Added Renderer::DrawFullscreenQuad

Made [Color|Texture]Background use a new shader-based algorithm


Former-commit-id: cfd319b33712c270726eb697e258d61db2ca6835

src/Nazara/Graphics/ColorBackground.cpp

@@ -2,21 +2,111 @@
 // This file is part of the "Nazara Engine - Graphics module"
 // For conditions of distribution and use, see copyright notice in Config.hpp
 
-#include <Nazara/Graphics/ColorBackground.hpp>
+#include <Nazara/Renderer/OpenGL.hpp>
+#include <Nazara/Graphics/ColorBackGround.hpp>
 #include <Nazara/Renderer/Renderer.hpp>
+#include <Nazara/Renderer/ShaderBuilder.hpp>
+#include <memory>
 #include <Nazara/Graphics/Debug.hpp>
 
+namespace
+{
+	NzShader* BuildShader()
+	{
+		const char* fragmentSource110 =
+		"#version 110\n"
+		"uniform vec4 Color;\n"
+		"void main()\n"
+		"{\n"
+		"	gl_FragColor = Color;\n"
+		"}\n";
+
+		const char* fragmentSource140 =
+		"#version 140\n"
+		"out vec4 RenderTarget0;\n"
+		"uniform vec4 Color;\n"
+		"void main()\n"
+		"{\n"
+		"	RenderTarget0 = Color;\n"
+		"}\n";
+
+		const char* vertexSource110 =
+		"#version 110\n"
+		"attribute vec2 VertexPosition;\n"
+		"void main()\n"
+		"{\n"
+		"    gl_Position = vec4(VertexPosition, 0.0, 1.0);\n"
+		"}\n";
+
+		const char* vertexSource140 =
+		"#version 140\n"
+		"in vec2 VertexPosition;\n"
+		"void main()\n"
+		"{\n"
+		"    gl_Position = vec4(VertexPosition, 0.0, 1.0);\n"
+		"}\n";
+
+		///TODO: Remplacer ça par des ShaderNode
+		std::unique_ptr<NzShader> shader(new NzShader(nzShaderLanguage_GLSL));
+		shader->SetPersistent(false);
+
+		bool useGLSL140 = (NzOpenGL::GetVersion() >= 310);
+
+		if (!shader->Load(nzShaderType_Fragment, (useGLSL140) ? fragmentSource140 : fragmentSource110))
+		{
+			NazaraError("Failed to load fragment shader");
+			return nullptr;
+		}
+
+		if (!shader->Load(nzShaderType_Vertex, (useGLSL140) ? vertexSource140 : vertexSource110))
+		{
+			NazaraError("Failed to load vertex shader");
+			return nullptr;
+		}
+
+		if (!shader->Compile())
+		{
+			NazaraError("Failed to compile shader");
+			return nullptr;
+		}
+
+		return shader.release();
+	}
+
+	static NzShader* s_shader = nullptr;
+	static unsigned int s_colorLocation;
+}
+
 NzColorBackground::NzColorBackground(const NzColor& color) :
 m_color(color)
 {
+	if (!s_shader)
+	{
+		s_shader = BuildShader();
+		s_colorLocation = s_shader->GetUniformLocation("Color");
+	}
+
+	m_shader = s_shader;
+}
+
+NzColorBackground::~NzColorBackground()
+{
+	if (m_shader.Reset())
+		s_shader = nullptr;
 }
 
 void NzColorBackground::Draw(const NzScene* scene) const
 {
 	NazaraUnused(scene);
 
-	NzRenderer::SetClearColor(m_color);
-	NzRenderer::Clear(nzRendererClear_Color);
+	static NzRenderStates states;
+
+	m_shader->SendColor(s_colorLocation, m_color);
+
+	NzRenderer::SetRenderStates(states);
+	NzRenderer::SetShader(m_shader);
+
+	NzRenderer::DrawFullscreenQuad();
 }
 
 nzBackgroundType NzColorBackground::GetBackgroundType() const
@@ -33,3 +123,4 @@ void NzColorBackground::SetColor(const NzColor& color)
 {
 	m_color = color;
 }
+