From: John Tsiombikas <nuclear@member.fsf.org>
Date: Sun, 21 Jan 2018 03:01:16 +0000 (+0200)
Subject: exhibit description text rendering
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=laserbrain_demo;a=commitdiff_plain;h=dda1406df303fd1ec73344fbcce34c6197138642

exhibit description text rendering
---

diff --git a/src/app.cc b/src/app.cc
index 7f173f3..9a46f4a 100644
--- a/src/app.cc
+++ b/src/app.cc
@@ -364,7 +364,7 @@ static void update(float dt)
 	} else {
 		// TODO do this properly
 		// set the position of the left hand at a suitable position for the exhibit UI
-		dir = transpose(mouse_view_matrix.upper3x3()) * Vec3(-0.47, 0, -1);
+		dir = rotate(Vec3(-0.46, -0.1, -1), Vec3(0, 1, 0), deg_to_rad(-avatar.body_rot));
 		exslot_left.node.set_position(avatar.pos + dir * 30); // magic: distance in front
 	}
 
diff --git a/src/geomdraw.cc b/src/geomdraw.cc
index b348f87..6dc25ce 100644
--- a/src/geomdraw.cc
+++ b/src/geomdraw.cc
@@ -58,6 +58,7 @@ static void draw_box(const Box *box)
 	glPushMatrix();
 	glMultMatrixf(box->xform[0]);
 
+	glLineWidth(1.0);
 	glBegin(GL_LINES);
 	glColor3f(1, 1, 0);
 	for(int i=0; i<12; i++) {
diff --git a/src/ui_exhibit.cc b/src/ui_exhibit.cc
index 9b42c45..e583e5d 100644
--- a/src/ui_exhibit.cc
+++ b/src/ui_exhibit.cc
@@ -1,3 +1,9 @@
+#include <assert.h>
+#if defined(WIN32) || defined(__WIN32__)
+#include <malloc.h>
+#else
+#include <alloca.h>
+#endif
 #include <drawtext.h>
 #include "ui_exhibit.h"
 #include "ui.h"
@@ -29,11 +35,12 @@ static Exhibit *ex;
 static int vis_tab;
 static float scroll;
 static std::vector<const char*> text_lines;
+static int max_line_size;
 static AudioStream *voice;
 
 enum {COL_BG, COL_FG, COL_FRM};
 static float color[][3] = {
-	{0.09, 0.14, 0.2},	// COL_BG
+	{0.014, 0.016, 0.04},	// COL_BG
 	{0.31, 0.58, 0.9},	// COL_FG
 	{0.19, 0.23, 0.46}	// COL_FRM
 };
@@ -43,14 +50,14 @@ bool exui_init()
 {
 	size.x = 15;
 	size.y = 18;
-	text_padding = ui_width / 100;
+	text_padding = 6;
 
 	aspect = size.x / size.y;
 	ui_height = 512;
 	ui_width = ui_height * aspect;
 
 	rtarg = new RenderTarget;
-	if(!rtarg->create(ui_width, ui_height, GL_RGBA)) {
+	if(!rtarg->create(ui_width, ui_height, GL_SRGB_ALPHA)) {
 		error_log("failed to create exui render target\n");
 		return false;
 	}
@@ -132,11 +139,11 @@ static void draw_2d_ui()
 
 	Rect rect = {0, 0, (float)ui_width, (float)ui_height};
 	draw_frame(rect);
-	Rect tbar_rect = {rect.x, rect.y, rect.w, rowspc};
+	Rect tbar_rect = {rect.x, rect.y, rect.w, rowspc + text_padding};	// half the padding
 	draw_titlebar(tbar_rect);
-	Rect tabs_rect = {tbar_rect.x, tbar_rect.y + rowspc, tbar_rect.w, tbar_rect.h};
+	Rect tabs_rect = {tbar_rect.x, tbar_rect.y + tbar_rect.h, tbar_rect.w, tbar_rect.h};
 	draw_tabs(tabs_rect);
-	Rect text_rect = {rect.x, tabs_rect.y + rowspc, rect.w, rect.h - tabs_rect.y - rowspc};
+	Rect text_rect = {rect.x, tabs_rect.y + tabs_rect.h, rect.w, rect.h - tabs_rect.y - tabs_rect.h};
 	draw_text(text_rect);
 
 	glPopAttrib();
@@ -231,7 +238,7 @@ static inline void draw_rect(const Rect &rect, int col)
 static void draw_frame(const Rect &rect)
 {
 	draw_rect(rect, COL_BG);
-	glLineWidth(2.0);
+	glLineWidth(3.0);
 	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 	draw_rect(rect, COL_FRM);
 	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
@@ -259,6 +266,33 @@ static void draw_tabs(const Rect &rect)
 
 static void draw_text(const Rect &rect)
 {
+	char *buf = (char*)alloca(max_line_size + 1);
+
+	float dy = dtx_line_height() * text_scale;
+
+	glMatrixMode(GL_MODELVIEW);
+	glPushMatrix();
+	glTranslatef(rect.x + text_padding, rect.y + dy + text_padding, 0);
+	glScalef(text_scale, -text_scale, text_scale);
+
+	glColor3fv(color[COL_FG]);
+
+	int nlines = text_lines.size() - 1;
+	for(int i=0; i<nlines; i++) {
+		if(i < nlines - 1) {
+			int sz = text_lines[i + 1] - text_lines[i];
+			assert(sz <= max_line_size);
+			memcpy(buf, text_lines[i], sz);
+			buf[sz] = 0;
+		} else {
+			buf = (char*)text_lines[i];
+		}
+
+		dtx_string(buf);
+		glTranslatef(0, -dy, 0);
+	}
+
+	glPopMatrix();
 }
 
 static void layout_text(const char *text)
@@ -269,31 +303,36 @@ static void layout_text(const char *text)
 
 	dtx_use_font(ui_font, ui_font_size);
 
-	float pos = text_padding;
+	int left_margin = text_padding;
+	int right_margin = ui_width - text_padding;
+
 	text_lines.push_back(text);
 	const char *last_break = 0;
+	max_line_size = 1;
 
 	while(*text) {
 		if(*text == '\n') {	// paragraph break
 			text_lines.push_back(text);
 			text_lines.push_back(++text);
-			pos = text_padding;
 			last_break = 0;
 			continue;
 		}
 
 		int code = dtx_utf8_char_code(text);
 		const char *next = dtx_utf8_next_char((char*)text);
-		pos += dtx_glyph_width(code) * text_scale;
+
+		struct dtx_box box;
+		dtx_substring_box(text_lines.back(), 0, text - text_lines.back(), &box);
+		float pos = left_margin + (box.width + box.x) * text_scale;
 
 		if(code < 256 && isspace(code)) {
 			last_break = text;
 		}
 
-		if(pos >= ui_width - text_padding) {
+		if(pos > right_margin) {
 			if(text == text_lines.back()) {
 				// not even a single character fits on a line... abort
-				warning_log("text layout failed. glyph %d doesn't fit in line (%d)\n", code, ui_width - 2 * text_padding);
+				warning_log("text layout failed. glyph %d doesn't fit in line (%d)\n", code, right_margin - left_margin);
 				text_lines.clear();
 				return;
 			}
@@ -304,7 +343,9 @@ static void layout_text(const char *text)
 				// no good point to break, just break here
 				text_lines.push_back(text);
 			}
-			pos = text_padding;
+
+			int d = text_lines.back() - (text_lines[text_lines.size() - 2]);
+			if(d > max_line_size) max_line_size = d;
 		}
 		text = next;
 	}