绘制点精灵

main.cpp

@@ -90,7 +90,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	glewInit();
 
 	/*创建program*/
-	GLuint program = CreateGPUProgram("res/shader/UI FullScreemQuad.vs", "res/shader/UI.fs");
+	GLuint program = CreateGPUProgram("res/shader/PointSprite.vs", "res/shader/PointSprite.fs");
 
 	GLuint posLocation, texcoordLocation, normalLocation, MLocation, VLocation, PLocation, NMLocation, textureLocation;
 	posLocation = glGetAttribLocation(program, "pos");
@@ -115,6 +115,9 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		printf("load obj model fail\n");
 	}
 
+	vertexes[0].position[0] = 0.0f;
+	vertexes[0].position[1] = 0.0f;
+
 	/*创建vbo*/
 	GLuint vbo = CreateBufferObject(GL_ARRAY_BUFFER, sizeof(VertexData) * vertexCount, GL_STATIC_DRAW, vertexes);
 
@@ -125,8 +128,10 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	GLuint mainTexture = CreateTextureFromFile("res/image/stone.jpg");
 	GLuint secondTexture = CreateTextureFromDds("res/image/150001.dds");
 
-	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+	glClearColor(0.1f, 0.4f, 0.7f, 1.0f);
 	glEnable(GL_DEPTH_TEST);
+	glEnable(GL_POINT_SPRITE);
+	glEnable(GL_PROGRAM_POINT_SIZE);
 	glViewport(0,0, windowWidth, windowHeight);
 
 	//创建一个单位矩阵和一个投影矩阵，后面用来传递到shader
@@ -170,7 +175,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		glBindBuffer(GL_ARRAY_BUFFER, 0);
 
 		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
-		glDrawElements(GL_TRIANGLES, indexCount, GL_UNSIGNED_INT, 0);
+		glDrawElements(GL_POINTS, 1, GL_UNSIGNED_INT, 0);
 		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 		glUseProgram(0);
 	};
@@ -185,9 +190,6 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		}
 
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-		
-		glEnable(GL_SCISSOR_TEST);
-		glScissor(400,300, 100, 100);
 		what();
 
 		SwapBuffers(dc);

res/shader/PointSprite.fs

@@ -0,0 +1,5 @@
+uniform sampler2D U_MainTexture;
+void main()
+{
+    gl_FragColor=texture2D(U_MainTexture,gl_PointCoord.xy);
+}

res/shader/PointSprite.vs

@@ -0,0 +1,13 @@
+attribute vec3 pos;
+attribute vec2 texcoord;
+attribute vec3 normal;
+
+uniform mat4 M;
+uniform mat4 V;
+uniform mat4 P;
+
+void main()
+{
+	gl_PointSize = 30.0;
+    gl_Position=P*V*M*vec4(pos,1.0);
+}

shader2.vcxproj

@@ -157,11 +157,8 @@
     <ClInclude Include="timer.h" />
   </ItemGroup>
   <ItemGroup>
-    <None Include="res\shader\test.fs" />
-    <None Include="res\shader\test.vs" />
-    <None Include="res\shader\UI FullScreemQuad.vs" />
-    <None Include="res\shader\UI.fs" />
-    <None Include="res\shader\UI.vs" />
+    <None Include="res\shader\PointSprite.fs" />
+    <None Include="res\shader\PointSprite.vs" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

shader2.vcxproj.filters

@@ -40,19 +40,10 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
-    <None Include="res\shader\test.fs">
+    <None Include="res\shader\PointSprite.fs">
       <Filter>源文件</Filter>
     </None>
-    <None Include="res\shader\test.vs">
-      <Filter>源文件</Filter>
-    </None>
-    <None Include="res\shader\UI.fs">
-      <Filter>源文件</Filter>
-    </None>
-    <None Include="res\shader\UI.vs">
-      <Filter>源文件</Filter>
-    </None>
-    <None Include="res\shader\UI FullScreemQuad.vs">
+    <None Include="res\shader\PointSprite.vs">
       <Filter>源文件</Filter>
     </None>
   </ItemGroup>