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#include "Canvas.h"
namespace AsuraEngine
{
namespace Graphics
{
Canvas::Canvas()
: m_Width(0)
, m_Height(0)
, m_FBO(0)
{
// Fix: ôСʼʱframebufferԴ
//glGenFramebuffers(1, &m_FBO);
//GLint current_fbo;
//glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, ¤t_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, ¤t_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, ¤t_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);
}
}
}
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