MYST3: Add support for drawing 2D text

engines/myst3/gfx.cpp

@@ -1,23 +1,23 @@
-/* ResidualVM - A 3D game interpreter
- *
- * ResidualVM is the legal property of its developers, whose names
- * are too numerous to list here. Please refer to the AUTHORS
- * file distributed with this source distribution.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
-
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
-
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
+/* ResidualVM - A 3D game interpreter
+ *
+ * ResidualVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the AUTHORS
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
  */
 
 #if defined(WIN32)
@@ -103,10 +103,13 @@ void OpenGLTexture::update(const Graphics::Surface *surface) {
 }
 
 Renderer::Renderer(OSystem *system) :
-	_system(system) {
+	_system(system),
+	_font(0) {
 }
 
 Renderer::~Renderer() {
+	if (_font)
+		freeTexture(_font);
 }
 
 Texture *Renderer::createTexture(const Graphics::Surface *surface) {
@@ -130,6 +133,10 @@ void Renderer::init() {
 	glEnable(GL_DEPTH_TEST);
 }
 
+void Renderer::initFont(const Graphics::Surface *surface) {
+	_font = createTexture(surface);
+}
+
 void Renderer::clear() {
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 	glColor3f(1.0f, 1.0f, 1.0f);
@@ -223,6 +230,69 @@ void Renderer::drawTexturedRect2D(const Common::Rect &screenRect, const Common::
 	glDepthMask(GL_TRUE);
 }
 
+Common::Rect Renderer::getFontCharacterRect(uint8 character) {
+	uint index = 0;
+
+	if (character == ' ')
+		index = 0;
+	else if (character >= '0' && character <= '9')
+		index = 1 + character - '0';
+	else if (character >= 'A' && character <= 'Z')
+		index = 1 + 10 + character - 'A';
+	else if (character == '|')
+		index = 1 + 10 + 26;
+
+	return Common::Rect(16 * index, 0, 16 * (index + 1), 32);
+}
+
+void Renderer::draw2DText(const Common::String &text, const Common::Point &position) {
+	OpenGLTexture *glFont = static_cast<OpenGLTexture *>(_font);
+
+	// The font only has uppercase letters
+	Common::String textToDraw = text;
+	textToDraw.toUppercase();
+
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	glEnable(GL_TEXTURE_2D);
+	glDepthMask(GL_FALSE);
+
+	glColor3f(1.0f, 1.0f, 1.0f);
+	glBindTexture(GL_TEXTURE_2D, glFont->id);
+
+	int x = position.x;
+	int y = position.y;
+
+	for (uint i = 0; i < textToDraw.size(); i++) {
+		Common::Rect textureRect = getFontCharacterRect(textToDraw[i]);
+		int w = textureRect.width();
+		int h = textureRect.height();
+
+		float cw = textureRect.width() / (float) glFont->internalWidth;
+		float ch = textureRect.height() / (float) glFont->internalHeight;
+		float cx = textureRect.left / (float) glFont->internalWidth;
+		float cy = textureRect.top / (float) glFont->internalHeight;
+
+		glBegin(GL_QUADS);
+		glTexCoord2f(cx, cy + ch);
+		glVertex3f(x, y, 1.0f);
+		glTexCoord2f(cx + cw, cy + ch);
+		glVertex3f(x + w, y, 1.0f);
+		glTexCoord2f(cx + cw, cy);
+		glVertex3f(x + w, y + h, 1.0f);
+		glTexCoord2f(cx, cy);
+		glVertex3f(x, y + h, 1.0f);
+		glEnd();
+
+		x += textureRect.width();
+	}
+
+	glDisable(GL_TEXTURE_2D);
+	glDisable(GL_BLEND);
+	glDepthMask(GL_TRUE);
+}
+
 void Renderer::drawCube(Texture **textures) {
 	OpenGLTexture *texture0 = static_cast<OpenGLTexture *>(textures[0]);
 

engines/myst3/gfx.h

@@ -23,6 +23,7 @@
 #ifndef GFX_H_
 #define GFX_H_
 
+#include "common/rect.h"
 #include "common/system.h"
 #include "math/vector3d.h"
 
@@ -52,6 +53,8 @@ public:
 	virtual ~Renderer();
 
 	void init();
+	void initFont(const Graphics::Surface *surface);
+
 	void clear();
 	void setupCameraOrtho2D();
 	void setupCameraPerspective(float pitch, float heading);
@@ -65,12 +68,16 @@ public:
 			const Math::Vector3d &topRight, const Math::Vector3d &bottomRight, Texture *texture);
 
 	void drawCube(Texture **textures);
+	void draw2DText(const Common::String &text, const Common::Point &position);
 
 	static const int kOriginalWidth = 640;
 	static const int kOriginalHeight = 480;
 
 protected:
 	OSystem *_system;
+	Texture *_font;
+
+	Common::Rect Renderer::getFontCharacterRect(uint8 character);
 };
 
 } // end of namespace Myst3

engines/myst3/myst3.cpp

@@ -127,6 +127,12 @@ Common::Error Myst3Engine::run() {
 
 	_gfx->init();
 
+	// Init the font
+	Graphics::Surface *font = loadTexture(1206);
+	_gfx->initFont(font);
+	font->free();
+	delete font;
+
 	// Var init script
 	runScriptsFromNode(1000, 101);