include\Breakout\Game.h" />
     <ClInclude Include="src\include\Dengine\OpenGL.h" />
     <ClInclude Include="src\include\Dengine\Shader.h" />
+    <ClInclude Include="src\include\Dengine\Sprite.h" />
     <ClInclude Include="src\include\Dengine\Texture.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />

Dengine.vcxproj.filters

@@ -33,10 +33,15 @@
     <ClCompile Include="src\Tutorial.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="src\Sprite.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="data\shaders\default.vert.glsl" />
     <None Include="data\shaders\default.frag.glsl" />
+    <None Include="data\shaders\sprite.vert.glsl" />
+    <None Include="data\shaders\sprite.frag.glsl" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="src\include\Dengine\Common.h">
@@ -57,5 +62,8 @@
     <ClInclude Include="src\include\Breakout\Game.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="src\include\Dengine\Sprite.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>

data/shaders/sprite.frag.glsl

@@ -0,0 +1,11 @@
+#version 330 core
+in vec2 texCoord;
+
+out vec4 color;
+
+uniform sampler2D texture;
+
+void main()
+{
+	color = texture(texture, texCoord);
+}

data/shaders/sprite.vert.glsl

@@ -0,0 +1,10 @@
+#version 330 core
+layout (location = 0) in vec4 data; // (vec2)pos, (vec2)texCoord
+
+out vec2 texCoord;
+
+void main()
+{
+	gl_Position = vec4(data.xy, 0.0f, 1.0f);
+	texCoord = data.zw;
+}

src/Sprite.cpp

@@ -0,0 +1,76 @@
+#include <Dengine\Sprite.h>
+#include <Dengine\OpenGL.h>
+
+namespace Dengine
+{
+
+Sprite::Sprite()
+: mPos(0, 0),
+mTex(nullptr)
+{
+}
+
+Sprite::~Sprite() {}
+
+b32 Sprite::loadSprite(Texture *tex, glm::vec2 pos)
+{
+	if (!tex) return -1;
+	
+	mTex = tex;
+	mPos = pos;
+
+	// NOTE(doyle): We encode in a vec4 (vec2)pos, (vec2)texCoords
+	glm::vec4 spriteVertex[] = {
+		//   x     y       s     t
+		{+0.5f, +0.5f, 1.0f, 1.0f}, // Top right
+		{+0.5f, -0.5f, 1.0f, 0.0f}, // Bottom right
+		{-0.5f, +0.5f, 0.0f, 1.0f}, // Top left
+		{-0.5f, -0.5f, 0.0f, 0.0f}, // Bottom left
+	};
+
+	glGenBuffers(1, &mVbo);
+	glBindBuffer(GL_ARRAY_BUFFER, mVbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(spriteVertex), spriteVertex,
+	             GL_DYNAMIC_DRAW);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+	return 0;
+}
+
+void Sprite::initVertexArrayObject(GLuint vao)
+{
+	// NOTE(doyle): Set the VAO object attributes to match a sprite's
+    // vertex composition
+	glBindVertexArray(vao);
+
+	i32 numElementsInVertex = 4;
+	i32 vertexSize = sizeof(glm::vec4);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, numElementsInVertex, GL_FLOAT, GL_FALSE,
+	                      vertexSize, (GLvoid *)(0));
+
+	/* Unbind */
+	glBindVertexArray(0);
+
+}
+
+void Sprite::render(Shader *shader, GLuint spriteVAO)
+{
+	// NOTE(doyle): Associate the VAO with this sprites VBO
+	glBindVertexArray(spriteVAO);
+	glBindBuffer(GL_ARRAY_BUFFER, mVbo);
+
+	/* Set texture */
+	glActiveTexture(GL_TEXTURE0);
+	mTex->bind();
+	glUniform1i(glGetUniformLocation(shader->mProgram, "texture"), 0);
+
+	/* Render */
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+	// Unbind
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+}
+
+}

src/dengine.cpp

@@ -3,6 +3,7 @@
 #include <Dengine/Common.h>
 #include <Dengine/Shader.h>
 #include <Dengine/AssetManager.h>
+#include <Dengine/Sprite.h>
 
 #include <Breakout/Game.h>
 
@@ -124,6 +125,7 @@ int main()
 
 	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
 	glEnable(GL_CULL_FACE | GL_BLEND);
+
 	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	glCullFace(GL_BACK);
 
@@ -135,9 +137,9 @@ int main()
 	Dengine::AssetManager assetManager;
 	i32 result = 0;
 
-	result = assetManager.loadShaderFiles("data/shaders/default.vert.glsl",
-	                                      "data/shaders/default.frag.glsl",
-	                                      "default");
+	result = assetManager.loadShaderFiles("data/shaders/sprite.vert.glsl",
+	                                      "data/shaders/sprite.frag.glsl",
+	                                      "sprite");
 	if (result) return result;
 
 	/* Load a texture */
@@ -149,13 +151,24 @@ int main()
 	                                       "wall");
 	if (result) return result;
 
+	result = assetManager.loadTextureImage("data/textures/awesomeface.png"
+	                                       , "awesomeface");
+	if (result) return result;
+
 	Dengine::Texture *containerTex = assetManager.getTexture("container");
 	Dengine::Texture *wallTex = assetManager.getTexture("wall");
-	Dengine::Shader *shader = assetManager.getShader("default");
+	Dengine::Shader *shader = assetManager.getShader("sprite");
+	Dengine::Texture *awesomeTex = assetManager.getTexture("awesomeface");
 
 	f32 deltaTime = 0.0f; // Time between current frame and last frame
 	f32 lastFrame = 0.0f; // Time of last frame
 
+	GLuint spriteVao;
+	glGenVertexArrays(1, &spriteVao);
+	Dengine::Sprite sprite = Dengine::Sprite();
+	sprite.loadSprite(awesomeTex, glm::vec2(0, 0));
+	sprite.initVertexArrayObject(spriteVao);
+
 	/* Main game loop */
 	while (!glfwWindowShouldClose(window))
 	{
@@ -176,6 +189,8 @@ int main()
 		shader->use();
 		game.render();
 
+		sprite.render(shader, spriteVao);
+
 		/* Swap the buffers */
 		glfwSwapBuffers(window);
 	}

src/include/Dengine/Sprite.h

@@ -0,0 +1,27 @@
+#ifndef DENGINE_SPRITE_H
+#define DENGINE_SPRITE_H
+
+#include <Dengine\Common.h>
+#include <Dengine\Texture.h>
+#include <Dengine\Shader.h>
+#include <GLM\glm.hpp>
+
+namespace Dengine {
+class Sprite
+{
+public:
+	Sprite();
+	~Sprite();
+
+	b32 loadSprite(Texture *tex, glm::vec2 pos);
+
+	void initVertexArrayObject(GLuint vao);
+	void render(Shader *shader, GLuint shaderVao);
+private:
+	glm::vec2 mPos;
+	Texture *mTex;
+	GLuint mVbo;
+};
+}
+
+#endif