From 7c65bff1fbb2bef8a6dc0b0cc5fd5cd639a7973a Mon Sep 17 00:00:00 2001
From: Kyle K <kylek389@gmail.com>
Date: Mon, 17 Jan 2011 20:03:57 -0600
Subject: Initial commit
---
Makefile | 25 +++++++
mingw32 | 21 ++++++
sdl.c | 241 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 287 insertions(+)
create mode 100644 Makefile
create mode 100644 mingw32
create mode 100644 sdl.c
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..68fc418
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,25 @@
+PROG = sdl
+OBJS = $(PROG).o
+CC = gcc
+DBGFLAGS = -g -O0
+ifdef DEBUG
+ CFLAGS = $(DBGFLAGS) -Wall -std=c99
+else
+ CFLAGS = -Wall -std=c99 -O2 -march=native -mtune=native
+endif
+LDFLAGS = -lGLEW -lGL -lGLU -lm -lglut
+SDL_CFLAGS := $(shell sdl-config --cflags)
+SDL_LDFLAGS := $(shell sdl-config --libs)
+SDL_image_CFLAGS := $(shell pkg-config --cflags SDL_image)
+SDL_image_LDFLAGS := $(shell pkg-config --libs SDL_image)
+
+$(PROG): $(OBJS)
+ $(CC) $(LDFLAGS) $(SDL_LDFLAGS) $(SDL_image_LDFLAGS) $(OBJS) -o $(PROG)
+
+$(PROG).o: $(PROG).c
+ $(CC) -c $(CFLAGS) $(SDL_CFLAGS) $(SDL_image_CFLAGS) $(PROG).c
+
+.PHONY: clean
+
+clean:
+ rm -f *.o ./$(PROG)
diff --git a/mingw32 b/mingw32
new file mode 100644
index 0000000..ac8483e
--- /dev/null
+++ b/mingw32
@@ -0,0 +1,21 @@
+PROG = sdl
+OBJS = $(PROG).o
+CC = gcc
+DBGFLAGS = -g -O0
+ifdef DEBUG
+ CFLAGS = $(DBGFLAGS) -Wall -std=c99
+else
+ CFLAGS = -Wall -std=c99 -O2 -march=native -mtune=native
+endif
+LDFLAGS = -lglew32 -lopengl32 -lglu32 -lm -lfreeglut -lmingw32 -lsdlmain -lsdl -mwindows
+
+$(PROG): $(OBJS)
+ $(CC) -o $(PROG) $(OBJS) $(LDFLAGS)
+
+$(PROG).o: $(PROG).c
+ $(CC) -c $(CFLAGS) $(PROG).c
+
+.PHONY: clean
+
+clean:
+ rm -f *.o ./$(PROG).exe
diff --git a/sdl.c b/sdl.c
new file mode 100644
index 0000000..2b421b5
--- /dev/null
+++ b/sdl.c
@@ -0,0 +1,241 @@
+/* sdl.c
+ *
+ * @2011 Kamil Kaminski
+ *
+ * Skeleton for SDL
+ *
+ */
+
+#include <SDL/SDL.h>
+#include <SDL/SDL_image.h>
+#include <GL/glew.h>
+#include <GL/freeglut.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+/* function prototypes */
+static void resize(int, int);
+static void setup_opengl(void);
+static void keys(SDL_keysym *, unsigned int *);
+static void process_events(void);
+static void render(void);
+
+/* global */
+int program_running = 1;
+
+/* few arrays, they could make into the header at some point */
+GLfloat fNoLight[] = { 0.0f, 0.0f, 0.0f, 0.0f };
+GLfloat fLowLight[] = { 0.25f, 0.25f, 0.25f, 1.0f };
+GLfloat fBrightLight[] = { 1.0f, 1.0f, 1.0f, 1.0f };
+
+static void resize(int w, int h)
+{
+ printf("window: resizing to %dx%d\n", w, h);
+ GLfloat fAspect = (GLfloat) w / (GLfloat) h;
+ if (h == 0)
+ h = 1;
+ glViewport(0, 0, w, h);
+
+ /* reset coordinate system */
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+
+ /* produce the perspective projection */
+ /* void gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar) */
+ gluPerspective(40.0f, fAspect, 1.0, 40.0);
+
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+
+ /* this needs to be ran again, glut does it for you I suppose */
+ SDL_SetVideoMode(w, h, 32, SDL_OPENGL | SDL_RESIZABLE);
+}
+
+static void setup_opengl(void)
+{
+ /* light values and coordinates */
+ GLfloat whiteLight[] = { 0.05f, 0.05f, 0.05f, 1.0f };
+ GLfloat sourceLight[] = { 0.75f, 0.75f, 0.75f, 1.0f };
+ GLfloat lightPos[] = { -10.f, 5.0f, 5.0f, 1.0f };
+
+ /* setup fog */
+ glEnable(GL_FOG);
+ glFogfv(GL_FOG_COLOR, fLowLight); /* set fog color to match background */
+ glFogf(GL_FOG_START, 4.0f);
+ glFogf(GL_FOG_END, 20.0f);
+ glFogi(GL_FOG_MODE, GL_LINEAR); /* fog equation */
+
+ glEnable(GL_DEPTH_TEST); /* hidden surface removal */
+ glFrontFace(GL_CCW); /* counter clock-wise polygons face out */
+ glEnable(GL_CULL_FACE); /* do not calculate inside of a pyramid */
+
+ /* setup and enable light 0 */
+ /* ambient RGBA intensity of the entire scene */
+ glLightModelfv(GL_LIGHT_MODEL_AMBIENT, whiteLight);
+ glLightfv(GL_LIGHT0, GL_AMBIENT, sourceLight);
+ glLightfv(GL_LIGHT0, GL_DIFFUSE, fBrightLight);
+ glLightfv(GL_LIGHT0, GL_SPECULAR, fBrightLight);
+ glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
+
+ /* enable lighting */
+ glEnable(GL_LIGHTING);
+ glEnable(GL_LIGHT0);
+
+ /* enable color tracking */
+ glEnable(GL_COLOR_MATERIAL);
+
+ /* set Material properties to follow glColor values */
+ glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
+ glMaterialfv(GL_FRONT, GL_SPECULAR, fBrightLight);
+ glMateriali(GL_FRONT, GL_SHININESS, 128);
+
+ /* turn on anti aliasing for points, lines, and polygons */
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ glEnable(GL_BLEND);
+ glEnable(GL_POINT_SMOOTH);
+ glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
+ glEnable(GL_LINE_SMOOTH);
+ glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
+
+ /* gray background */
+ glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
+}
+
+static void keys(SDL_keysym *keysym, unsigned int *keys_held)
+{
+ switch (keysym->sym)
+ {
+ case SDLK_ESCAPE: program_running = 0; break;
+ default: break;
+ }
+}
+
+/* process SDL events */
+static void process_events(void)
+{
+ SDL_Event event;
+ unsigned static int keys_held[323];
+ SDLKey sym;
+
+ while (SDL_PollEvent(&event))
+ {
+ sym = event.key.keysym.sym;
+
+ switch (event.type)
+ {
+ case SDL_KEYUP:
+ {
+ /* reset the key to 0 */
+ keys_held[sym] = 0;
+ break;
+ }
+ case SDL_KEYDOWN:
+ {
+ keys_held[sym] = 1;
+ keys(&event.key.keysym, keys_held);
+ break;
+ }
+ case SDL_VIDEORESIZE: { resize(event.resize.w, event.resize.h); break; }
+ case SDL_QUIT: { program_running = 0; break; }
+ default: break;
+ }
+ }
+}
+
+static void render(void)
+{
+ /* clear the window with current clearing color */
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ /* save the matrix state and do the rotations */
+ glPushMatrix();
+
+ GLfloat fExtent = 20.0f;
+ GLfloat fStep = 0.5f;
+ GLfloat y = -0.4f;
+ GLfloat iLine;
+
+ glLineWidth(1.0f);
+ glBegin(GL_LINES);
+ for (iLine = -fExtent; iLine <= fExtent; iLine += fStep)
+ {
+ glVertex3f(iLine, y, fExtent);
+ glVertex3f(iLine, y, -fExtent);
+ glVertex3f(fExtent, y, iLine);
+ glVertex3f(-fExtent, y, iLine);
+ }
+ glEnd();
+
+ /* restore the matrix state */
+ glPopMatrix();
+
+ /* buffer swap */
+ SDL_GL_SwapBuffers();
+}
+
+int main(int argc, char **argv)
+{
+ SDL_Surface *screen;
+
+ if (SDL_Init(SDL_INIT_VIDEO) < 0 )
+ {
+ fprintf(stderr, "unable to init SDL: %s\n", SDL_GetError());
+ exit(-1);
+ }
+ atexit(SDL_Quit);
+ SDL_WM_SetCaption("SDL", NULL);
+
+ SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
+ SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
+ SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
+ SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
+ SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
+ SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+
+ if ((screen = SDL_SetVideoMode(640, 480, 32, SDL_OPENGL | SDL_RESIZABLE)) == NULL)
+ {
+ fprintf(stderr, "unable to set video mode: %s\n", SDL_GetError());
+ exit(-1);
+ }
+
+ SDL_EnableUNICODE(1);
+ /* SDL doesn't trigger off a ResizeEvent at startup, but as we need this
+ * for OpenGL, we do this ourselves */
+ SDL_Event resizeEvent;
+ resizeEvent.type = SDL_VIDEORESIZE;
+ resizeEvent.resize.w = 640;
+ resizeEvent.resize.h = 480;
+ SDL_PushEvent(&resizeEvent);
+
+ /* initalize glew */
+ GLenum glewerr = glewInit();
+ if (GLEW_OK != glewerr)
+ {
+ fprintf(stderr, "error: %s\n", glewGetErrorString(glewerr));
+ return -1;
+ }
+ else
+ fprintf(stdout, "status: using GLEW %s\n", glewGetString(GLEW_VERSION));
+
+ /* display OpenGL version */
+ GLint major;
+ GLint minor;
+ glGetIntegerv(GL_MAJOR_VERSION, &major);
+ glGetIntegerv(GL_MINOR_VERSION, &minor);
+ fprintf(stdout, "version: OpenGL %d.%d\n", major, minor);
+
+ setup_opengl();
+
+ while (program_running)
+ {
+ process_events();
+ render();
+ }
+
+ puts("bye!");
+
+ return 0;
+}
+
--
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