Reshuffle lots of things

Basic environment mapping stuff
Remove OBJ file stuff


git-svn-id: svn://cook.msm.cam.ac.uk:745/thrust3d/thrust3d@19 84d2e878-0bd5-11dd-ad15-13eda11d74c5

1 files changed, 117 insertions, 53 deletions

diff --git a/src/render.c b/src/render.c
index 23fde64..b765e63 100644
--- a/src/render.c
+++ b/src/render.c
@@ -79,19 +79,17 @@ static void render_delete_shaders(RenderContext *ctx) {
 }
 
 /* OpenGL initial setup */
-RenderContext *render_setup(width, height) {
+RenderContext *render_setup(int width, int height) {
 	
 	RenderContext *ctx;
 	
 	ctx = malloc(sizeof(RenderContext));
 	if ( ctx == NULL ) return NULL;
 	
-	glClearColor(0.0, 0.0, 0.0, 1.0);
-	glViewport(0, 0, width, height);
+	ctx->width = width;
+	ctx->height = height;
 	
-	glMatrixMode(GL_PROJECTION);
-	glLoadIdentity();
-	gluPerspective(50.0, (GLfloat)width/(GLfloat)height, 0.1, 100.0);	/* Depth buffer 10cm to 100m */
+	glClearColor(0.0, 0.0, 0.0, 1.0);
 	
 	glEnable(GL_COLOR_MATERIAL);
 	glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
@@ -104,18 +102,28 @@ RenderContext *render_setup(width, height) {
 	glEnable(GL_BLEND);
 	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	
-	glEnableClientState(GL_VERTEX_ARRAY);
-	glEnableClientState(GL_NORMAL_ARRAY);
-	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+	/* Create a small FBO for rendering reflections with */
+	glGenFramebuffersEXT(1, &ctx->fbo);
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, ctx->fbo);
+ 	/* Add a (texture) colour buffer to the FBO */
+	glGenTextures(1, &ctx->fbotex);
+	glBindTexture(GL_TEXTURE_2D, ctx->fbotex);
+	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, GL_RGBA8, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, ctx->fbotex, 0);
+	/* Add a depth buffer to the FBO */
+	glGenRenderbuffersEXT(1, &ctx->fbodepth);
+	glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, ctx->fbodepth);
+	glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_STENCIL_EXT, 256, 256);
+	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, ctx->fbodepth);
+	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, ctx->fbodepth);
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
 	
 	render_load_shaders(ctx);
 	
 	ctx->num_textures = 0;
 	
-	ctx->frames = 0;
-	ctx->t_fps = SDL_GetTicks();
-	ctx->fps = 0;
-		
 	return ctx;
 	
 }
@@ -206,38 +214,15 @@ static void render_draw_line(GLfloat x1, GLfloat y1, GLfloat z1, GLfloat x2, GLf
 
 }
 
-void render_draw(Game *game) {
-
-	int i;
-	Uint32 t;
-	
-	t = SDL_GetTicks();
+static void render_draw_stuff(Game *game, Uint32 t) {
 	
-	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-	
-	glMatrixMode(GL_MODELVIEW);
-	glLoadIdentity();
-	gluLookAt(game->lander->x-(game->view_dist*sinf(game->lander->yaw)*cosf(game->view_angle)),
-		  game->lander->y-(game->view_dist*cosf(game->lander->yaw)*cosf(game->view_angle)),
-		  game->lander->z+(game->view_dist*sinf(game->view_angle)),
-		  game->lander->x, game->lander->y, game->lander->z,
-		  sqrtf(2.0)*sinf(game->lander->yaw)*sinf(game->view_angle),
-		  sqrtf(2.0)*cosf(game->lander->yaw)*sinf(game->view_angle), sqrtf(2.0)*cosf(game->view_angle));
+	int i;
 	
-	GLfloat pos[] = {-1.0, -0.8, 1.3, 0.0};
-	GLfloat ambient[4];
-	GLfloat diffuse[] = {0.8, 0.8, 0.8, 1.0};
-	GLfloat specular[] = {0.8, 0.8, 0.8, 1.0};
-	ambient[0] = 0.3;  ambient[1] = 0.3;  ambient[2] = 0.3;  ambient[3] = 1.0;
-	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
-	glLightfv(GL_LIGHT0, GL_POSITION, pos);
-	glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
-	glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
-	glEnable(GL_LIGHT0);
+	glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
+	glEnableClientState(GL_VERTEX_ARRAY);
+	glEnableClientState(GL_NORMAL_ARRAY);
+	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 	
-	/* Draw the objects */
-	//glUniform1iARB(glGetUniformLocationARB(game->render->lighting_program, "texture"), 0);
-	//glUseProgramObjectARB(game->render->lighting_program);
 	for ( i=0; i<game->num_rooms; i++ ) {
 	
 		Room *room;
@@ -261,21 +246,100 @@ void render_draw(Game *game) {
 		}
 		
 	}
-	/* Finally, the lander */
+	
+	glPopClientAttrib();
+	
+}
+
+static void render_setup_lighting(Game *game) {
+
+	GLfloat pos[] = {-1.0, -0.8, 1.3, 0.0};
+	GLfloat ambient[4];
+	GLfloat diffuse[] = {0.8, 0.8, 0.8, 1.0};
+	GLfloat specular[] = {0.8, 0.8, 0.8, 1.0};
+
+	glEnable(GL_LIGHTING);
+
+	ambient[0] = 0.3;  ambient[1] = 0.3;  ambient[2] = 0.3;  ambient[3] = 1.0;
+	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
+	glLightfv(GL_LIGHT0, GL_POSITION, pos);
+	glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
+	glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
+	glEnable(GL_LIGHT0);
+	
+}
+
+void render_draw(Game *game, Uint32 t) {
+
+	/* First pass: Looking upwards */
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, game->render->fbo);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glViewport(0, 0, 256, 256);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	gluPerspective(70.0, 1.0, 0.1, 100.0);
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+	gluLookAt(game->lander->x, game->lander->y, game->lander->z,
+		  game->lander->x, game->lander->y, game->lander->z+10.0,
+		  sqrtf(2.0)*sinf(game->lander->yaw), sqrtf(2.0)*cosf(game->lander->yaw), 0.0);
+	render_setup_lighting(game);
+	render_draw_stuff(game, t);
+	
+	/* Second pass: Main view */
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glViewport(0, 0, game->render->width, game->render->height);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	gluPerspective(50.0, (GLfloat)game->render->width/(GLfloat)game->render->height, 0.1, 100.0);	/* Depth buffer 10cm to 100m */
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+	gluLookAt(game->lander->x-(game->view_dist*sinf(game->lander->yaw)*cosf(game->view_angle)),
+		  game->lander->y-(game->view_dist*cosf(game->lander->yaw)*cosf(game->view_angle)),
+		  game->lander->z+(game->view_dist*sinf(game->view_angle)),
+		  game->lander->x, game->lander->y, game->lander->z,
+		  sqrtf(2.0)*sinf(game->lander->yaw)*sinf(game->view_angle),
+		  sqrtf(2.0)*cosf(game->lander->yaw)*sinf(game->view_angle), sqrtf(2.0)*cosf(game->view_angle));	
+	render_setup_lighting(game);
+	render_draw_stuff(game, t);
+	
+	/* Finally, draw the lander */
+	glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
+	glEnableClientState(GL_VERTEX_ARRAY);
+	glEnableClientState(GL_NORMAL_ARRAY);
+	glEnable(GL_TEXTURE_GEN_S);
+	glEnable(GL_TEXTURE_GEN_T);
+	glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
+	glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 	render_model_instance_draw(game->lander, t, game->render);
+	glPopClientAttrib();
 	render_draw_line(game->lander->x, game->lander->y, game->lander->z, game->lander->x, game->lander->y, game->lander->z-200.0);
-	//glUseProgramObjectARB(0);
+	glDisable(GL_TEXTURE_GEN_S);
+	glDisable(GL_TEXTURE_GEN_T);
 	
-	SDL_GL_SwapBuffers();
+	glClear(GL_DEPTH_BUFFER_BIT);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+	glBindTexture(GL_TEXTURE_2D, game->render->fbotex);
+	glEnable(GL_TEXTURE_2D);
+	glDisable(GL_LIGHTING);
+	glColor3f(1.0, 1.0, 1.0);
+	glBegin(GL_QUADS);
+		glTexCoord2f(0.0, 0.0);
+		glVertex2f(-1.0, -1.0);
+		glTexCoord2f(1.0, 0.0);
+		glVertex2f(-0.5, -1.0);
+		glTexCoord2f(1.0, 1.0);
+		glVertex2f(-0.5, -0.5);
+		glTexCoord2f(0.0, 1.0);
+		glVertex2f(-1.0, -0.5);
+	glEnd();
+	glDisable(GL_TEXTURE_2D);
 	
-	/* Calculate FPS every half a second */
-	game->render->frames++;
-	if ( t - game->render->t_fps > 500 ) {
-		game->render->fps = (500*game->render->frames) / (t - game->render->t_fps);
-		game->render->t_fps = t;
-		game->render->frames = 0;
-		game->frame_delay_fiddled = 0;
-	}
+	SDL_GL_SwapBuffers();
 	
 }