fixed canvas:clear() when multi-canvas rendering is active, changed some names and wording

--HG--
branch : MRTs

src/modules/graphics/Graphics.cpp

@@ -158,7 +158,7 @@ StringMap<Graphics::Support, Graphics::SUPPORT_MAX_ENUM>::Entry Graphics::suppor
 {
 	{ "canvas", Graphics::SUPPORT_CANVAS },
 	{ "hdrcanvas", Graphics::SUPPORT_HDR_CANVAS },
-	{ "mrtcanvas", Graphics::SUPPORT_MRT_CANVAS },
+	{ "multicanvas", Graphics::SUPPORT_MULTI_CANVAS },
 	{ "shader", Graphics::SUPPORT_SHADER },
 	{ "npot", Graphics::SUPPORT_NPOT },
 	{ "subtractive", Graphics::SUPPORT_SUBTRACTIVE },

src/modules/graphics/Graphics.h

@@ -87,7 +87,7 @@ public:
 	{
 		SUPPORT_CANVAS = 1,
 		SUPPORT_HDR_CANVAS,
-		SUPPORT_MRT_CANVAS,
+		SUPPORT_MULTI_CANVAS,
 		SUPPORT_SHADER,
 		SUPPORT_NPOT,
 		SUPPORT_SUBTRACTIVE,

src/modules/graphics/opengl/Canvas.cpp

@@ -423,7 +423,7 @@ bool Canvas::isHDRSupported()
 	return GLEE_VERSION_3_0 || GLEE_ARB_texture_float;
 }
 
-bool Canvas::isMRTSupported()
+bool Canvas::isMultiCanvasSupported()
 {
 	if (!(isSupported() && (GLEE_VERSION_2_0 || GLEE_ARB_draw_buffers || GLEE_ATI_draw_buffers)))
 		return false;
@@ -434,7 +434,7 @@ bool Canvas::isMRTSupported()
 		glGetIntegerv(GL_MAX_DRAW_BUFFERS, &maxDrawBuffers);
 	}
 
-	// system must support at least 4 simultanious render targets
+	// system must support at least 4 simultanious active canvases
 	return maxFBOColorAttachments >= 4 && maxDrawBuffers >= 4;
 }
 
@@ -478,11 +478,11 @@ void Canvas::startGrab(const std::vector<Canvas *> &canvases)
 {
 	if (canvases.size() > 0)
 	{
-		if (!isMRTSupported())
-			throw love::Exception("Multiple render targets are not supported on this system.");
+		if (!isMultiCanvasSupported())
+			throw love::Exception("Multi-canvas rendering is not supported on this system.");
 
-		if (canvases.size() + 1 > maxDrawBuffers || canvases.size() + 1 > maxFBOColorAttachments)
-			throw love::Exception("This system can't support %d simultanious render targets.", canvases.size() + 1);
+		if (canvases.size()+1 > maxDrawBuffers || canvases.size()+1 > maxFBOColorAttachments)
+			throw love::Exception("This system can't simultaniously render to %d canvases.", canvases.size()+1);
 	}
 
 	for (size_t i = 0; i < canvases.size(); i++)
@@ -500,7 +500,7 @@ void Canvas::startGrab(const std::vector<Canvas *> &canvases)
 	if (canvases.size() == 0 && attachedCanvases.size() == 0)
 		return;
 
-	// attach the canvas textures to this FBO and set up multiple render targets
+	// attach the canvas textures to the active FBO and set up multiple render targets
 	strategy->setAttachments(canvases);
 
 	// retain newly attached canvases
@@ -521,7 +521,7 @@ void Canvas::startGrab()
 	if (attachedCanvases.size() == 0)
 		return;
 
-	// make sure the FBO is only using a single render target
+	// make sure the FBO is only using a single canvas
 	strategy->setAttachments();
 
 	// release any previously attached canvases
@@ -548,16 +548,31 @@ void Canvas::stopGrab()
 void Canvas::clear(const Color &c)
 {
 	GLuint previous = 0;
-	if (current != NULL)
-		previous = current->fbo;
 
-	strategy->bindFBO(fbo);
-	glPushAttrib(GL_COLOR_BUFFER_BIT);
+	if (current != this)
+	{
+		if (current != NULL)
+			previous = current->fbo;
+
+		strategy->bindFBO(fbo);
+		glPushAttrib(GL_COLOR_BUFFER_BIT);
+	}
+
+	// Make sure only this canvas is cleared when multi-canvas rendering is set
+	if (attachedCanvases.size() > 0)
+		strategy->setAttachments();
+
 	glClearColor((float)c.r/255.0f, (float)c.g/255.0f, (float)c.b/255.0f, (float)c.a/255.0f);
 	glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
-	glPopAttrib();
 
-	strategy->bindFBO(previous);
+	if (attachedCanvases.size() > 0)
+		strategy->setAttachments(attachedCanvases);
+
+	if (current != this)
+	{
+		glPopAttrib();
+		strategy->bindFBO(previous);
+	}
 }
 
 void Canvas::draw(float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky) const

src/modules/graphics/opengl/Canvas.h

@@ -101,7 +101,7 @@ public:
 
 	static bool isSupported();
 	static bool isHDRSupported();
-	static bool isMRTSupported();
+	static bool isMultiCanvasSupported();
 	static bool getConstant(const char *in, TextureType &out);
 	static bool getConstant(TextureType in, const char *&out);
 

src/modules/graphics/opengl/wrap_Graphics.cpp

@@ -1083,8 +1083,8 @@ int w_isSupported(lua_State *L)
 			if (!Canvas::isHDRSupported())
 				supported = false;
 			break;
-		case Graphics::SUPPORT_MRT_CANVAS:
-			if (!Canvas::isMRTSupported())
+		case Graphics::SUPPORT_MULTI_CANVAS:
+			if (!Canvas::isMultiCanvasSupported())
 				supported = false;
 			break;
 		case Graphics::SUPPORT_SHADER:

src/scripts/graphics.lua

@@ -1338,7 +1338,7 @@ void main() {
 	gl_FragColor = effect(VaryingColor, _tex0_, VaryingTexCoord.st, gl_FragCoord.xy);
 }]],
 
-		FOOTER_MRT = [[
+		FOOTER_MULTI_CANVAS = [[
 void main() {
 	// fix crashing issue in OSX when _tex0_ is unused within effect()
 	float dummy = texture2D(_tex0_, vec2(.5)).r;
@@ -1357,13 +1357,13 @@ void main() {
 		return table_concat(vertexcodes, "\n")
 	end
 
-	local function createPixelCode(pixelcode, is_mrt)
+	local function createPixelCode(pixelcode, is_multicanvas)
 		local pixelcodes = {
 			GLSL_VERSION,
 			GLSL_SYNTAX, GLSL_PIXEL.HEADER, GLSL_UNIFORMS,
 			"#line 0",
 			pixelcode,
-			is_mrt and GLSL_PIXEL.FOOTER_MRT or GLSL_PIXEL.FOOTER,
+			is_multicanvas and GLSL_PIXEL.FOOTER_MULTI_CANVAS or GLSL_PIXEL.FOOTER,
 		}
 		return table_concat(pixelcodes, "\n")
 	end
@@ -1375,7 +1375,7 @@ void main() {
 	local function isPixelCode(code)
 		if code:match("vec4%s*effect%(") then
 			return true
-		elseif code:match("void%s*effects%(") then -- multiple render targets (MRT)
+		elseif code:match("void%s*effects%(") then -- render to multiple canvases simultaniously
 			return true, true
 		else
 			return false
@@ -1384,7 +1384,7 @@ void main() {
 
 	function love.graphics._shaderCodeToGLSL(arg1, arg2)
 		local vertexcode, pixelcode
-		local is_mrt = false -- whether pixel code has "effects" function instead of "effect"
+		local is_multicanvas = false -- whether pixel code has "effects" function instead of "effect"
 		
 		if arg1 then
 			local s = arg1:gsub("\r\n\t", " ") -- convert whitespace to spaces for parsing
@@ -1394,10 +1394,10 @@ void main() {
 				vertexcode = arg1 -- first arg contains vertex shader code
 			end
 
-			local ispixel, isMRT = isPixelCode(s)
+			local ispixel, isMultiCanvas = isPixelCode(s)
 			if ispixel then
 				pixelcode = arg1 -- first arg contains pixel shader code
-				is_mrt = isMRT
+				is_multicanvas = isMultiCanvas
 			end
 		end
 		
@@ -1409,10 +1409,10 @@ void main() {
 				vertexcode = arg2 -- second arg contains vertex shader code
 			end
 
-			local ispixel, isMRT = isPixelCode(s)
+			local ispixel, isMultiCanvas = isPixelCode(s)
 			if ispixel then
 				pixelcode = arg2 -- second arg contains pixel shader code
-				is_mrt = isMRT
+				is_multicanvas = isMultiCanvas
 			end
 		end
 
@@ -1420,7 +1420,7 @@ void main() {
 			vertexcode = createVertexCode(vertexcode)
 		end
 		if pixelcode then
-			pixelcode = createPixelCode(pixelcode, is_mrt)
+			pixelcode = createPixelCode(pixelcode, is_multicanvas)
 		end
 
 		return vertexcode, pixelcode

src/scripts/graphics.lua.h

@@ -6348,7 +6348,8 @@ const unsigned char graphics_lua[] =
 	0x78, 0x43, 0x6f, 0x6f, 0x72, 0x64, 0x2e, 0x73, 0x74, 0x2c, 0x20, 0x67, 0x6c, 0x5f, 0x46, 0x72, 0x61, 0x67, 
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@@ -6383,7 +6384,8 @@ const unsigned char graphics_lua[] =
 	0x09, 0x65, 0x6e, 0x64, 0x0a,
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@@ -6392,10 +6394,11 @@ const unsigned char graphics_lua[] =
 	0x4c, 0x53, 0x4c, 0x5f, 0x55, 0x4e, 0x49, 0x46, 0x4f, 0x52, 0x4d, 0x53, 0x2c, 0x0a,
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@@ -6415,9 +6418,9 @@ const unsigned char graphics_lua[] =
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@@ -6429,11 +6432,12 @@ const unsigned char graphics_lua[] =
 	0x6f, 0x47, 0x4c, 0x53, 0x4c, 0x28, 0x61, 0x72, 0x67, 0x31, 0x2c, 0x20, 0x61, 0x72, 0x67, 0x32, 0x29, 0x0a,
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@@ -6453,14 +6457,15 @@ const unsigned char graphics_lua[] =
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@@ -6482,14 +6487,15 @@ const unsigned char graphics_lua[] =
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@@ -6502,7 +6508,8 @@ const unsigned char graphics_lua[] =
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