mirror of
https://github.com/mapmapteam/mapmap.git
synced 2026-06-16 12:33:19 +02:00
Add a prototype using SDL
This commit is contained in:
Alexandre Quessy
@@ -17,6 +17,7 @@ libtool
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m4/
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po/Makefile
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po/Makefile.in
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prototypes/sdl/run
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src/config.h
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src/config.h.in
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src/mapmap
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@@ -0,0 +1,20 @@
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#!/bin/bash
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DEPS=sdl gl glu SDL_image
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CC=gcc
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CC_FLAGS=-O0 -g `pkg-config --cflags --libs $(DEPS)`
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EXEC=run
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SOURCES=$(wildcard *.c)
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OBJECTS=$(SOURCES:.c=.o)
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all: run
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$(EXEC): $(OBJECTS)
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$(CC) $(OBJECTS) $(CC_FLAGS) -o $(EXEC)
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%.o: %.c
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$(CC) -c $(CC_FLAGS) $< -o $@
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clean:
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rm -f $(EXEC) $(OBJECTS)
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@@ -0,0 +1 @@
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sudo yum install -y SDL_image-devel
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Binary file not shown.
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After Width: | Height: | Size: 13 KiB |
@@ -0,0 +1,370 @@
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#include "SDL.h"
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#include "SDL_opengl.h"
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#include "SDL_image.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#define WIDTH 640
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#define HEIGHT 480
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static const char * IMAGE_FILE = "example.png";
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GLfloat yaw;
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GLfloat pitch;
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int level;
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static void
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subdivide (GLfloat point0[3], GLfloat point1[3], GLfloat point2[3], int level)
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{
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int coord;
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GLfloat midpoint[3][3];
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/* Don't subdivide any further; just draw the triangle */
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if (level==0)
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{
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glColor3fv (point0);
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glVertex3fv (point0);
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glColor3fv (point1);
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glVertex3fv (point1);
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glColor3fv (point2);
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glVertex3fv (point2);
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return;
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}
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/* Calculate a midpoint on each edge of the triangle */
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for (coord = 0; coord<3; coord++)
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{
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midpoint[0][coord] = (point0[coord] + point1[coord])*0.5;
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midpoint[1][coord] = (point1[coord] + point2[coord])*0.5;
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midpoint[2][coord] = (point2[coord] + point0[coord])*0.5;
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}
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/* Subdivide each triangle into three more */ /* . */
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level--; /* /X\ */
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subdivide (point0,midpoint[0],midpoint[2],level); /* /xxx\ */
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subdivide (point1,midpoint[1],midpoint[0],level); /* /X\ /X\ */
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subdivide (point2,midpoint[2],midpoint[1],level); /* /XXXVXXX\ */
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}
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static void
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paint_triangles ()
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{
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int i;
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/* Coordinates of the 6 vertices of the octahedron */
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static GLfloat point[6][3] = {
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{1.0f,0.0f,0.0f},{-1.0f,0.0f,0.0f},
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{0.0f,1.0f,0.0f},{0.0f,-1.0f,0.0f},
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{0.0f,0.0f,1.0f},{0.0f,0.0f,-1.0f}
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};
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/* indices of the vertices of the triangles which make up each of
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* the 8 faces of the octahedron */
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static int triangle[8][3] = {
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{2,4,0},{2,0,5},{2,5,1},{2,1,4},{3,0,4},{3,5,0},{3,1,5},{3,4,1}
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};
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/* Rotate the object */
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glRotatef (pitch, 1.0f, 0.0f, 0.0f);
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glRotatef (yaw, 0.0f, 1.0f, 0.0f);
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/* Draw the triangles which make up the object */
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glBegin (GL_TRIANGLES);
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for (i=0; i<8; i++)
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{
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subdivide (point[triangle[i][0]],point[triangle[i][1]],point[triangle[i][2]],level);
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}
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glEnd ();
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/* increment the rotation every frame */
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yaw = yaw + 0.05;
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}
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static void
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paint_begin ()
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{
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/* Clear the color plane and the z-buffer */
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glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glLoadIdentity ();
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/* Move the object 2 units away from the camera */
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glTranslatef (0.0f, 0.0f, -2.0f);
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}
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static void
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paint_end ()
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{
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/* finally, swap the back and front buffers */
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SDL_GL_SwapBuffers ();
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}
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static void
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setup_sdl ()
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{
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const SDL_VideoInfo* video;
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int img_flags;
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int img_initted;
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if (SDL_Init (SDL_INIT_VIDEO) < 0 )
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{
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fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError ());
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exit (1);
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}
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/* Quit SDL properly on exit */
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atexit (SDL_Quit);
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/* Get the current video information */
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video = SDL_GetVideoInfo ( );
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if ( video == NULL )
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{
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fprintf (stderr, "Couldn't get video information: %s\n", SDL_GetError ());
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exit (1);
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}
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/* Set the minimum requirements for the OpenGL window */
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SDL_GL_SetAttribute ( SDL_GL_RED_SIZE, 5 );
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SDL_GL_SetAttribute ( SDL_GL_GREEN_SIZE, 5 );
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SDL_GL_SetAttribute ( SDL_GL_BLUE_SIZE, 5 );
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SDL_GL_SetAttribute ( SDL_GL_DEPTH_SIZE, 16 );
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SDL_GL_SetAttribute ( SDL_GL_DOUBLEBUFFER, 1 );
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/* Note the SDL_DOUBLEBUF flag is not required to enable double
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* buffering when setting an OpenGL video mode.
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* Double buffering is enabled or disabled using the
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* SDL_GL_DOUBLEBUFFER attribute.
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*/
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if ( SDL_SetVideoMode ( WIDTH, HEIGHT, video->vfmt->BitsPerPixel, SDL_OPENGL ) == 0 )
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{
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fprintf (stderr, "Couldn't set video mode: %s\n", SDL_GetError ());
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exit (1);
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}
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img_flags = IMG_INIT_JPG | IMG_INIT_PNG;
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img_initted = IMG_Init (img_flags);
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if (img_initted & img_flags != img_flags)
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{
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printf ("IMG_Init: Failed to init required jpg and png support!\n");
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printf ("IMG_Init: %s\n", IMG_GetError ());
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exit (1);
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}
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}
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static void
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setup_opengl ()
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{
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float aspect = (float)WIDTH / (float)HEIGHT;
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/* Make the viewport cover the whole window */
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glViewport (0, 0, WIDTH, HEIGHT);
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/* Set the camera projection matrix:
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* field of view: 90 degrees
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* near clipping plane at 0.1
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* far clipping plane at 100.0
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*/
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glMatrixMode (GL_PROJECTION);
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glLoadIdentity ();
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gluPerspective (60.0, aspect, 0.1, 100.0);
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/* We're done with the camera, now matrix operations
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* will affect the modelview matrix
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* */
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glMatrixMode (GL_MODELVIEW);
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/* set the clear color to gray */
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glClearColor (0.5, 0.5 ,0.5, 0);
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/* We want z-buffer tests enabled*/
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glEnable (GL_DEPTH_TEST);
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/* Do draw back-facing polygons*/
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glDisable (GL_CULL_FACE);
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}
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static void
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EnableTransparency ()
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{
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glEnable (GL_BLEND);
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glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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}
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static GLuint
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LoadTexture(const char *filename, int *textw, int *texth)
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{
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SDL_Surface *surface;
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GLuint textureid;
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int mode;
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surface = IMG_Load (filename);
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// Or if you don't use SDL_image you can use SDL_LoadBMP here instead:
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// surface = SDL_LoadBMP(filename);
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// could not load filename
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if (! surface)
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{
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return 0;
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}
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// work out what format to tell glTexImage2D to use...
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if (surface->format->BytesPerPixel == 3)
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{ // RGB 24bit
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mode = GL_RGB;
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}
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else if (surface->format->BytesPerPixel == 4)
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{ // RGBA 32bit
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mode = GL_RGBA;
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}
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else
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{
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SDL_FreeSurface (surface);
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return 0;
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}
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*textw = surface->w;
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*texth = surface->h;
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// create one texture name
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glGenTextures (1, &textureid);
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// tell opengl to use the generated texture name
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glBindTexture (GL_TEXTURE_2D, textureid);
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// this reads from the sdl surface and puts it into an opengl texture
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glTexImage2D (GL_TEXTURE_2D, 0, mode, surface->w, surface->h, 0, mode, GL_UNSIGNED_BYTE, surface->pixels);
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// these affect how this texture is drawn later on...
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// clean up
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SDL_FreeSurface (surface);
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printf ("Loaded image %s %dx%d\n", filename, *textw, *texth);
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return textureid;
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}
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static void
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DrawTexture(int x, int y, GLuint textureid, int textw, int texth)
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{
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// tell opengl to use the generated texture name
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glBindTexture (GL_TEXTURE_2D, textureid);
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glEnable (GL_TEXTURE_2D);
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// make a rectangle
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glBegin (GL_QUADS);
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// top left
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glTexCoord2i (0, 0);
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glVertex3f (x, y, 0);
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// top right
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glTexCoord2i (1, 0);
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glVertex3f (x + textw, y, 0);
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// bottom right
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glTexCoord2i (1, 1);
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glVertex3f (x + textw, y + texth, 0);
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// bottom left
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glTexCoord2i (0, 1);
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glVertex3f (x, y + texth, 0);
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glEnd ();
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glDisable (GL_TEXTURE_2D );
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}
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static void
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main_loop ()
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{
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SDL_Event event;
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GLuint texture;
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int textw, texth;
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printf ("Loading texture %s\n", IMAGE_FILE);
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texture = LoadTexture (IMAGE_FILE, &textw, &texth);
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while (1)
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{
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/* process pending events */
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while (SDL_PollEvent (&event))
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{
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switch (event.type)
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{
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case SDL_KEYDOWN:
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switch (event.key.keysym.sym)
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{
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case SDLK_ESCAPE:
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exit (0);
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break;
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case SDLK_KP_PLUS:
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level++;
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if (level > 5)
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level=5;
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break;
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case SDLK_KP_MINUS:
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level--;
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if (level < 0)
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level=0;
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break;
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default:
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//no default key processing
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// (stops compiler warnings for unhandled SDL keydefs
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break;
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}
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break;
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case SDL_MOUSEMOTION:
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pitch += event.motion.yrel;
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if (pitch < -70)
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pitch = -70;
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if (pitch > 70)
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pitch = 70;
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break;
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case SDL_QUIT:
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exit (0);
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break;
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}
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}
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/* update the screen */
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paint_begin ();
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paint_triangles ();
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glColor3f (1.0, 1.0, 1.0);
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DrawTexture (0, 0, texture, textw, texth);
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paint_end ();
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/* Wait 50ms to avoid using up all the CPU time */
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SDL_Delay (50);
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}
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}
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int
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main (int argc, char* argv[])
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{
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setup_sdl ();
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setup_opengl ();
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yaw = 45;
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pitch = 0;
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level = 2;
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main_loop ();
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return 0;
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}
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