From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 28 Dec 2013 15:10:36 +0000 (+0200)
Subject: Add basic support for 1D textures
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=744dced516f11d072dc6176fdf2df7e464b9782e

Add basic support for 1D textures
---

diff --git a/source/texture1d.cpp b/source/texture1d.cpp
new file mode 100644
index 00000000..bcebca49
--- /dev/null
+++ b/source/texture1d.cpp
@@ -0,0 +1,60 @@
+#include "bindable.h"
+#include "error.h"
+#include "texture1d.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+Texture1D::Texture1D():
+	Texture(GL_TEXTURE_1D),
+	width(0),
+	allocated(0)
+{ }
+
+void Texture1D::storage(PixelFormat fmt, unsigned wd)
+{
+	if(width>0)
+		throw invalid_operation("Texture1D::storage");
+	if(wd==0)
+		throw invalid_argument("Texture1D::storage");
+	require_pixelformat(fmt);
+
+	ifmt = fmt;
+	width = wd;
+}
+
+void Texture1D::allocate(unsigned level)
+{
+	if(allocated&(1<<level))
+		return;
+
+	image(level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
+}
+
+void Texture1D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
+{
+	if(width==0)
+		throw invalid_operation("Texture1D::image");
+
+	unsigned w = get_level_size(level);
+
+	BindRestore _bind(this);
+	glTexImage1D(target, level, ifmt, w, 0, fmt, type, data);
+
+	allocated |= 1<<level;
+	if(gen_mipmap && level==0)
+	{
+		for(; w; w>>=1, ++level) ;
+		allocated |= (1<<level)-1;
+	}
+}
+
+unsigned Texture1D::get_level_size(unsigned level)
+{
+	return width>>level;
+}
+
+} // namespace GL
+} // namespace Msp
diff --git a/source/texture1d.h b/source/texture1d.h
new file mode 100644
index 00000000..9957eeb4
--- /dev/null
+++ b/source/texture1d.h
@@ -0,0 +1,33 @@
+#ifndef MSP_GL_TEXTURE1D_H_
+#define MSP_GL_TEXTURE1D_H_
+
+#include "datatype.h"
+#include "pixelformat.h"
+#include "texture.h"
+
+namespace Msp {
+namespace GL {
+
+class Texture1D: public Texture
+{
+private:
+	PixelFormat ifmt;
+	unsigned width;
+	unsigned allocated;
+
+public:
+	Texture1D();
+
+	void storage(PixelFormat, unsigned);
+	void allocate(unsigned);
+	void image(unsigned, PixelFormat, DataType, const void *);
+	unsigned get_width() const { return width; }
+
+private:
+	unsigned get_level_size(unsigned);
+};
+
+} // namespace GL
+} // namespace Msp
+
+#endif