From 0ea658cefa0f9b1dac8ead9572559228e117dbb5 Mon Sep 17 00:00:00 2001
From: hyzboy <hyzboy@gmail.com>
Date: Fri, 7 Dec 2018 19:39:00 +0800
Subject: [PATCH] =?UTF-8?q?=E5=88=9B=E5=A7=8BDirectGLTexture=E5=88=9D?=
 =?UTF-8?q?=E5=A7=8B=E5=B7=A5=E7=A8=8B?=
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---
 example/CMakeLists.txt                 |   1 +
 example/DirectGLTexture/CMakeLists.txt |   4 +
 example/DirectGLTexture/main.cpp       | 178 +++++++++++++++++++++++++
 3 files changed, 183 insertions(+)
 create mode 100644 example/DirectGLTexture/CMakeLists.txt
 create mode 100644 example/DirectGLTexture/main.cpp

diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
index f869b0ff..1e07a0d2 100644
--- a/example/CMakeLists.txt
+++ b/example/CMakeLists.txt
@@ -2,4 +2,5 @@
 add_subdirectory(OutputGLInfo)
 add_subdirectory(NullWindow)
 add_subdirectory(DirectGLRender)
+add_subdirectory(DirectGLTexture)
 # add_subdirectory(DrawTriangle)
diff --git a/example/DirectGLTexture/CMakeLists.txt b/example/DirectGLTexture/CMakeLists.txt
new file mode 100644
index 00000000..09cad961
--- /dev/null
+++ b/example/DirectGLTexture/CMakeLists.txt
@@ -0,0 +1,4 @@
+add_executable(DirectGLTexture main.cpp)
+
+target_link_libraries(DirectGLTexture PRIVATE ${ULRE})
+
diff --git a/example/DirectGLTexture/main.cpp b/example/DirectGLTexture/main.cpp
new file mode 100644
index 00000000..302b26c8
--- /dev/null
+++ b/example/DirectGLTexture/main.cpp
@@ -0,0 +1,178 @@
+#include<hgl/graph/RenderDevice.h>
+#include<hgl/graph/RenderDriver.h>
+#include<hgl/graph/RenderWindow.h>
+#include<iostream>
+#include<GLEWCore/glew.h>
+#include<hgl/graph/Shader.h>
+#include<hgl/math/Math.h>
+#include<hgl/graph/VertexArray.h>
+
+using namespace hgl;
+using namespace hgl::graph;
+
+constexpr uint screen_width=1280;
+constexpr uint screen_height=720;
+
+constexpr char vertex_shader[]=R"(
+#version 330 core
+
+in vec2 Vertex;
+in vec2 TexCoord;
+
+out vec2 FragmentTexCoord;
+
+void main()
+{
+    FragmentTexCoord=TexCoord;
+
+    gl_Position=vec4(Vertex,0.0,1.0);
+})";
+
+constexpr char fragment_shader[]=R"(
+#version 330 core
+
+sampler2D Texture0;
+
+in vec4 FragmentTexCoord;
+out vec4 FragColor;
+
+void main()
+{
+    FragColor=vec4(FragmentColor.rgb,1);
+})";
+
+Shader shader;
+
+bool InitShader()
+{
+    if(!shader.AddVertexShader(vertex_shader))
+        return(false);
+
+    if(!shader.AddFragmentShader(fragment_shader))
+        return(false);
+
+    if(!shader.Build())
+        return(false);
+
+    if(!shader.Use())
+        return(false);
+
+    return(true);
+}
+
+VB2f *vb_vertex=nullptr;
+VB2f *vb_texcoord=nullptr;
+VertexArray *va=nullptr;
+
+constexpr float vertex_data[]={ -0.5f, 0.5f,
+                                -0.5f,-0.5f,
+                                 0.5f, 0.5f,
+                                 0.5f,-0.5f
+};
+
+constexpr float texcoord_data[]={   0,0,
+                                    0,1,
+                                    1,0,
+                                    1,1   };
+
+
+void BindVBO2VAO(const int vao,const int binding_index,const int shader_location,VertexBufferBase *vb)
+{
+    glVertexArrayAttribBinding(vao,shader_location,binding_index);
+    glVertexArrayAttribFormat(vao,shader_location,vb->GetComponent(),vb->GetDataType(),GL_FALSE,0);
+    glEnableVertexArrayAttrib(vao,shader_location);
+    glVertexArrayVertexBuffer(vao,binding_index,vb->GetBufferIndex(),0,vb->GetStride());
+}
+
+void InitVertexBuffer()
+{
+    vb_vertex=new VB2f(4,vertex_data);
+    vb_texcoord=new VB2f(4,texcoord_data);
+
+    va=new VertexArray(GL_TRIANGLES,        //画三角形
+                        2);                  //两个属性
+
+    const int vertex_location=shader.GetAttribLocation("Vertex");              ///<取得顶点数据输入流对应的shader地址
+    const int texcoord_location=shader.GetAttribLocation("TexCoord");             ///<取得纹理坐标数据输入流对应的shader地址
+
+    int binding_index=0;                    //绑定点
+
+    const int vao=va->GetVAO();
+
+    va->SetVertexBuffer(vb_vertex);
+    va->AddVertexAttribBuffer(vb_texcoord);
+
+    BindVBO2VAO(vao,binding_index,vertex_location,vb_vertex);
+    ++binding_index;
+    BindVBO2VAO(vao,binding_index,texcoord_location,vb_texcoord);
+}
+
+constexpr GLfloat clear_color[4]=
+{
+    77.f/255.f,
+    78.f/255.f,
+    83.f/255.f,
+    1.f
+};
+
+constexpr GLfloat clear_depth=1.0f;
+
+void draw()
+{
+    glClearBufferfv(GL_COLOR,0,clear_color);
+    glClearBufferfv(GL_DEPTH,0,&clear_depth);
+
+    va->Draw();
+}
+
+int main(void)
+{
+    RenderDevice *device=CreateRenderDeviceGLFW();
+
+    if(!device)
+    {
+        std::cerr<<"Create RenderDevice(GLFW) failed."<<std::endl;
+        return -1;
+    }
+
+    if(!device->Init())
+    {
+        std::cerr<<"Init RenderDevice(GLFW) failed."<<std::endl;
+        return -2;
+    }
+
+    WindowSetup ws;
+
+    ws.Name=U8_TEXT("Direct use \"OpenGL Core API\" Render");
+
+    RenderSetup rs;
+
+    RenderWindow *win=device->Create(screen_width,screen_height,&ws,&rs);
+
+    win->MakeToCurrent();               //切换当前窗口到前台
+
+    InitOpenGLDebug();                  //初始化OpenGL调试输出
+
+    if(!InitShader())
+    {
+        std::cerr<<"init shader failed."<<std::endl;
+        return -3;
+    }
+
+    InitVertexBuffer();
+
+    win->Show();
+
+    while(win->IsOpen())
+    {
+        draw();
+
+        win->SwapBuffer();              //交换前后台显示缓冲区
+        win->PollEvent();               //处理窗口事件
+    }
+
+    delete win;
+    delete device;
+
+    return 0;
+}