Move all OpenGL-specific code to a separate directory

[libs/gl.git] / source / backends / opengl / texture3d_backend.cpp

diff --git a/source/backends/opengl/texture3d_backend.cpp b/source/backends/opengl/texture3d_backend.cpp
new file mode 100644 (file)
index 0000000..6826993
--- /dev/null
+++ b/source/backends/opengl/texture3d_backend.cpp
@@ -0,0 +1,75 @@
+#include <msp/gl/extensions/arb_direct_state_access.h>
+#include <msp/gl/extensions/arb_texture_storage.h>
+#include <msp/gl/extensions/ext_texture3d.h>
+#include <msp/gl/extensions/ext_texture_array.h>
+#include "gl.h"
+#include "texture3d.h"
+#include "texture3d_backend.h"
+
+namespace Msp {
+namespace GL {
+
+OpenGLTexture3D::OpenGLTexture3D():
+       Texture(GL_TEXTURE_3D)
+{
+       static Require _req(EXT_texture3D);
+}
+
+OpenGLTexture3D::OpenGLTexture3D(unsigned t):
+       Texture(t)
+{ }
+
+void OpenGLTexture3D::allocate()
+{
+       unsigned width = static_cast<const Texture3D *>(this)->width;
+       unsigned height = static_cast<const Texture3D *>(this)->height;
+       unsigned depth = static_cast<const Texture3D *>(this)->depth;
+       unsigned levels = static_cast<const Texture3D *>(this)->levels;
+
+       GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
+       if(ARB_texture_storage)
+       {
+               if(ARB_direct_state_access)
+                       glTextureStorage3D(id, levels, gl_fmt, width, height, depth);
+               else
+               {
+                       bind_scratch();
+                       glTexStorage3D(target, levels, gl_fmt, width, height, depth);
+               }
+       }
+       else
+       {
+               bind_scratch();
+               GLenum comp = get_gl_components(get_components(storage_fmt));
+               GLenum type = get_gl_type(get_component_type(storage_fmt));
+               for(unsigned i=0; i<levels; ++i)
+               {
+                       auto lv_size = static_cast<const Texture3D *>(this)->get_level_size(i);
+                       glTexImage3D(target, i, gl_fmt, lv_size.x, lv_size.y, lv_size.z, 0, comp, type, 0);
+               }
+               glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
+       }
+
+       apply_swizzle();
+}
+
+void OpenGLTexture3D::sub_image(unsigned level, int x, int y, int z, unsigned wd, unsigned ht, unsigned dp, const void *data)
+{
+       GLenum comp = get_gl_components(get_components(storage_fmt));
+       GLenum type = get_gl_type(get_component_type(storage_fmt));
+       if(ARB_direct_state_access)
+               glTextureSubImage3D(id, level, x, y, z, wd, ht, dp, comp, type, data);
+       else
+       {
+               bind_scratch();
+               glTexSubImage3D(target, level, x, y, z, wd, ht, dp, comp, type, data);
+       }
+}
+
+bool OpenGLTexture3D::is_array() const
+{
+       return target==GL_TEXTURE_2D_ARRAY;
+}
+
+} // namespace GL
+} // namespace Msp