X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fpixelformat.cpp;h=0b13f3ccefa7fe53cf2e5868b157a7d0c0e5588b;hp=320fef1f84dd16e447b106df64f1069275c55b89;hb=abb4e50bdbb6d62d7e6ee249d52353ccf22762a4;hpb=21eaad595acb574d81bad5140d24b570da4f9785

diff --git a/source/pixelformat.cpp b/source/pixelformat.cpp
index 320fef1f..0b13f3cc 100644
--- a/source/pixelformat.cpp
+++ b/source/pixelformat.cpp
@@ -77,6 +77,19 @@ PixelFormat storage_pixelformat_from_graphics(Graphics::PixelFormat pf, bool srg
 }
 
 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)
 	{
@@ -88,48 +101,90 @@ PixelFormat get_base_pixelformat(PixelFormat pf)
 	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 SLUMINANCE:
-	case SLUMINANCE8: return LUMINANCE;
-	case LUMINANCE_ALPHA8:
-	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: return DEPTH_COMPONENT;
+	case DEPTH_COMPONENT32:
+	case DEPTH_COMPONENT32F: return DEPTH_COMPONENT;
 	default: return pf;
 	}
 }
 
-PixelFormat get_sized_pixelformat(PixelFormat pf)
+PixelFormat get_sized_pixelformat(PixelFormat pf, unsigned size)
 {
-	switch(pf)
+	if(!size || size>4)
+		throw invalid_argument("get_sized_pixelformat");
+
+	pf = get_unsized_pixelformat(pf);
+
+	switch(size)
 	{
-	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;
-	case DEPTH_COMPONENT:
-		if(get_gl_api()==OPENGL_ES2)
-			return DEPTH_COMPONENT16;
+	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
-			return DEPTH_COMPONENT32;
-	default: return pf;
+			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)
@@ -201,6 +256,7 @@ unsigned get_component_size(PixelFormat pf)
 	case RGB32F:
 	case RGBA32F:
 	case DEPTH_COMPONENT32:
+	case DEPTH_COMPONENT32F:
 		return 4;
 	default:
 		return 0;
@@ -214,8 +270,17 @@ unsigned get_pixel_size(PixelFormat pf)
 
 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:
@@ -250,10 +315,19 @@ void require_pixelformat(PixelFormat pf)
 		{ 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;