1 files changed, 27 insertions, 7 deletions

diff --git a/source/modules/asura-core/graphics/canvas.cpp b/source/modules/asura-core/graphics/canvas.cpp
index 89be45c..0543461 100644
--- a/source/modules/asura-core/graphics/canvas.cpp
+++ b/source/modules/asura-core/graphics/canvas.cpp
@@ -8,21 +8,41 @@ namespace AsuraEngine
 		Canvas::Canvas()
 			: mWidth(0)
 			, mHeight(0)
+			, mFBO(0)
 		{
-			glGenFramebuffers(1, &mFBO);
-			GLint current_fbo;
-			glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &current_fbo);
-			glBindFramebuffer(GL_FRAMEBUFFER, mFBO);
-			glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mTex, 0);
-			glBindFramebuffer(GL_FRAMEBUFFER, current_fbo);
+			// Fix: �����ô�С��ʼ��ʱ������framebuffer��Դ��
+			//glGenFramebuffers(1, &mFBO);
+			//GLint current_fbo;
+			//glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &current_fbo);
+			//glBindFramebuffer(GL_FRAMEBUFFER, mFBO);
+			//glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mTex, 0);
+			//glBindFramebuffer(GL_FRAMEBUFFER, current_fbo);
 		}
 
 		void Canvas::SetSize(uint w, uint h)
 		{
+			if (mFBO == 0)
+			{
+				glGenFramebuffers(1, &mFBO);
+				if (mFBO == 0)
+					throw Exception("OpenGL glGenFramebuffers cannot generate frame buffer object.");
+				// ��������
+				if (mTex == 0)
+				{
+					glGenTextures(1, &mTex);
+					if (mTex == 0)
+						throw Exception("OpenGL glGenTextures cannot generate texture.");
+				}
+				GLint current_fbo;
+				glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &current_fbo);
+				glBindFramebuffer(GL_FRAMEBUFFER, mFBO);
+				glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mTex, 0);
+				glBindFramebuffer(GL_FRAMEBUFFER, current_fbo);
+			}
 			GLint current_tex; 
 			glGetIntegerv(GL_TEXTURE_BINDING_2D, &current_tex);
 			glBindTexture(GL_TEXTURE_2D, mTex);
-
+			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 			glBindTexture(GL_TEXTURE_2D, current_tex);
 		}