X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fpixelformat.cpp;h=0b13f3ccefa7fe53cf2e5868b157a7d0c0e5588b;hp=d968917b25956440bf0f8f096baffec4dcba7737;hb=abb4e50bdbb6d62d7e6ee249d52353ccf22762a4;hpb=a5797c9babd17673285b3b15c7572c2d8fe1595c

diff --git a/source/pixelformat.cpp b/source/pixelformat.cpp
index d968917b..0b13f3cc 100644
--- a/source/pixelformat.cpp
+++ b/source/pixelformat.cpp
@@ -1,11 +1,6 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#include "except.h"
+#include <msp/gl/extensions/arb_texture_float.h>
+#include <msp/gl/extensions/ext_bgra.h>
+#include <msp/strings/format.h>
 #include "pixelformat.h"
 
 using namespace std;
@@ -13,55 +8,329 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
-istream &operator>>(istream &in, PixelFormat &fmt)
+void operator>>(const LexicalConverter &conv, PixelFormat &fmt)
 {
-	string word;
-
-	in>>word;
-	if(word=="COLOR_INDEX")
-		fmt=COLOR_INDEX;
-	else if(word=="STENCIL_INDEX")
-		fmt=STENCIL_INDEX;
-	else if(word=="DEPTH_COMPONENT")
-		fmt=DEPTH_COMPONENT;
-	else if(word=="RED")
-		fmt=RED;
-	else if(word=="GREEN")
-		fmt=GREEN;
-	else if(word=="BLUE")
-		fmt=BLUE;
-	else if(word=="ALPHA")
-		fmt=ALPHA;
-	else if(word=="RGB")
-		fmt=RGB;
-	else if(word=="RGBA")
-		fmt=RGBA;
-	else if(word=="BGR")
-		fmt=BGR;
-	else if(word=="BGRA")
-		fmt=BGRA;
-	else if(word=="LUMINANCE")
-		fmt=LUMINANCE;
-	else if(word=="LUMINANCE_ALPHA")
-		fmt=LUMINANCE_ALPHA;
+	if(conv.get()=="STENCIL_INDEX")
+		fmt = STENCIL_INDEX;
+	else if(conv.get()=="DEPTH_COMPONENT")
+		fmt = DEPTH_COMPONENT;
+	else if(conv.get()=="RED")
+		fmt = RED;
+	else if(conv.get()=="RG")
+		fmt = RG;
+	else if(conv.get()=="RGB")
+		fmt = RGB;
+	else if(conv.get()=="RGBA")
+		fmt = RGBA;
+	else if(conv.get()=="BGR")
+		fmt = BGR;
+	else if(conv.get()=="BGRA")
+		fmt = BGRA;
+	else if(conv.get()=="SRGB")
+		fmt = SRGB;
+	else if(conv.get()=="SRGB_ALPHA")
+		fmt = SRGB_ALPHA;
+	else if(conv.get()=="LUMINANCE")
+		fmt = LUMINANCE;
+	else if(conv.get()=="LUMINANCE_ALPHA")
+		fmt = LUMINANCE_ALPHA;
+	else if(conv.get()=="SLUMINANCE")
+		fmt = SLUMINANCE;
+	else if(conv.get()=="SLUMINANCE_ALPHA")
+		fmt = SLUMINANCE_ALPHA;
 	else
-		in.setstate(ios_base::failbit);
-
-	return in;
+		throw lexical_error(format("conversion of '%s' to PixelFormat", conv.get()));
 }
 
 PixelFormat pixelformat_from_graphics(Graphics::PixelFormat pf)
 {
 	switch(pf)
 	{
-	case Graphics::COLOR_INDEX: return COLOR_INDEX;
 	case Graphics::LUMINANCE: return LUMINANCE;
 	case Graphics::LUMINANCE_ALPHA: return LUMINANCE_ALPHA;
 	case Graphics::RGB: return RGB;
+	case Graphics::RGBX:
 	case Graphics::RGBA: return RGBA;
 	case Graphics::BGR: return BGR;
+	case Graphics::BGRX:
 	case Graphics::BGRA: return BGRA;
-	default: throw InvalidParameterValue("Unknown Graphics::PixelFormat");
+	default: throw invalid_argument("pixelformat_from_graphics");
+	}
+}
+
+PixelFormat storage_pixelformat_from_graphics(Graphics::PixelFormat pf, bool srgb)
+{
+	PixelFormat result;
+	switch(pf)
+	{
+	case Graphics::RGBX:
+	case Graphics::BGR:
+	case Graphics::BGRX: result = RGB; break;
+	case Graphics::BGRA: result = RGBA; break;
+	default: result = pixelformat_from_graphics(pf);
+	}
+
+	if(srgb)
+		return get_srgb_pixelformat(result);
+	else
+		return result;
+}
+
+PixelFormat get_base_pixelformat(PixelFormat pf)
+{
+	PixelFormat unsized = get_unsized_pixelformat(pf);
+	switch(unsized)
+	{
+	case SRGB: return RGB;
+	case SRGB_ALPHA: return RGBA;
+	case SLUMINANCE: return LUMINANCE;
+	case SLUMINANCE_ALPHA: return LUMINANCE_ALPHA;
+	default: return unsized;
+	}
+}
+
+PixelFormat get_unsized_pixelformat(PixelFormat pf)
+{
+	switch(pf)
+	{
+	case R8:
+	case R16F:
+	case R32F: return RED;
+	case RG8:
+	case RG16F:
+	case RG32F: return RG;
+	case RGB8:
+	case RGB16F:
+	case RGB32F: return RGB;
+	case SRGB8: return SRGB;
+	case RGBA8:
+	case RGBA16F:
+	case RGBA32F: return RGBA;
+	case SRGB8_ALPHA8: return SRGB_ALPHA;
+	case LUMINANCE8: return LUMINANCE;
+	case SLUMINANCE8: return SLUMINANCE;
+	case LUMINANCE_ALPHA8: return LUMINANCE_ALPHA;
+	case SLUMINANCE8_ALPHA8: return SLUMINANCE_ALPHA;
+	case DEPTH_COMPONENT16:
+	case DEPTH_COMPONENT24:
+	case DEPTH_COMPONENT32:
+	case DEPTH_COMPONENT32F: return DEPTH_COMPONENT;
+	default: return pf;
+	}
+}
+
+PixelFormat get_sized_pixelformat(PixelFormat pf, unsigned size)
+{
+	if(!size || size>4)
+		throw invalid_argument("get_sized_pixelformat");
+
+	pf = get_unsized_pixelformat(pf);
+
+	switch(size)
+	{
+	case 1:
+		switch(pf)
+		{
+		case RED: return R8;
+		case RG: return RG8;
+		case RGB: return RGB8;
+		case RGBA: return RGBA8;
+		case SRGB: return SRGB8;
+		case SRGB_ALPHA: return SRGB8_ALPHA8;
+		case LUMINANCE: return LUMINANCE8;
+		case SLUMINANCE: return SLUMINANCE8;
+		case LUMINANCE_ALPHA: return LUMINANCE8_ALPHA8;
+		case SLUMINANCE_ALPHA: return SLUMINANCE8_ALPHA8;
+		default: throw invalid_argument("get_sized_pixelformat");
+		}
+	case 2:
+		switch(pf)
+		{
+		case RED: return R16F;
+		case RG: return RG16F;
+		case RGB: return RGB16F;
+		case RGBA: return RGBA16F;
+		case DEPTH_COMPONENT: return DEPTH_COMPONENT16;
+		default: throw invalid_argument("get_sized_pixelformat");
+		}
+	case 3:
+		if(pf==DEPTH_COMPONENT)
+			return DEPTH_COMPONENT24;
+		else
+			throw invalid_argument("get_sized_pixelformat");
+	case 4:
+		switch(pf)
+		{
+		case RED: return R32F;
+		case RG: return RG32F;
+		case RGB: return RGB32F;
+		case RGBA: return RGBA32F;
+		case DEPTH_COMPONENT: return ARB_depth_buffer_float ? DEPTH_COMPONENT32F : DEPTH_COMPONENT32;
+		default: throw invalid_argument("get_sized_pixelformat");
+		}
+	default:
+		throw invalid_argument("get_sized_pixelformat");
+	}
+}
+
+PixelFormat get_default_sized_pixelformat(PixelFormat pf)
+{
+	pf = get_unsized_pixelformat(pf);
+	unsigned size = 1;
+	if(pf==DEPTH_COMPONENT)
+	{
+		if(get_gl_api()==OPENGL_ES2 && !ARB_depth_buffer_float)
+			size = 2;
+		else
+			size = 4;
+	}
+	return get_sized_pixelformat(pf, size);
+}
+
+PixelFormat get_srgb_pixelformat(PixelFormat pf)
+{
+	switch(pf)
+	{
+	case RGB: return SRGB;
+	case RGBA: return SRGB_ALPHA;
+	case RGB8: return SRGB8;
+	case RGBA8: return SRGB8_ALPHA8;
+	case LUMINANCE: return SLUMINANCE;
+	case LUMINANCE8: return SLUMINANCE8;
+	case LUMINANCE_ALPHA: return SLUMINANCE_ALPHA;
+	case LUMINANCE_ALPHA8: return SLUMINANCE8_ALPHA8;
+	default: return pf;
+	}
+}
+
+unsigned get_component_count(PixelFormat pf)
+{
+	switch(get_base_pixelformat(pf))
+	{
+	case STENCIL_INDEX:
+	case DEPTH_COMPONENT:
+	case RED:
+	case LUMINANCE:
+	case SLUMINANCE:
+		return 1;
+	case RG:
+	case LUMINANCE_ALPHA:
+	case SLUMINANCE_ALPHA:
+		return 2;
+	case RGB:
+	case BGR:
+		return 3;
+	case RGBA:
+	case BGRA:
+		return 4;
+	default:
+		throw invalid_argument("get_component_count");
+	}
+}
+
+unsigned get_component_size(PixelFormat pf)
+{
+	switch(pf)
+	{
+	case R8:
+	case RG8:
+	case RGB8:
+	case RGBA8:
+	case SRGB8:
+	case SRGB8_ALPHA8:
+	case LUMINANCE8:
+	case LUMINANCE8_ALPHA8:
+	case SLUMINANCE8:
+	case SLUMINANCE8_ALPHA8:
+		return 1;
+	case R16F:
+	case RG16F:
+	case RGB16F:
+	case RGBA16F:
+	case DEPTH_COMPONENT16:
+		return 2;
+	case DEPTH_COMPONENT24:
+		return 3;
+	case R32F:
+	case RG32F:
+	case RGB32F:
+	case RGBA32F:
+	case DEPTH_COMPONENT32:
+	case DEPTH_COMPONENT32F:
+		return 4;
+	default:
+		return 0;
+	}
+}
+
+unsigned get_pixel_size(PixelFormat pf)
+{
+	return get_component_count(pf)*max(get_component_size(pf), 1U);
+}
+
+void require_pixelformat(PixelFormat pf)
+{
+	/* TODO These checks are only accurate for textures.  On OpenGL ES some
+	formats are allowed for render buffers earlier than textures.  In particular
+	it's possible to create a 16-bit depth renderbuffer on OpenGL ES 2.0 but
+	depth textures are only available with 3.0 or the OES_depth_texture
+	extension.*/
+	switch(pf)
+	{
+	case RGB8:
+	case RGBA8:
+		{ static Require _req(OES_required_internalformat); }
+		break;
+	case RED:
+	case R8:
+	case RG:
+	case RG8:
+		{ static Require _req(ARB_texture_rg); }
+		break;
+	case R16F:
+	case R32F:
+	case RG16F:
+	case RG32F:
+		{ static Require _req(ARB_texture_rg); }
+		{ static Require _req(ARB_texture_float); }
+		break;
+	case RGB16F:
+	case RGB32F:
+	case RGBA16F:
+	case RGBA32F:
+		{ static Require _req(ARB_texture_float); }
+		break;
+	case SRGB:
+	case SRGB8:
+	case SRGB_ALPHA:
+	case SRGB8_ALPHA8:
+	case SLUMINANCE:
+	case SLUMINANCE8:
+	case SLUMINANCE_ALPHA:
+	case SLUMINANCE8_ALPHA8:
+		{ static Require _req(EXT_texture_sRGB); }
+		break;
+	case BGR:
+	case BGRA:
+		{ static Require _req(EXT_bgra); }
+		break;
+	case DEPTH_COMPONENT:
+		{ static Require _req(ARB_depth_texture); }
+		break;
+	case DEPTH_COMPONENT16:
+	case DEPTH_COMPONENT24:
+	case DEPTH_COMPONENT32:
+		{ static Require _req(ARB_depth_texture); }
+		{ static Require _req(OES_required_internalformat); }
+		break;
+	case DEPTH_COMPONENT32F:
+		{ static Require _req(ARB_depth_buffer_float); }
+		break;
+	case STENCIL_INDEX:
+		{ static Require _req(OES_texture_stencil8); }
+		break;
+	default:
+		break;
 	}
 }