X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fpixelformat.cpp;h=0b13f3ccefa7fe53cf2e5868b157a7d0c0e5588b;hp=7647717a44ad3d047e7bfbc0d386a575f5564701;hb=20af6dd2f04caa224d8cae00befc97d010a1ed08;hpb=4d7f66ea28c788e12f700216b9c53af9e71b8390

diff --git a/source/pixelformat.cpp b/source/pixelformat.cpp
index 7647717a..0b13f3cc 100644
--- a/source/pixelformat.cpp
+++ b/source/pixelformat.cpp
@@ -10,20 +10,14 @@ namespace GL {
 
 void operator>>(const LexicalConverter &conv, PixelFormat &fmt)
 {
-	if(conv.get()=="COLOR_INDEX")
-		fmt = COLOR_INDEX;
-	else if(conv.get()=="STENCIL_INDEX")
+	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()=="GREEN")
-		fmt = GREEN;
-	else if(conv.get()=="BLUE")
-		fmt = BLUE;
-	else if(conv.get()=="ALPHA")
-		fmt = ALPHA;
+	else if(conv.get()=="RG")
+		fmt = RG;
 	else if(conv.get()=="RGB")
 		fmt = RGB;
 	else if(conv.get()=="RGBA")
@@ -52,7 +46,6 @@ 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;
@@ -65,46 +58,135 @@ PixelFormat pixelformat_from_graphics(Graphics::PixelFormat pf)
 	}
 }
 
-PixelFormat storage_pixelformat_from_graphics(Graphics::PixelFormat pf)
+PixelFormat storage_pixelformat_from_graphics(Graphics::PixelFormat pf, bool srgb)
 {
+	PixelFormat result;
 	switch(pf)
 	{
 	case Graphics::RGBX:
 	case Graphics::BGR:
-	case Graphics::BGRX: return RGB;
-	case Graphics::BGRA: return RGBA;
-	default: return pixelformat_from_graphics(pf);
+	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:
-	case SRGB:
-	case SRGB8: return RGB;
+	case RGB32F: return RGB;
+	case SRGB8: return SRGB;
 	case RGBA8:
 	case RGBA16F:
-	case RGBA32F:
-	case SRGB_ALPHA:
-	case SRGB8_ALPHA8: return RGBA;
-	case LUMINANCE8:
-	case LUMINANCE16F:
-	case LUMINANCE32F:
-	case SLUMINANCE:
-	case SLUMINANCE8: return LUMINANCE;
-	case LUMINANCE_ALPHA8:
-	case LUMINANCE_ALPHA16F:
-	case LUMINANCE_ALPHA32F:
-	case SLUMINANCE_ALPHA:
-	case SLUMINANCE8_ALPHA8: return LUMINANCE_ALPHA;
+	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)
@@ -125,15 +207,13 @@ unsigned get_component_count(PixelFormat pf)
 {
 	switch(get_base_pixelformat(pf))
 	{
-	case COLOR_INDEX:
 	case STENCIL_INDEX:
 	case DEPTH_COMPONENT:
 	case RED:
-	case GREEN:
-	case BLUE:
 	case LUMINANCE:
 	case SLUMINANCE:
 		return 1;
+	case RG:
 	case LUMINANCE_ALPHA:
 	case SLUMINANCE_ALPHA:
 		return 2;
@@ -144,7 +224,7 @@ unsigned get_component_count(PixelFormat pf)
 	case BGRA:
 		return 4;
 	default:
-		throw invalid_argument("get_pixelformat_component_count");
+		throw invalid_argument("get_component_count");
 	}
 }
 
@@ -152,38 +232,72 @@ 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 LUMINANCE16F:
-	case LUMINANCE_ALPHA16F:
+	case DEPTH_COMPONENT16:
 		return 2;
+	case DEPTH_COMPONENT24:
+		return 3;
+	case R32F:
+	case RG32F:
 	case RGB32F:
 	case RGBA32F:
-	case LUMINANCE32F:
-	case LUMINANCE_ALPHA32F:
+	case DEPTH_COMPONENT32:
+	case DEPTH_COMPONENT32F:
 		return 4;
 	default:
-		return 1;
+		return 0;
 	}
 }
 
 unsigned get_pixel_size(PixelFormat pf)
 {
-	return get_component_count(pf)*get_component_size(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:
-	case LUMINANCE16F:
-	case LUMINANCE32F:
-	case LUMINANCE_ALPHA16F:
-	case LUMINANCE_ALPHA32F:
 		{ static Require _req(ARB_texture_float); }
 		break;
 	case SRGB:
@@ -200,6 +314,21 @@ void require_pixelformat(PixelFormat pf)
 	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;
 	}