使用IBO绘制

main.cpp

@@ -1,4 +1,3 @@
-#define _CRT_SECURE_NO_WARNINGS
 #include <windows.h>
 #include "glew.h"
 #include "Glm/glm.hpp"
@@ -217,6 +216,14 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	glBufferData(GL_ARRAY_BUFFER, sizeof(float)*7*3, vertex, GL_STATIC_DRAW);
 	glBindBuffer(GL_ARRAY_BUFFER, 0);
 
+	/*创建IBO*/
+	unsigned int indexes[] = {0,1,2};
+	GLuint ibo;
+	glGenBuffers(1, &ibo);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(unsigned int) * 3, indexes, GL_STATIC_DRAW);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
 	glClearColor(1.0f, 1.0f, 0.0f, 1.0f);
 
 	//创建一个单位矩阵和一个投影矩阵，后面用来传递到shader
@@ -259,7 +266,10 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		glVertexAttribPointer(colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(sizeof(float) * 3));
 		glBindBuffer(GL_ARRAY_BUFFER, 0);
 
-		glDrawArrays(GL_TRIANGLES, 0, 3);
+		//glDrawArrays(GL_TRIANGLES, 0, 3);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
+		glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_INT, 0);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 
 		glUseProgram(0);
 		SwapBuffers(dc);

shader2.vcxproj

@@ -88,6 +88,7 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalOptions>/D_CRT_SECURE_NO_WARNINGS %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>