X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbackends%2Fopengl%2Ftexturecube_backend.cpp;fp=source%2Fbackends%2Fopengl%2Ftexturecube_backend.cpp;h=b113f1bd21ba1a13f01effd610d67df8e7e01624;hb=160e9eea29bd10034733d59507fa1bcca36be401;hp=0000000000000000000000000000000000000000;hpb=93448d16e72e38afbaecbccf6fdedd46d6a82a73;p=libs%2Fgl.git

diff --git a/source/backends/opengl/texturecube_backend.cpp b/source/backends/opengl/texturecube_backend.cpp
new file mode 100644
index 00000000..b113f1bd
--- /dev/null
+++ b/source/backends/opengl/texturecube_backend.cpp
@@ -0,0 +1,90 @@
+#include <msp/gl/extensions/arb_direct_state_access.h>
+#include <msp/gl/extensions/arb_seamless_cube_map.h>
+#include <msp/gl/extensions/arb_texture_cube_map.h>
+#include <msp/gl/extensions/arb_texture_storage.h>
+#include "gl.h"
+#include "texturecube.h"
+#include "texturecube_backend.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+OpenGLTextureCube::OpenGLTextureCube():
+	Texture(GL_TEXTURE_CUBE_MAP)
+{
+	static Require _req(ARB_texture_cube_map);
+	if(ARB_seamless_cube_map)
+	{
+		static bool seamless_init = false;
+		if(!seamless_init)
+		{
+			glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
+			seamless_init = true;
+		}
+	}
+}
+
+void OpenGLTextureCube::allocate()
+{
+	unsigned size = static_cast<const TextureCube *>(this)->size;
+	unsigned levels = static_cast<const TextureCube *>(this)->levels;
+
+	GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
+	if(ARB_texture_storage)
+	{
+		if(ARB_direct_state_access)
+			glTextureStorage2D(id, levels, gl_fmt, size, size);
+		else
+		{
+			bind_scratch();
+			glTexStorage2D(target, levels, gl_fmt, size, size);
+		}
+	}
+	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)
+		{
+			unsigned lv_size = static_cast<const TextureCube *>(this)->get_level_size(i);
+			for(unsigned j=0; j<6; ++j)
+				glTexImage2D(get_gl_cube_face(j), i, gl_fmt, lv_size, lv_size, 0, comp, type, 0);
+		}
+		glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
+	}
+
+	apply_swizzle();
+}
+
+void OpenGLTextureCube::sub_image(unsigned face, unsigned level, int x, int y, unsigned wd, unsigned ht, 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, face, wd, ht, 1, comp, type, data);
+	else
+	{
+		bind_scratch();
+		glTexSubImage2D(get_gl_cube_face(face), level, x, y, wd, ht, comp, type, data);
+	}
+}
+
+unsigned get_gl_cube_face(unsigned face)
+{
+	switch(static_cast<TextureCubeFace>(face))
+	{
+	case POSITIVE_X: return GL_TEXTURE_CUBE_MAP_POSITIVE_X;
+	case NEGATIVE_X: return GL_TEXTURE_CUBE_MAP_NEGATIVE_X;
+	case POSITIVE_Y: return GL_TEXTURE_CUBE_MAP_POSITIVE_Y;
+	case NEGATIVE_Y: return GL_TEXTURE_CUBE_MAP_NEGATIVE_Y;
+	case POSITIVE_Z: return GL_TEXTURE_CUBE_MAP_POSITIVE_Z;
+	case NEGATIVE_Z: return GL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
+	default: throw invalid_argument("get_gl_cube_face");
+	}
+}
+
+} // namespace GL
+} // namespace Msp