diff options
Diffstat (limited to 'Source/modules/asura-core/Graphics/Canvas.cpp')
| -rw-r--r-- | Source/modules/asura-core/Graphics/Canvas.cpp | 49 |
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: 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); +} + +namespace_end + +namespace_end
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