[wip, win32, canvas] segment setup, non tiled

src/gl_canvas.c

@@ -126,7 +126,9 @@ typedef struct mg_gl_canvas_backend
 
 	/*
 	GLuint pathSetup;
+	*/
 	GLuint segmentSetup;
+	/*
 	GLuint backprop;
 	GLuint merge;
 	*/
@@ -253,23 +255,19 @@ void mg_gl_render_batch(mg_gl_canvas_backend* backend,
 	glUniform1f(1, scale);
 
 	glDispatchCompute(pathCount, 1, 1);
-
+	*/
 	//NOTE: segment setup pass
 	glUseProgram(backend->segmentSetup);
 
 	glBindBufferRange(GL_SHADER_STORAGE_BUFFER, 0, backend->elementBuffer, backend->elementBufferOffset, eltCount*sizeof(mg_gl_path_elt));
 	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, backend->segmentCountBuffer);
 	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, backend->segmentBuffer);
-	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, backend->pathQueueBuffer);
-	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 4, backend->tileQueueBuffer);
-	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 5, backend->tileOpBuffer);
-	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 6, backend->tileOpCountBuffer);
 
-	glUniform1i(0, tileSize);
+	glUniform1f(0, scale);
-	glUniform1f(1, scale);
 
 	glDispatchCompute(eltCount, 1, 1);
 
+	/*
 	//NOTE: backprop pass
 	glUseProgram(backend->backprop);
 
@@ -307,11 +305,11 @@ void mg_gl_render_batch(mg_gl_canvas_backend* backend,
 	glUniform1i(2, backend->msaaCount);
 */
 	glBindBufferRange(GL_SHADER_STORAGE_BUFFER, 0, backend->pathBuffer, backend->pathBufferOffset, pathCount*sizeof(mg_gl_path));
-	glBindBufferRange(GL_SHADER_STORAGE_BUFFER, 1, backend->elementBuffer, backend->elementBufferOffset, eltCount*sizeof(mg_gl_path_elt));
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, backend->segmentCountBuffer);
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, backend->segmentBuffer);
 
 //	glUniform1ui(0, tileSize);
-	glUniform1f(1, scale);
+//	glUniform1f(1, scale);
-	glUniform1ui(2, eltCount);
 
 	int err = glGetError();
 	if(err)
@@ -745,7 +743,9 @@ mg_canvas_backend* gl_canvas_backend_create(mg_wgl_surface* surface)
 		int err = 0;
 		/*
 		err |= mg_gl_canvas_compile_compute_program(glsl_path_setup, &backend->pathSetup);
+		*/
 		err |= mg_gl_canvas_compile_compute_program(glsl_segment_setup, &backend->segmentSetup);
+		/*
 		err |= mg_gl_canvas_compile_compute_program(glsl_backprop, &backend->backprop);
 		err |= mg_gl_canvas_compile_compute_program(glsl_merge, &backend->merge);
 		*/

src/glsl_shaders/raster.glsl

@@ -9,71 +9,21 @@ layout(binding = 0) restrict readonly buffer pathBufferSSBO
 	mg_gl_path elements[];
 } pathBuffer;
 
-layout(binding = 1) restrict readonly buffer elementBufferSSBO
+layout(binding = 1) restrict readonly buffer segmentBufferCountSSBO
 {
-	mg_gl_path_elt elements[];
+	int elements[];
-} elementBuffer;
+} segmentCountBuffer;
+
+layout(binding = 2) restrict readonly buffer segmentBufferSSBO
+{
+	mg_gl_segment elements[];
+} segmentBuffer;
 
 //layout(location = 0) uniform uint tileSize; // this has to be commented until it's effectively used!!
-layout(location = 1) uniform float scale;
+//layout(location = 0) uniform float scale;
-layout(location = 2) uniform uint eltCount;
 
 layout(rgba8, binding = 0) uniform restrict writeonly image2D outTexture;
 
-void init_segment(in vec2 p[4], int kind, out mg_gl_segment seg)
-{
-	vec2 s = p[0];
-	vec2 c = p[0];
-	vec2 e = p[1];
-
-	bool goingUp = e.y >= s.y;
-	bool goingRight = e.x >= s.x;
-
-	seg.kind = kind;
-	seg.pathIndex = 0; ///
-	seg.windingIncrement = goingUp ? 1 : -1;
-	seg.box = vec4(min(s.x, e.x),
-	               min(s.y, e.y),
-	               max(s.x, e.x),
-	               max(s.y, e.y));
-
-	float dx = c.x - seg.box.x;
-	float dy = c.y - seg.box.y;
-	float alpha = (seg.box.w - seg.box.y)/(seg.box.z - seg.box.x);
-	float ofs = seg.box.w - seg.box.y;
-
-	if(goingUp == goingRight)
-	{
-		if(seg.kind == MG_GL_LINE)
-		{
-			seg.config = MG_GL_BR;
-		}
-		else if(dy > alpha*dx)
-		{
-			seg.config = MG_GL_TL;
-		}
-		else
-		{
-			seg.config = MG_GL_BR;
-		}
-	}
-	else
-	{
-		if(seg.kind == MG_GL_LINE)
-		{
-			seg.config = MG_GL_TR;
-		}
-		else if(dy < ofs - alpha*dx)
-		{
-			seg.config = MG_GL_BL;
-		}
-		else
-		{
-			seg.config = MG_GL_TR;
-		}
-	}
-}
-
 float ccw(vec2 a, vec2 b, vec2 c)
 {
 	return((b.x-a.x)*(c.y-a.y) - (b.y-a.y)*(c.x-a.x));
@@ -171,22 +121,14 @@ int side_of_segment(vec2 p, mg_gl_segment seg)
 
 void main()
 {
+	int segCount = segmentCountBuffer.elements[0];
 	vec2 sampleCoord = vec2(gl_WorkGroupID.xy*uvec2(16, 16) + gl_LocalInvocationID.xy);
 
 	int winding = 0;
 
-	for(int i=0; i<eltCount; i++)
+	for(int segIndex=0; segIndex<segCount; segIndex++)
 	{
-		mg_gl_path_elt elt = elementBuffer.elements[i];
+		mg_gl_segment seg = segmentBuffer.elements[segIndex];
-
-		switch(elt.kind)
-		{
-			case MG_GL_LINE:
-			{
-				vec2 p[4] = {elt.p[0]*scale, elt.p[1]*scale, vec2(0), vec2(0)};
-				mg_gl_segment seg;
-				init_segment(p, MG_GL_LINE, seg);
-				seg.hullVertex = p[0];
 
 		if( (sampleCoord.y > seg.box.y)
 		  &&(sampleCoord.y <= seg.box.w)
@@ -210,17 +152,11 @@ void main()
 			}
 		}
 		*/
-
-			} break;
-
-			case MG_GL_QUADRATIC:
-			case MG_GL_CUBIC:
-				break;
-		}
 	}
 
 	int pathIndex = 0;
-	vec4 clip = pathBuffer.elements[pathIndex].clip * scale;
+
+//	vec4 clip = pathBuffer.elements[pathIndex].clip * scale;
 
 /*	if(  sampleCoord.x >= clip.x
 	  && sampleCoord.x < clip.z

src/glsl_shaders/segment_setup.glsl

@@ -19,28 +19,92 @@ layout(binding = 2) restrict writeonly buffer segmentBufferSSBO
 	mg_gl_segment elements[];
 } segmentBuffer;
 
-layout(binding = 3) restrict readonly buffer pathQueueBufferSSBO
+layout(location = 0) uniform float scale;
-{
-	mg_gl_path_queue elements[];
-} pathQueueBuffer;
 
-layout(binding = 4) restrict readonly buffer tileQueueBufferSSBO
-{
-	mg_gl_tile_queue elements[];
-} tileQueueBuffer;
 
-layout(binding = 5) restrict readonly buffer tileOpBufferSSBO
+int push_segment(in vec2 p[4], int kind)
 {
-	mg_gl_tile_op elements[];
+	int segIndex = atomicAdd(segmentCountBuffer.elements[0], 1);
-} tileOpBuffer;
 
-layout(binding = 6) restrict readonly buffer tileOpCountBufferSSBO
+	vec2 s = p[0];
+	vec2 c = p[0];
+	vec2 e = p[1];
+
+	bool goingUp = e.y >= s.y;
+	bool goingRight = e.x >= s.x;
+
+	vec4 box = vec4(min(s.x, e.x),
+	                min(s.y, e.y),
+	                max(s.x, e.x),
+	                max(s.y, e.y));
+
+	segmentBuffer.elements[segIndex].kind = kind;
+	segmentBuffer.elements[segIndex].pathIndex = 0; ///
+	segmentBuffer.elements[segIndex].windingIncrement = goingUp ? 1 : -1;
+	segmentBuffer.elements[segIndex].box = box;
+
+	float dx = c.x - box.x;
+	float dy = c.y - box.y;
+	float alpha = (box.w - box.y)/(box.z - box.x);
+	float ofs = box.w - box.y;
+
+	if(goingUp == goingRight)
 	{
-	int elements[];
+		if(kind == MG_GL_LINE)
-} tileOpCountBuffer;
+		{
+			segmentBuffer.elements[segIndex].config = MG_GL_BR;
+		}
+		else if(dy > alpha*dx)
+		{
+			segmentBuffer.elements[segIndex].config = MG_GL_TL;
+		}
+		else
+		{
+			segmentBuffer.elements[segIndex].config = MG_GL_BR;
+		}
+	}
+	else
+	{
+		if(kind == MG_GL_LINE)
+		{
+			segmentBuffer.elements[segIndex].config = MG_GL_TR;
+		}
+		else if(dy < ofs - alpha*dx)
+		{
+			segmentBuffer.elements[segIndex].config = MG_GL_BL;
+		}
+		else
+		{
+			segmentBuffer.elements[segIndex].config = MG_GL_TR;
+		}
+	}
 
+	return(segIndex);
+}
+
+void line_setup(vec2 p[4])
+{
+	int segIndex = push_segment(p, MG_GL_LINE);
+	segmentBuffer.elements[segIndex].hullVertex = p[0];
+
+	//TODO later bin to tiles
+}
 
 void main()
 {
+	int eltIndex = int(gl_WorkGroupID.x);
 
+	mg_gl_path_elt elt = elementBuffer.elements[eltIndex];
+
+	switch(elt.kind)
+	{
+		case MG_GL_LINE:
+		{
+			vec2 p[4] = {elt.p[0]*scale, elt.p[1]*scale, vec2(0), vec2(0)};
+			line_setup(p);
+		} break;
+
+		default:
+			break;
+	}
 }