gui.cpp

小型的3D游戏引擎

#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>
#include "../global.h"
#include "gui.h"

////////////////////////////////////////////////////////////////////////////

GcGui::GcGui()
{
	// Build the font for text output

}

////////////////////////////////////////////////////////////////////////////

GcGui::~GcGui()
{
	// Destruct the GUI
}

////////////////////////////////////////////////////////////////////////////

void GcGui::Begin()
{
	/* Make the scene ready for 2D rendering */

	// Disable depth testing
	glDisable(GL_DEPTH_TEST);

	glEnable(GL_TEXTURE_2D);

	// Select the projection matrix
	glMatrixMode(GL_PROJECTION);

	// Save the current matrix
	glPushMatrix();

		// Load a default matrix
		glLoadIdentity();

		// Change mode to 2D drawing
		glOrtho(0, GcSettings::ScreenWidth(), 0, GcSettings::ScreenHeight(), -1, 1);

		// Load the modelview matrix
		glMatrixMode(GL_MODELVIEW);

		// Save the old modelview matrix
		glPushMatrix();
			
			// Load the default modelview matrix
			glLoadIdentity();

	// The Pop matrix commands will come in End() and will restore the old matrixs
}

////////////////////////////////////////////////////////////////////////////

void GcGui::End()
{
	/* Restore the scene for 3D rendering */

		// Restor the old modelview matrix
		glPopMatrix();

		// Select the  projection matrix
		glMatrixMode(GL_PROJECTION);

	// Restore the old projection matrix
	glPopMatrix();

	// Cange back to the modelview matrix
	glMatrixMode(GL_MODELVIEW);

	// Enable depth testing
	glEnable(GL_DEPTH_TEST);

	glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
}

////////////////////////////////////////////////////////////////////////////

bool GcGui::Load(GcTexture *land, uint mapWidth)
{
	// Build the font for printing
	if(!font.Build("data/font.tga", 16, 16, 32, 32, 32))
	{
		MessageBox(NULL, "Unable to build the font.", "ERROR", MB_OK);
		return false;
	}

	// Load the sprite for the crosshair
	if(!aim.Load("data/aim.tga", 128, 128))
	{
		MessageBox(NULL, "Unable to load the crosshair.", "ERROR", MB_OK);
		return false;
	}

	// Load the sprite for the HUD
	if(!hud.Load("data/hud.tga", 256, 256))
	{
		MessageBox(NULL, "Unable to load the HUD.", "ERROR", MB_OK);
		return false;
	}

	map.Load(land, mapWidth, GcSettings::Scale());
	
	return true;
}

////////////////////////////////////////////////////////////////////////////

void GcGui::Draw(float x, float y)
{
	map.Draw(x, y);
	
	/*
	// Draw the crosshair
	aim.Draw(GcSettings::ScreenWidth() / 2.0f, GcSettings::ScreenHeight() / 2.0f);

	glEnable(GL_BLEND);

	glBlendFunc(GL_ONE, GL_SRC_COLOR);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	
	glColor4f(1.0f, 1.0f, 1.0f, 0.6f);

	// Draw the HUD
	hud.Draw(140, 140);

	glDisable(GL_BLEND);

	font.Print("Destroy", 95, 200);
	font.Print("the Rockza base", 55, 174);
	font.Print("Rescue POVs", 75, 140);
	*/
}

////////////////////////////////////////////////////////////////////////////

void GcGui::Print(char *string, int x, int y)
{
	font.Print(string, x, y);
}

////////////////////////////////////////////////////////////////////////////