使用instance绘制多个模型

main.cpp

@@ -91,12 +91,13 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	glewInit();
 
 	/*创建program*/
-	GLuint program = CreateGPUProgram("res/shader/test.vs", "res/shader/test.fs");
+	GLuint program = CreateGPUProgram("res/shader/diffuse.vs", "res/shader/diffuse.fs");
 
-	GLuint posLocation, texcoordLocation, normalLocation, MLocation, VLocation, PLocation, NMLocation, textureLocation;
+	GLuint posLocation, texcoordLocation, normalLocation, MLocation, VLocation, PLocation, NMLocation, textureLocation, offsetLocation;
 	posLocation = glGetAttribLocation(program, "pos");
 	texcoordLocation = glGetAttribLocation(program, "texcoord");
 	normalLocation = glGetAttribLocation(program, "normal");
+	offsetLocation = glGetAttribLocation(program, "offset");
 	MLocation = glGetUniformLocation(program, "M");
 	VLocation = glGetUniformLocation(program, "V");
 	PLocation = glGetUniformLocation(program, "P");
@@ -109,7 +110,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	int vertexCount = 0, indexCount = 0;
 	Timer t;
 	t.Start();
-	VertexData* vertexes = LoadObjModel("res/model/Sphere.obj", &indexes, vertexCount, indexCount);
+	VertexData* vertexes = LoadObjModel("res/model/niutou.obj", &indexes, vertexCount, indexCount);
 	printf("load model cost %fs %d\n", t.GetPassedTime(), t.GetPassedTickers());
 
 	if (vertexes == nullptr) {
@@ -123,7 +124,17 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	GLuint ibo = CreateBufferObject(GL_ELEMENT_ARRAY_BUFFER, sizeof(unsigned int) * indexCount, GL_STATIC_DRAW, indexes);
 
 	/*创建纹理*/
-	GLuint mainTexture = CreateTextureFromFile("res/image/stone.jpg");
+	GLuint mainTexture = CreateTextureFromFile("res/image/niutou.bmp");
+
+	/* 定义了3个点表示3个模型的位置 */
+	float posOffsets[] = {
+		-1.0f, 0.0f, 0.0f,
+		0.0f, 0.0f, 0.0f,
+		1.0f, 0.0f, 0.0f
+	};
+	/*创建offset VBO*/
+	GLuint offsetVBO = CreateBufferObject(GL_ARRAY_BUFFER, sizeof(float)*9, GL_STATIC_DRAW, posOffsets);
+
 
 	glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
 	glEnable(GL_DEPTH_TEST);
@@ -138,7 +149,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		0,0,0,1
 	};
 
-	glm::mat4 model = glm::translate(0.0f, 0.0f, -3.0f);
+	glm::mat4 model = glm::translate(0.0f, -0.5f, -4.0f) * glm::rotate(-90.0f, 0.0f, 1.0f, 0.0f)*glm::scale(0.01f,0.01f,0.01f);
 	glm::mat4 projection = glm::perspective(45.0f, (float)windowWidth / (float)windowHeight, 0.1f, 1000.0f);
 	glm::mat4 normalMatrix = glm::inverseTranspose(model);
 
@@ -171,12 +182,19 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		glVertexAttribPointer(normalLocation, 3, GL_FLOAT, GL_FALSE, sizeof(VertexData), (void*)(sizeof(float) * 5));
 		glBindBuffer(GL_ARRAY_BUFFER, 0);
 
+		glBindBuffer(GL_ARRAY_BUFFER, offsetVBO);
+		glEnableVertexAttribArray(offsetLocation);
+		glVertexAttribPointer(offsetLocation, 3, GL_FLOAT, GL_FALSE, sizeof(float)*3, (void*)0);
+		glBindBuffer(GL_ARRAY_BUFFER, 0);
+		glVertexAttribDivisor(offsetLocation, 1);
+
 		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
-		glDrawElements(GL_TRIANGLES, indexCount, GL_UNSIGNED_INT, 0);
+		glDrawElementsInstanced(GL_TRIANGLES, indexCount, GL_UNSIGNED_INT, 0,3);
 		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 		glUseProgram(0);
 	};
 
+	Timer t2;
 	while (true) {
 		if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE)) {
 			if (msg.message == WM_QUIT) {
@@ -187,8 +205,12 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		}
 
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		t2.Start();
+		//model = glm::translate(-1.0f, -0.5f, -4.0f) * glm::rotate(-90.0f, 0.0f, 1.0f, 0.0f)*glm::scale(0.01f, 0.01f, 0.01f);
 		what();
+		glFlush();
 
+		printf("cost time %f\n",t2.GetPassedTime()*1000.0f);
 		SwapBuffers(dc);
 	}
 

res/shader/diffuse.fs

@@ -0,0 +1,25 @@
+uniform sampler2D U_MainTexture;
+varying vec3 V_Normal;
+varying vec4 V_WorldPos;//µ±Ç°µÄλÖÃ
+varying vec2 V_Texcoord;
+
+void main() {
+
+	vec3 lightPos = vec3(0.0, 10.0, 0.0);
+	vec3 L=lightPos;
+	L = normalize(L);
+	vec3 n = normalize(V_Normal);
+
+
+	//ambient
+	vec4 AmbientLightColor = vec4(0.2, 0.2, 0.2, 1.0);
+	vec4 AmbientMaterial = vec4(0.2, 0.2, 0.2, 1.0);
+	vec4 AmbientColor = AmbientLightColor*AmbientMaterial;
+
+	//diffuse
+	vec4 DiffuseLightColor = vec4(1.0,1.0,1.0,1.0);
+	vec4 DiffuseMaterial = vec4(0.8, 0.8, 0.8, 1.0);
+	vec4 diffuseColor = DiffuseLightColor*DiffuseMaterial*max(0.0, dot(L,n));
+
+	gl_FragColor = AmbientColor + texture2D(U_MainTexture, V_Texcoord) * diffuseColor;
+}

res/shader/diffuse.vs

@@ -0,0 +1,20 @@
+attribute vec3 pos;
+attribute vec2 texcoord;
+attribute vec3 normal;
+attribute vec3 offset;
+
+uniform mat4 M;
+uniform mat4 V;
+uniform mat4 P;
+uniform mat4 NM;
+
+varying vec3 V_Normal;
+varying vec4 V_WorldPos;//µ±Ç°µÄλÖÃ
+varying vec2 V_Texcoord;
+
+void main() {
+	V_Normal = mat3(NM)*normal;
+	V_WorldPos = M * vec4(pos, 1.0) + vec4(offset, 1.0f);
+	V_Texcoord = texcoord;
+	gl_Position = P*V*V_WorldPos;	
+}

shader2.vcxproj

@@ -159,8 +159,8 @@
     <ClInclude Include="timer.h" />
   </ItemGroup>
   <ItemGroup>
-    <None Include="res\shader\test.fs" />
-    <None Include="res\shader\test.vs" />
+    <None Include="res\shader\diffuse.fs" />
+    <None Include="res\shader\diffuse.vs" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

shader2.vcxproj.filters

@@ -46,10 +46,10 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
-    <None Include="res\shader\test.fs">
+    <None Include="res\shader\diffuse.fs">
       <Filter>源文件</Filter>
     </None>
-    <None Include="res\shader\test.vs">
+    <None Include="res\shader\diffuse.vs">
       <Filter>源文件</Filter>
     </None>
   </ItemGroup>