--- /dev/null
+#include "graphics.h"
+#include <cmath>
+#include <cassert>
+#include <iostream>
+
+
+#undef DEBUG
+//#define DEBUG
+
+std::list<SDL_Surface*> Graphics::allTextures = std::list<SDL_Surface*>();
+Screen * Graphics::screen = NULL;
+
+int Graphics::screenWidth = 0;
+int Graphics::screenHeight = 0;
+bool Graphics::initialised = false;
+
+using namespace std;
+
+Texture::Texture(const char * filename, bool newDrawCentred) : surface(NULL), texture(0), drawCentred(newDrawCentred)
+{
+ #ifdef DEBUG
+ printf("Texture::Texture - loading \"%s\".\n", filename);
+ #endif //DEBUG
+
+ surface = Graphics::LoadTextureBMP(filename);
+ if (surface == NULL)
+ {
+ fprintf(stderr, "Texture::Texture - Could not open texture from file \"%s\"! ABORT\n", filename);
+ exit(EXIT_FAILURE);
+ }
+
+ GLenum texture_format;
+ GLint nOfColours = surface->format->BytesPerPixel;
+ switch (nOfColours)
+ {
+ case 4: //contains alpha
+ texture_format = (surface->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
+ break;
+ case 3: //does not contain alpha
+ texture_format = (surface->format->Rmask == 0x000000FF) ? GL_RGB : GL_BGR;
+ break;
+ default:
+ fprintf(stderr,"Texture::Texture - Could not understand SDL_Surface format (%d colours)! ABORT\n", nOfColours);
+ exit(EXIT_FAILURE);
+ break;
+ }
+
+ glGenTextures(1, &texture);
+ glBindTexture(GL_TEXTURE_2D, texture);
+ glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
+ glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+ glTexImage2D(GL_TEXTURE_2D, 0, nOfColours, surface->w, surface->h,0, texture_format, GL_UNSIGNED_BYTE, surface->pixels);
+
+}
+
+Texture::~Texture()
+{
+ #ifdef DEBUG
+ printf("Texture::~Texture - %p has been deleted. glDeleteTexture and SDL_FreeSurface here.\n", (void*)(this));
+ #endif //DEBUG
+ glDeleteTextures(1, &texture);
+ //SDL_FreeSurface(surface);
+}
+
+void Texture::DrawColour(int x, int y, double angle, double scale, Colour colour)
+{
+ if (scale > surface->w || scale > surface->h)
+ {
+ Graphics::DrawPixel(x/scale,y/scale,colour);
+ }
+ else
+ {
+ glColor3f(colour.r,colour.g,colour.b);
+ Draw(x,y,angle,scale);
+ glColor3f(1,1,1);
+ }
+}
+
+void Texture::Draw(int x, int y, double angle , double scale )
+{
+ //Draws the CENTRE of the texture at x, y, rotated by angle
+
+ #ifdef DEBUG
+ printf(" Texture::Draw - Drawing %p at (%d, %d) ; angle %2f ; scale % 2f\n", (void*)(this), x, y, angle, scale);
+ #endif //DEBUG
+
+ //if (x/scale < 0 || x/scale > Graphics::ScreenWidth() || y/scale < 0 || y/scale > Graphics::ScreenHeight() )
+ // return;
+
+ glPushMatrix(); //NOT deprecated
+
+
+ glTranslatef(x/scale, y/scale,0);
+
+ if (scale > surface->w || scale > surface->h)
+ {
+ Graphics::DrawPixel(0,0, Colour(255,255,255));
+ }
+ else
+ {
+ glRotated(angle, 0, 0, 1);
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, texture);
+ glBegin(GL_QUADS);
+
+ //scale /= 2;
+ if (drawCentred)
+ {
+ glTexCoord2i(0,0); glVertex3f(-0.5f/scale*surface->w ,-0.5f/scale*surface->h,0); //bottom left
+ glTexCoord2i(1,0); glVertex3f(0.5f/scale*surface->w,-0.5f/scale*surface->h,0); //bottom right
+ glTexCoord2i(1,1); glVertex3f(0.5f/scale*surface->w,0.5f/scale*surface->h,0); //top right
+ glTexCoord2i(0,1); glVertex3f(-0.5f/scale*surface->w,0.5f/scale*surface->h,0); //top left
+ }
+ else
+ {
+ glTexCoord2i(0,0); glVertex3f(0 ,0,0); //bottom left
+ glTexCoord2i(1,0); glVertex3f(1.0f/scale*surface->w,0,0); //bottom right
+ glTexCoord2i(1,1); glVertex3f(1.0f/scale*surface->w,1.0f/scale*surface->h,0); //top right
+ glTexCoord2i(0,1); glVertex3f(0,1.0f/scale*surface->h,0); //top left
+ }
+
+ glEnd();
+ glDisable(GL_TEXTURE_2D);
+ }
+ glPopMatrix();
+
+}
+
+
+Font::Font(const char * filename, int newWidth, int newHeight) : Texture(filename), width(newWidth), height(newHeight)
+{
+
+}
+
+Font::~Font()
+{
+
+}
+
+void Font::DrawText(const char * string, int x, int y, double angle, double scale)
+{
+ #ifdef DEBUG
+ printf("Font::DrawText - drawing \"%s\"\n", string);
+ #endif //DEBUG
+ glPushMatrix(); //NOT deprecated
+ glTranslatef(x, y,0);
+ glRotated(angle, 0, 0, 1);
+
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, texture);
+
+
+ for (int ii=0; string[ii] != '\0'; ++ii)
+ {
+ if (string[ii] != ' ')
+ {
+ glPushMatrix();
+ glTranslatef(ii*(float)(width)/(float)(scale),0,0);
+
+ int index = (int)(string[ii]) - (int)('!');
+ if (index < 0 || index > (int)('~') - (int)('!'))
+ index = (int)('~') - (int)('!') + 1;
+
+ float start = (float)(((((float)(index))*((float)(width)))-3.0f)/((float)surface->w));
+ float end = (float)(((((float)(index+1))*((float)(width)))-4.0f)/((float)surface->w));
+ if (start < 0) {start = 0;} if (end > 1) {end = 1;}
+ glBegin(GL_QUADS);
+ glTexCoord2f(start,0); glVertex3f(-0.5f/scale*width ,-0.5f/scale*height,0); //bottom left
+ glTexCoord2f(end,0); glVertex3f(0.5f/scale*width,-0.5f/scale*height,0); //bottom right
+ glTexCoord2f(end,1); glVertex3f(0.5f/scale*width,0.5f/scale*height,0); //top right
+ glTexCoord2f(start,1); glVertex3f(-0.5f/scale*width,0.5f/scale*height,0); //top left
+ //printf("Index %d - Drawing %c - maps to %f->%f\n", index,string[ii],start,end);
+
+ glEnd();
+ glPopMatrix();
+ }
+ }
+
+
+ glDisable(GL_TEXTURE_2D);
+ glPopMatrix();
+
+}
+
+
+void Graphics::Initialise(const char * caption, int newWidth, int newHeight)
+{
+ if (Initialised())
+ {
+ std::cerr << "Graphics have already been initialised! Fatal Error\n";
+ exit(EXIT_FAILURE);
+ }
+ screenWidth = newWidth; screenHeight = newHeight;
+
+ if (SDL_Init(SDL_INIT_VIDEO) != 0)
+ {
+ std::cerr << "Couldn't init SDL!\n";
+ exit(EXIT_FAILURE);
+ }
+ // atexit(Graphics::Destroy); BREAKS THINGS
+
+ SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); //According to sulix does not matter. (much)
+
+
+
+
+ screen = SDL_SetVideoMode(screenWidth,screenHeight, 32, SDL_OPENGL);
+ if ( screen == NULL )
+ {
+ std::cerr << "Couldn't set " << screenWidth << "x" << screenHeight << "x32 video mode: " << SDL_GetError() << "\n";
+ exit(EXIT_FAILURE);
+ }
+
+ //COMES AFTER SETVIDEO MODE
+ glEnable(GL_TEXTURE_2D);
+ glClearColor(1,1,1,0); //Set clear colour (white) here
+ glViewport(0,0,screenWidth,screenHeight); //DOES matter
+ glClear(GL_COLOR_BUFFER_BIT);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(0,screenWidth,screenHeight,0,-1,1);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glDisable(GL_DEPTH_TEST);
+ SDL_WM_SetCaption( caption, NULL);
+
+ Graphics::initialised = true;
+
+}
+
+void Graphics::Destroy()
+{
+ list<SDL_Surface*>::iterator i(allTextures.begin());
+ while (i != allTextures.end())
+ {
+ SDL_FreeSurface((*i));
+ ++i;
+ }
+ SDL_Quit();
+}
+
+SDL_Surface * Graphics::LoadTextureBMP(const char * file)
+{
+ SDL_Surface * tmp = SDL_LoadBMP(file);
+ if (tmp == NULL)
+ return NULL;
+ //assert(tmp != NULL);
+
+
+ if (Graphics::screen != NULL)
+ {
+ SDL_Surface * tex = SDL_DisplayFormat(tmp);
+ SDL_FreeSurface(tmp);
+
+ allTextures.push_back(tex);
+ return tex;
+ }
+ return tmp;
+}
+
+void Graphics::SaveTextureBMP(SDL_Surface * tex, const char * file)
+{
+ SDL_SaveBMP(tex, file);
+}
+
+
+void Graphics::DrawTexture(SDL_Surface * tex, int destX, int destY, int srcX, int srcY, int w, int h)
+{
+ if (w < 0) {w = tex->w - srcX;}
+ if (h < 0) {h = tex->h - srcY;}
+ Graphics::DrawTexture(screen, tex, destX, destY, srcX, srcY, w, h);
+}
+
+void Graphics::DrawTexture(SDL_Surface * dest, SDL_Surface * tex, int destX, int destY, int srcX, int srcY, int width, int height)
+{
+ if ((destX < 0)||(destX >= dest->w)||(destY < 0)||(destY >= dest->h)
+ ||(srcX < 0)||(srcX >= tex->w)||(srcY < 0)||(srcY >= tex->h))
+ return;
+
+ assert(dest->format->BitsPerPixel == 32);
+ assert(tex->format->BitsPerPixel == 32);
+
+ if (SDL_MUSTLOCK(tex))
+ SDL_LockSurface(tex);
+
+ if (SDL_MUSTLOCK(dest))
+ SDL_LockSurface(dest);
+
+
+
+ Colour transparent = Graphics::GetPixel(tex, srcX, srcY);
+ //printf("transparent from %d %d\n", srcX, srcY);
+
+ for (int xOff = 0; xOff < width; xOff++)
+
+ {
+ for (int yOff = 0; yOff < height; yOff++)
+ {
+ Colour nextColour = Graphics::GetPixel(tex, srcX+xOff, srcY+yOff);
+ if (nextColour != transparent)
+ {
+ Graphics::DrawPixel(dest, destX + xOff, destY + yOff, nextColour);
+ }
+ }
+ }
+
+ if (SDL_MUSTLOCK(tex))
+ SDL_UnlockSurface(tex);
+
+ if (SDL_MUSTLOCK(dest))
+ SDL_UnlockSurface(dest);
+
+}
+
+void Graphics::ClearScreen()
+{
+ //SDL_FillRect(screen, NULL ,Graphics::MakeColour(0,0,0));
+ glClear(GL_COLOR_BUFFER_BIT);
+
+}
+
+void Graphics::UpdateScreen()
+{
+ SDL_GL_SwapBuffers();
+ //SDL_Flip(screen);
+}
+
+void Graphics::DrawPixel(int x, int y, Colour colour)
+{
+ DrawPixel(screen, x, y, colour);
+}
+
+void Graphics::DrawPixel(SDL_Surface * dest, int x, int y, Colour colour)
+{
+ glBegin(GL_POINTS);
+ glColor4f(colour.r/255, colour.g/255, colour.b/255, colour.a);
+ glVertex2f(x, y);
+ glColor3f(1,1,1);
+ glEnd();
+}
+
+void Graphics::DrawGrid(int gridWidth, int gridHeight, Colour colour)
+{
+ for (int x = 0; x < screen->w; x+=gridWidth)
+ {
+ Graphics::DrawLine(x,0, x,screen->h - 1, colour);
+ }
+ for (int y = 0; y < screen->h; y+=gridHeight)
+ {
+ Graphics::DrawLine(0,y, screen->w - 1,y, colour);
+ }
+}
+
+Uint8 Graphics::MakeColour(int R, int G, int B, int Alpha)
+{
+ return SDL_MapRGB(screen->format,R,G,B);
+}
+
+Colour Graphics::GetPixel(int x, int y)
+{
+ return Graphics::GetPixel(screen, x, y);
+}
+
+Colour Graphics::GetPixel(SDL_Surface * src, int x, int y)
+{
+ //Convert the pixels to 32 bit
+ Uint8 * pixels = (Uint8*)src->pixels;
+ //Get the requested pixel
+
+ if (((y > 0)&&(y < src->h)) && ((x > 0)&&(x < src->w)))
+ return ConvertColour(pixels[ ( y * src->w ) + x ]);
+ return Colour(0,0,0,0);
+
+}
+
+
+
+void Graphics::DrawLine(int x1, int y1, int x2, int y2, Colour colour,double scale)
+{
+ //printf("DRAW LINE\n");
+ glColor4f(colour.r/255,colour.g/255,colour.b/255,colour.a);
+ glBegin(GL_LINES);
+ glVertex2f(x1/scale, y1/scale); // origin of the line
+ glVertex2f(x2/scale, y2/scale); // ending point of the line
+ glColor3f(1,1,1);
+ glEnd();
+
+
+}
+
+void Graphics::DrawLineDashed(int x1, int y1, int x2, int y2, Colour colour, double scale)
+{
+ glLineStipple(8, 0xAAAA);
+ glEnable(GL_LINE_STIPPLE);
+ DrawLine(x1,y1,x2,y2,colour,scale);
+ glDisable(GL_LINE_STIPPLE);
+ glEnd();
+}
+
+void Graphics::DrawRectangle(int topX, int topY, int botX, int botY, Colour colour, double scale)
+{
+ glColor4f(colour.r/255,colour.g/255,colour.b/255,colour.a);
+ glBegin(GL_LINES);
+ glVertex2f(topX/scale, topY/scale); // origin of the rectangle
+ glVertex2f(botX/scale, topY/scale); // point1
+ glVertex2f(botX/scale, botY/scale); // point2
+ glVertex2f(topX/scale, botY/scale); // point3
+ glVertex2f(topX/scale, topY/scale); // point4
+ glEnd();
+}
+
+Colour Graphics::ConvertColour(Uint8 from)
+{
+ SDL_PixelFormat * fmt=screen->format;
+ Colour result;
+
+ Uint8 temp;
+
+ //Get red
+ temp=from&fmt->Rmask; /* Isolate red component */
+ temp=temp>>fmt->Rshift;/* Shift it down to 8-bit */
+ temp=temp<<fmt->Rloss; /* Expand to a full 8-bit number */
+ result.r = (float)(temp);
+
+ //Get green
+ temp=from&fmt->Gmask; /* Isolate red component */
+ temp=temp>>fmt->Gshift;/* Shift it down to 8-bit */
+ temp=temp<<fmt->Gloss; /* Expand to a full 8-bit number */
+ result.g = (float)(temp);
+
+ //Get blue
+ temp=from&fmt->Bmask; /* Isolate red component */
+ temp=temp>>fmt->Bshift;/* Shift it down to 8-bit */
+ temp=temp<<fmt->Bloss; /* Expand to a full 8-bit number */
+ result.b = (float)(temp);
+
+ //Get alpha
+ temp=from&fmt->Amask; /* Isolate red component */
+ temp=temp>>fmt->Ashift;/* Shift it down to 8-bit */
+ temp=temp<<fmt->Aloss; /* Expand to a full 8-bit number */
+ result.a = (float)(temp);
+ return result;
+}
+
+
+
+
+
+
git.ucc.asn.au / progcomp2012.git / blobdiff
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