*修改文件名格式

1 files changed, 49 insertions, 0 deletions

diff --git a/source/modules/asura-core/Graphics/Canvas.cpp b/source/modules/asura-core/Graphics/Canvas.cpp
new file mode 100644
index 0000000..60c8f87
--- /dev/null
+++ b/source/modules/asura-core/Graphics/Canvas.cpp
@@ -0,0 +1,49 @@
+#include "Canvas.h"
+
+namespace_begin(AsuraEngine)
+namespace_begin(Graphics)
+
+Canvas::Canvas()
+	: m_Width(0)
+	, m_Height(0)
+	, m_FBO(0)
+{
+	// Fix: �����ô�С��ʼ��ʱ������framebuffer��Դ��
+	//glGenFramebuffers(1, &m_FBO);
+	//GLint current_fbo;
+	//glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &current_fbo);
+	//glBindFramebuffer(GL_FRAMEBUFFER, m_FBO);
+	//glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_TexID, 0);
+	//glBindFramebuffer(GL_FRAMEBUFFER, current_fbo);
+}
+
+void Canvas::SetSize(uint w, uint h)
+{
+	if (m_FBO == 0)
+	{
+		glGenFramebuffers(1, &m_FBO);
+		if (m_FBO == 0)
+			throw Exception("OpenGL glGenFramebuffers cannot generate frame buffer object.");
+		// ��������
+		if (m_TexID == 0)
+		{
+			glGenTextures(1, &m_TexID);
+			if (m_TexID == 0)
+				throw Exception("OpenGL glGenTextures cannot generate texture.");
+		}
+		GLint current_fbo;
+		glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &current_fbo);
+		glBindFramebuffer(GL_FRAMEBUFFER, m_FBO);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_TexID, 0);
+		glBindFramebuffer(GL_FRAMEBUFFER, current_fbo);
+	}
+	GLint current_tex; 
+	glGetIntegerv(GL_TEXTURE_BINDING_2D, &current_tex);
+	glBindTexture(GL_TEXTURE_2D, m_TexID);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	glBindTexture(GL_TEXTURE_2D, current_tex);
+}
+
+namespace_end
+
+namespace_end
\ No newline at end of file