First prototype of new line rendering

shaders/lines/fs_lines.sc

@@ -0,0 +1,13 @@
+$input v_color0
+
+/*
+ * Copyright 2011-2015 Branimir Karadzic. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+void main()
+{
+	gl_FragColor = v_color0;
+}

shaders/lines/varying.def.sc

@@ -0,0 +1,7 @@
+vec4 v_color0      : COLOR0     = vec4(1.0, 0.0, 1.0, 1.0);
+
+vec3  a_position   : POSITION;
+vec3  a_texcoord0  : TEXCOORD0  = vec3(1.0, 0.0, 1.0);
+vec3  a_texcoord1  : TEXCOORD1  = vec3(1.0, 0.0, 1.0);
+float a_texcoord2  : TEXCOORD2  = 0.0;
+

shaders/lines/vs_lines.sc

@@ -0,0 +1,65 @@
+$input a_position, a_texcoord0, a_texcoord1, a_texcoord2
+$output v_color0
+
+/*
+ * Copyright 2011-2015 Branimir Karadzic. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+uniform vec4 u_line_params;
+
+#define thickness u_line_params.x
+#define miter u_line_params.y
+#define width u_line_params.z
+#define height u_line_params.w
+#define current_pos a_position
+#define prev_pos a_texcoord0
+#define next_pos a_texcoord1
+#define direction a_texcoord2
+
+void main()
+{
+	float aspect = width / height;
+	vec2 aspect_vec = vec2(aspect, 1.0);
+
+  vec4 current_proj = mul(u_modelViewProj, vec4(current_pos, 1.0));
+  vec4 prev_proj = mul(u_modelViewProj, vec4(prev_pos, 1.0));
+  vec4 next_proj = mul(u_modelViewProj, vec4(next_pos, 1.0));
+
+	vec2 current_screen = current_proj.xy / current_proj.w * aspect_vec;
+	vec2 prev_screen = prev_proj.xy / prev_proj.w * aspect_vec;
+	vec2 next_screen = next_proj.xy / next_proj.w * aspect_vec;
+
+	float len = thickness;
+	float orientation = direction;
+
+	vec2 dir = vec2(0.0);
+	if (current_screen == prev_screen) {
+		dir = normalize(next_screen - current_screen);
+	} else if (current_screen == next_screen) {
+		dir = normalize (current_screen - prev_screen);
+	} else {
+		vec2 dirA = normalize (current_screen - prev_screen);
+		if (miter == 1) {
+      vec2 dirB = normalize(next_screen - current_screen);
+      //now compute the miter join normal and length
+      vec2 tangent = normalize(dirA + dirB);
+      vec2 perp = vec2(-dirA.y, dirA.x);
+      vec2 miter_vec = vec2(-tangent.y, tangent.x);
+      dir = tangent;
+      len = thickness / dot(miter_vec, perp);
+		} else {
+			dir = dirA;
+		}
+	}
+
+	vec2 normal = vec2(-dir.y, dir.x);
+	normal *= len/2.0;
+	normal.x /= aspect;
+
+	vec4 offset = vec4(normal * orientation, 0.0, 0.0);
+	gl_Position = current_proj + offset;
+	v_color0 = vec4(1.0, 0.0, 1.0, 1.0);
+}

src/modules/RenderModule.cc

@@ -84,6 +84,7 @@ static void module_reload(struct module_state *state) {
 	assert (camera != nullptr);
 
 	SerializeBool (*gReadSerializer, "protot.RenderModule.draw_floor", gRenderer->drawFloor);
+	SerializeBool (*gReadSerializer, "protot.RenderModule.draw_skybox", gRenderer->drawSkybox);
 	SerializeBool (*gReadSerializer, "protot.RenderModule.debug_enabled", gRenderer->drawDebug);
 	SerializeVec3 (*gReadSerializer, "protot.RenderModule.camera.eye", camera->eye);
 	SerializeVec3 (*gReadSerializer, "protot.RenderModule.camera.poi", camera->poi);
@@ -97,6 +98,7 @@ static void module_unload(struct module_state *state) {
 	//(*gSerializer)["protot"]["RenderModule"]["active_camera"] = (double)gRenderer->activeCameraIndex;
 
 	SerializeBool (*gWriteSerializer, "protot.RenderModule.draw_floor", gRenderer->drawFloor);
+	SerializeBool (*gWriteSerializer, "protot.RenderModule.draw_skybox", gRenderer->drawSkybox);
 	SerializeBool (*gWriteSerializer, "protot.RenderModule.debug_enabled", gRenderer->drawDebug);
 	SerializeVec3 (*gWriteSerializer, "protot.RenderModule.camera.eye", camera->eye);
 	SerializeVec3 (*gWriteSerializer, "protot.RenderModule.camera.poi", camera->poi);
@@ -149,7 +151,7 @@ bgfx::DynamicIndexBufferHandle debug_lines_ibh;
 
 bgfx::UniformHandle u_time;
 bgfx::UniformHandle u_color;
-bgfx::UniformHandle u_lineparams;
+bgfx::UniformHandle u_line_params;
 
 bgfx::UniformHandle u_mtx;
 bgfx::UniformHandle u_exposure;
@@ -432,9 +434,7 @@ RenderState s_renderStates[RenderState::Count] = {
 		| BGFX_STATE_RGB_WRITE
 		| BGFX_STATE_ALPHA_WRITE
 		| BGFX_STATE_DEPTH_WRITE
-		| BGFX_STATE_DEPTH_TEST_LESS
+		| BGFX_STATE_DEPTH_TEST_ALWAYS
-//		| BGFX_STATE_CULL_CCW
-//		| BGFX_STATE_PT_LINESTRIP
 		| BGFX_STATE_MSAA,
 		0,
 		RenderProgram(),
@@ -449,6 +449,7 @@ RenderState s_renderStates[RenderState::Count] = {
 		| BGFX_STATE_DEPTH_TEST_LESS
 		| BGFX_STATE_CULL_CCW
 		| BGFX_STATE_PT_LINES
+//		| BGFX_STATE_PT_POINTS
 		| BGFX_STATE_MSAA,
 		0,
 		RenderProgram(),
@@ -552,6 +553,32 @@ struct PosColorTexCoord0Vertex
 
 bgfx::VertexDecl PosColorTexCoord0Vertex::ms_decl;
 
+// Used for lines
+struct PathVertex
+{
+	float position[3];
+	float prev[3];
+	float next[3];
+	// TODO: use an int for the direction
+	float direction;
+
+	static void init()
+	{
+		ms_decl
+			.begin()
+			.add(bgfx::Attrib::Position,  3, bgfx::AttribType::Float)
+			.add(bgfx::Attrib::TexCoord0, 3, bgfx::AttribType::Float)
+			.add(bgfx::Attrib::TexCoord1, 3, bgfx::AttribType::Float)
+			.add(bgfx::Attrib::TexCoord2, 1, bgfx::AttribType::Float)
+			.end();
+	}
+
+	static bgfx::VertexDecl ms_decl;
+};
+bgfx::VertexDecl PathVertex::ms_decl;
+
+
+
 // 
 // Static geometries
 // 
@@ -755,6 +782,7 @@ void Renderer::createGeometries() {
 	PosNormalVertex::init();
 	PosNormalColorTexcoordVertex::init();
 	PosColorTexCoord0Vertex::init();
+	PathVertex::init();
 
 	// Create static vertex buffer.
 	cube_vbh = bgfx::createVertexBuffer(
@@ -775,6 +803,18 @@ void Renderer::createGeometries() {
 			bgfx::makeRef(s_cubeEdgeIndices, sizeof(s_cubeEdgeIndices) )
 			);
 
+	// Create dynamic debug line buffer
+	path_lines_vbh = bgfx::createDynamicVertexBuffer(
+			(uint32_t) 1,
+			PathVertex::ms_decl,
+			BGFX_BUFFER_ALLOW_RESIZE
+			);
+
+	path_lines_ibh= bgfx::createDynamicIndexBuffer(
+			(uint32_t) 1,
+			BGFX_BUFFER_ALLOW_RESIZE
+			);
+
 	// Create dynamic debug line buffer
 	debug_lines_vbh = bgfx::createDynamicVertexBuffer(
 			(uint32_t) 1,
@@ -841,7 +881,7 @@ void Renderer::setupShaders() {
 
 	u_time = bgfx::createUniform("u_time", bgfx::UniformType::Vec4);
 	u_color = bgfx::createUniform("u_color", bgfx::UniformType::Vec4);
-	u_lineparams = bgfx::createUniform("u_lineparams", bgfx::UniformType::Vec4);
+	u_line_params = bgfx::createUniform("u_line_params", bgfx::UniformType::Vec4);
 
 	m_timeOffset = bx::getHPCounter();
 
@@ -904,7 +944,7 @@ void Renderer::setupShaders() {
 		lights[0].shadowMapFB = bgfx::createFrameBuffer(BX_COUNTOF(fbtextures), fbtextures, true);
 	}
 
-	s_renderStates[RenderState::Lines].m_program = RenderProgram("shaders/src/vs_lines.sc", "shaders/src/fs_lines.sc");
+	s_renderStates[RenderState::Lines].m_program = RenderProgram("shaders/lines/vs_lines.sc", "shaders/lines/fs_lines.sc");
 
 	s_renderStates[RenderState::Debug].m_program = RenderProgram("shaders/src/vs_debug.sc", "shaders/src/fs_debug.sc");
 }
@@ -1087,7 +1127,7 @@ void Renderer::shutdown() {
 
 	bgfx::destroyUniform(u_time);
 	bgfx::destroyUniform(u_color);
-	bgfx::destroyUniform(u_lineparams);
+	bgfx::destroyUniform(u_line_params);
 
 	for (uint8_t ii = 0; ii < RenderState::Count; ++ii) {
 		if (bgfx::isValid(s_renderStates[ii].m_program.program)) {
@@ -1279,7 +1319,7 @@ void Renderer::paintGL() {
 	// Clear backbuffer and shadowmap framebuffer at beginning.
 	bgfx::setViewClear(RenderState::Skybox
 			, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH
-			, 0xf03030ff, 1.0f, 0
+			, 0x000000ff, 1.0f, 0
 			);
 
 	bgfx::setViewClear(RenderState::ShadowMap
@@ -1295,6 +1335,7 @@ void Renderer::paintGL() {
 	bgfx::touch(RenderState::Scene);
 	bgfx::touch(RenderState::Skybox);
 
+	if (drawSkybox) {
 		// Skybox pass
 		memcpy (IBL::uniforms.m_cameraPos, cameras[activeCameraIndex].eye.data(), 3 * sizeof(float));
 
@@ -1318,6 +1359,7 @@ void Renderer::paintGL() {
 
 		IBL::uniforms.submit();
 		bgfx::submit(RenderState::Skybox, s_renderStates[RenderState::Skybox].m_program.program);
+	}
 
 	if (drawFloor)
 	{
@@ -1374,6 +1416,109 @@ void Renderer::paintGL() {
 		meshSubmit(entities[i]->mesh, &s_renderStates[RenderState::Scene], 1, entities[i]->transform);
 	}
 
+	// drawLinesHere
+	{
+		Path test_path;
+
+		test_path.points.push_back(Vector3f (0.f, -1.f, 0.f));
+		test_path.points.push_back(Vector3f (1.f, -1.f, 0.f));
+		test_path.points.push_back(Vector3f (0.f,  0.f, 0.f));
+		test_path.points.push_back(Vector3f (1.f,  0.f, 0.f));
+		test_path.points.push_back(Vector3f (0.25f, -0.75f, 0.f));
+
+		// create an array for the actual buffer
+		std::vector<PathVertex> path_vertices;
+
+		// note: we submit each vertex twice
+		for (int i = 0; i < test_path.points.size(); i++) {
+			PathVertex vertex;
+			memcpy (vertex.position, test_path.points[i].data(), sizeof(float) * 3);
+			if (i == 0) {
+				assert (test_path.points.size() > 1);
+				memcpy (vertex.prev, test_path.points[i].data(), sizeof(float) * 3);
+				memcpy (vertex.next, test_path.points[i + 1].data(), sizeof(float) * 3);
+			} else if (i == test_path.points.size() - 1) {
+				memcpy (vertex.next, test_path.points[i].data(), sizeof(float) * 3);
+				memcpy (vertex.prev, test_path.points[i - 1].data(), sizeof(float) * 3);
+			} else { 
+				memcpy (vertex.prev, test_path.points[i - 1].data(), sizeof(float) * 3);
+				memcpy (vertex.next, test_path.points[i + 1].data(), sizeof(float) * 3);
+			}
+			vertex.direction = -1.0f;
+			path_vertices.push_back(vertex);
+			vertex.direction =  1.0f;
+			path_vertices.push_back(vertex);
+		}
+
+//		PathVertex* v = (PathVertex*) path_vertices.data();
+//		int vi = 0;
+//		while (vi < path_vertices.size()) {
+//			cout << vi << ": v=" << v->position[0] << ", " << v->position[1] << ", " << v->position[2]
+//				<< " p=" << v->prev[0] << ", " << v->prev[1] << ", " << v->prev[2] << ", "
+//				<< " n=" << v->next[0] << ", " << v->next[1] << ", " << v->next[2] << ", "
+//				<< " d=" << v->direction << endl;
+//
+//			v++;
+//			vi++;
+//		}
+
+		// update buffer from buffer data
+		bgfx::updateDynamicVertexBuffer (path_lines_vbh,
+			0,
+			bgfx::copy(path_vertices.data(), sizeof(PathVertex) * path_vertices.size())
+			);
+
+		std::vector<uint16_t> line_indices;
+		int index = 0;
+		for (int i = 0; i < test_path.points.size() - 1; i++) {
+			int j = index;
+			line_indices.push_back(j + 0);
+			line_indices.push_back(j + 1);
+			line_indices.push_back(j + 2);
+			line_indices.push_back(j + 2);
+			line_indices.push_back(j + 1);
+			line_indices.push_back(j + 3);
+			index += 2;
+		}
+
+//		for (int i = 0; i < line_indices.size(); i++) {
+//			cout << line_indices[i] << ", ";
+//		}
+//		cout << endl;
+//
+//		cout << "points: " << test_path.points.size()
+//			<< ", line indices: " << line_indices.size()
+//			<< ", path_vertices: " << path_vertices.size() 
+//			<< ", last line index: " << line_indices[line_indices.size() -1] 
+//			<< ", width = " << width << ", height = " << height
+//			<< endl;
+
+//		assert (line_indices[line_indices.size() -1] < path_vertices.size());
+//		assert (line_indices.size() == test_path.points.size() * 3);
+
+		bgfx::updateDynamicIndexBuffer (path_lines_ibh,
+			0,
+			bgfx::copy(line_indices.data(), sizeof(uint16_t) * line_indices.size())
+			);
+
+		// submit data
+		const RenderState& st = s_renderStates[RenderState::Lines];
+
+		float thickness = 0.1f;
+		float miter = 1.f;
+		float aspect = width / height;
+
+		Vector4f params (thickness, miter, width, height);
+
+		Camera &active_camera = cameras[activeCameraIndex];
+
+		bgfx::setUniform(u_line_params, params.data(), 1);
+		bgfx::setIndexBuffer(path_lines_ibh);
+		bgfx::setVertexBuffer(path_lines_vbh);
+		bgfx::setState(st.m_state);
+		bgfx::submit(st.m_viewId, st.m_program.program);
+	}
+
 	// render debug information
 	if (drawDebug) {
 		float tmp[16];
@@ -1495,7 +1640,7 @@ void Renderer::paintGL() {
 			width,
 			height);
 
-	ImGui::SetNextWindowSize (ImVec2(400.f, 200.0f), ImGuiSetCond_Once);
+	ImGui::SetNextWindowSize (ImVec2(400.f, 300.0f), ImGuiSetCond_Once);
 	ImGui::SetNextWindowPos (ImVec2(10.f, 300.0f), ImGuiSetCond_Once);
 
 	ImGui::Begin("Render Settings");
@@ -1520,6 +1665,7 @@ void Renderer::paintGL() {
 	assert (lights.size() == 1);
 
 	ImGui::Checkbox("Draw Floor", &drawFloor);
+	ImGui::Checkbox("Draw Skybox", &drawSkybox);
 	ImGui::Checkbox("Draw Debug", &drawDebug);
 
 	for (int i = 0; i < lights.size(); i++) {

src/modules/RenderModule.h

@@ -176,6 +176,10 @@ struct LightProbe
 	bgfx::TextureHandle m_texIrr;
 };
 
+struct Path {
+	std::vector<SimpleMath::Vector3f> points;
+};
+
 struct DebugCommand {
 	enum CommandType {
 		Line,
@@ -194,6 +198,7 @@ struct Renderer {
 	bool initialized;
 	bool drawDebug;
 	bool drawFloor = true;
+	bool drawSkybox = true;
 	uint32_t width;
 	uint32_t height;
 

src/modules/RenderUtils.cc

@@ -215,20 +215,25 @@ bgfx::ProgramHandle loadProgram(const char* _vsName, const char* _fsName)
 
 bgfx::ProgramHandle loadProgramFromFiles(const char *_vsFileName, const char *_fsFileName) {
 	std::cout << "Loading shader " << _vsFileName << std::endl;
-	const char* argv[11];
+	const char* argv[10];
 	argv[0] = "--type";
 	argv[1] = "vertex";
 	argv[2] = "--platform";
 	argv[3] = "linux";
 	argv[4] = "-i";
 	argv[5] = "shaders/common";
-	argv[6] = "--varyingdef";
+	argv[6] = "-p";
-	argv[7] = "-p";
+	argv[7] = "120";
-	argv[8] = "120";
+	argv[8] = "-f";
-	argv[9] = "-f";
+	argv[9] = _vsFileName;
-	argv[10] = _vsFileName;
 	
-	bx::CommandLine cmdLine (11, argv);
+//	argv[6] = "--varyingdef";
+//	argv[7] = "-p";
+//	argv[8] = "120";
+//	argv[9] = "-f";
+//	argv[10] = _vsFileName;
+
+	bx::CommandLine cmdLine (10, argv);
 
 	const bgfx::Memory* vs_source_memory = loadMem(entry::getFileReader(), _vsFileName);
 	bx::ReaderSeekerI* vs_source_reader = new bx::MemoryReader (vs_source_memory->data, vs_source_memory->size);