多重采样抗锯齿

main.cpp

@@ -1,5 +1,6 @@
 #include <windows.h>
 #include "glew.h"
+#include "wglew.h"
 #include "Glm/glm.hpp"
 #include "Glm/ext.hpp"
 #include <stdio.h>
@@ -10,6 +11,44 @@
 #pragma comment(lib,"opengl32.lib")
 #pragma comment(lib, "glew32.lib")
 
+HGLRC CreateNBRC(HDC dc)
+{
+	HGLRC rc;
+	GLint attribs[]{
+		WGL_DRAW_TO_WINDOW_ARB,GL_TRUE,
+		WGL_ACCELERATION_ARB,WGL_FULL_ACCELERATION_ARB,
+		WGL_DOUBLE_BUFFER_ARB,GL_TRUE,
+		WGL_RED_BITS_ARB,8,
+		WGL_GREEN_BITS_ARB,8,
+		WGL_BLUE_BITS_ARB,8,
+		WGL_ALPHA_BITS_ARB,8,
+		WGL_DEPTH_BITS_ARB,24,
+		WGL_STENCIL_BITS_ARB,8,
+		WGL_SAMPLE_BUFFERS_ARB,GL_TRUE,
+		WGL_SAMPLES_ARB,16,
+		NULL,NULL
+	};
+	int pixelFormat[256] = { 0 };
+	UINT formatNum = 0;
+	wglChoosePixelFormatARB(dc, attribs, NULL, 256, pixelFormat, &formatNum);
+	printf("support format number is %u\n", formatNum);
+	if (formatNum>0)
+	{
+		PIXELFORMATDESCRIPTOR pfd;
+		DescribePixelFormat(dc, pixelFormat[0], sizeof(pfd), &pfd);
+		SetPixelFormat(dc, pixelFormat[0], &pfd);
+
+		int contexAttributes[] = {
+			WGL_CONTEXT_MAJOR_VERSION_ARB,4,
+			WGL_CONTEXT_MINOR_VERSION_ARB,3,
+			WGL_CONTEXT_PROFILE_MASK_ARB,WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
+			0
+		};
+		rc = wglCreateContextAttribsARB(dc, nullptr, contexAttributes);
+	}
+	return rc;
+}
+
 /**
 * @hwnd 发起消息的窗口
 * @msg 消息类型
@@ -90,6 +129,22 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	/*glew初始化*/
 	glewInit();
 
+	if (wglChoosePixelFormatARB)
+	{
+		//destroy window
+		wglMakeCurrent(dc, nullptr);
+		wglDeleteContext(rc);
+		rc = nullptr;
+		ReleaseDC(hwnd, dc);
+		dc = nullptr;
+		DestroyWindow(hwnd);
+		hwnd = CreateWindowEx(NULL, L"GLWindow", L"OpenGL Window", WS_OVERLAPPEDWINDOW, 100, 100, windowWidth, windowHeight, NULL, NULL, hinstance, NULL);
+		//create msaa rc
+		dc = GetDC(hwnd);
+		rc = CreateNBRC(dc);
+		wglMakeCurrent(dc, rc);
+	}
+
 	/*创建program*/
 	GLuint program = CreateGPUProgram("res/shader/SimpleTexture.vs", "res/shader/SimpleTexture.fs");
 
@@ -224,7 +279,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		glUseProgram(fsqprogram);
 
 		glBindVertexArray(fsqvao);
-		glBindTexture(GL_TEXTURE_2D, depthBuffer);
+		glBindTexture(GL_TEXTURE_2D, colorBuffer);
 		glUniform1i(fsqtextureLocation, 0);
 		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, fsqibo);
 		glDrawElements(GL_TRIANGLES, fsqindexCount, GL_UNSIGNED_INT, 0);
@@ -247,13 +302,8 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 			DispatchMessage(&msg);
 		}
 
-		glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 		what();
-		glBindFramebuffer(GL_FRAMEBUFFER, 0);
-		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
-		RenderFullScreenQuad();
 
 		glFlush();
 		SwapBuffers(dc);

res/shader/RenderDepthBuffer.fs

@@ -4,6 +4,8 @@ varying vec2 V_Texcoord;
 
 void main()
 {
-	float depthValue=pow(texture2D(U_MainTexture,V_Texcoord).r,8.0);
-    gl_FragColor=vec4(vec3(depthValue),1.0);
+	//float depthValue=pow(texture2D(U_MainTexture,V_Texcoord).r,8.0);
+    //gl_FragColor=vec4(vec3(depthValue),1.0);
+
+	gl_FragColor=texture2D(U_MainTexture,V_Texcoord);
 }