锁定画布的绘制区域

.gitignore

@@ -39,3 +39,4 @@ x64
 .git
 ipch
 shader2.VC.db
+shader2.VC.VC.opendb

main.cpp

@@ -144,26 +144,16 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	/*¼àÌý²¢´¦ÀíÓû§ÇëÇó*/
 	MSG msg;
 
-	while (true) {
-		if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE)) {
-			if (msg.message == WM_QUIT) {
-				break;
-			}
-			TranslateMessage(&msg);
-			DispatchMessage(&msg);
-		}
-
+	auto what = [&]()->void {
 		glm::mat4 normalMatrix = glm::inverseTranspose(model);
 
-		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-		
 		glUseProgram(program);
 		glUniformMatrix4fv(MLocation, 1, GL_FALSE, glm::value_ptr(model));
 		glUniformMatrix4fv(VLocation, 1, GL_FALSE, identify);
 		glUniformMatrix4fv(PLocation, 1, GL_FALSE, glm::value_ptr(projection));
 		glUniformMatrix4fv(NMLocation, 1, GL_FALSE, glm::value_ptr(normalMatrix));
 
-		glBindTexture(GL_TEXTURE_2D, secondTexture);
+		glBindTexture(GL_TEXTURE_2D, mainTexture);
 		glUniform1i(textureLocation, 0);
 
 		glBindBuffer(GL_ARRAY_BUFFER, vbo);
@@ -179,6 +169,22 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		glDrawElements(GL_TRIANGLES, indexCount, GL_UNSIGNED_INT, 0);
 		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 		glUseProgram(0);
+	};
+
+	while (true) {
+		if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE)) {
+			if (msg.message == WM_QUIT) {
+				break;
+			}
+			TranslateMessage(&msg);
+			DispatchMessage(&msg);
+		}
+
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		
+		glEnable(GL_SCISSOR_TEST);
+		glScissor(400,300, 100, 100);
+		what();
 
 		SwapBuffers(dc);
 	}