/**
 * Powder Toy - graphics (header)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef GRAPHICS_H
#define GRAPHICS_H
#include <SDL/SDL.h>
#include "defines.h"

#ifdef PIX16
#define PIXELSIZE 2
#define PIXPACK(x) ((((x)>>8)&0xF800)|(((x)>>5)&0x07E0)|(((x)>>3)&0x001F))
#define PIXRGB(r,g,b) ((((r)<<8)&0xF800)|(((g)<<3)&0x07E0)|(((b)>>3)&0x001F))
#define PIXR(x) (((x)>>8)&0xF8)
#define PIXG(x) (((x)>>3)&0xFC)
#define PIXB(x) (((x)<<3)&0xF8)
#else
#define PIXELSIZE 4
#ifdef PIX32BGR
#define PIXPACK(x) ((((x)>>16)&0x0000FF)|((x)&0x00FF00)|(((x)<<16)&0xFF0000))
#define PIXRGB(r,g,b) (((b)<<16)|((g)<<8)|((r)))// (((b)<<16)|((g)<<8)|(r))
#define PIXR(x) ((x)&0xFF)
#define PIXG(x) (((x)>>8)&0xFF)
#define PIXB(x) ((x)>>16)
#else
#ifdef PIX32BGRA
#define PIXPACK(x) ((((x)>>8)&0x0000FF00)|(((x)<<8)&0x00FF0000)|(((x)<<24)&0xFF000000))
#define PIXRGB(r,g,b) (((b)<<24)|((g)<<16)|((r)<<8))
#define PIXR(x) (((x)>>8)&0xFF)
#define PIXG(x) (((x)>>16)&0xFF)
#define PIXB(x) (((x)>>24))
#elif defined(PIX32OGL)
#define PIXPACK(x) (0xFF000000|((x)&0xFFFFFF))
#define PIXRGB(r,g,b) (0xFF000000|((r)<<16)|((g)<<8)|((b)))// (((b)<<16)|((g)<<8)|(r))
#define PIXRGBA(r,g,b,a) (((a)<<24)|((r)<<16)|((g)<<8)|((b)))// (((b)<<16)|((g)<<8)|(r))
#define PIXA(x) (((x)>>24)&0xFF)
#define PIXR(x) (((x)>>16)&0xFF)
#define PIXG(x) (((x)>>8)&0xFF)
#define PIXB(x) ((x)&0xFF)
#else
#define PIXPACK(x) (x)
#define PIXRGB(r,g,b) (((r)<<16)|((g)<<8)|(b))
#define PIXR(x) ((x)>>16)
#define PIXG(x) (((x)>>8)&0xFF)
#define PIXB(x) ((x)&0xFF)
#endif
#endif
#endif

extern int emp_decor;

extern unsigned int *render_modes;
extern unsigned int render_mode;
extern unsigned int colour_mode;
extern unsigned int *display_modes;
extern unsigned int display_mode;

extern SDL_Surface *sdl_scrn;
extern int sdl_scale;

extern int sandcolour_r;
extern int sandcolour_g;
extern int sandcolour_b;
extern int sandcolour_frame;

extern unsigned char fire_r[YRES/CELL][XRES/CELL];
extern unsigned char fire_g[YRES/CELL][XRES/CELL];
extern unsigned char fire_b[YRES/CELL][XRES/CELL];

extern unsigned int fire_alpha[CELL*3][CELL*3];
extern pixel *pers_bg;

extern char * flm_data;
extern int flm_data_points;
extern pixel flm_data_colours[];
extern float flm_data_pos[];

extern char * plasma_data;
extern int plasma_data_points;
extern pixel plasma_data_colours[];
extern float plasma_data_pos[];

struct gcache_item
{
	int isready;
	int pixel_mode;
	int cola, colr, colg, colb;
	int firea, firer, fireg, fireb;
};
typedef struct gcache_item gcache_item;

gcache_item *graphicscache;

void prepare_graphicscache();

char * generate_gradient(pixel * colours, float * points, int pointcount, int size);

void draw_other(pixel *vid);

void draw_rgba_image(pixel *vid, unsigned char *data, int x, int y, float a);

void *ptif_pack(pixel *src, int w, int h, int *result_size);

pixel *ptif_unpack(void *datain, int size, int *w, int *h);

pixel *resample_img_nn(pixel *src, int sw, int sh, int rw, int rh);

pixel *resample_img(pixel *src, int sw, int sh, int rw, int rh);

pixel *rescale_img(pixel *src, int sw, int sh, int *qw, int *qh, int f);

void render_gravlensing(pixel *src, pixel * dst);

void sdl_blit_1(int x, int y, int w, int h, pixel *src, int pitch);

void sdl_blit_2(int x, int y, int w, int h, pixel *src, int pitch);

void sdl_blit(int x, int y, int w, int h, pixel *src, int pitch);

void drawblob(pixel *vid, int x, int y, unsigned char cr, unsigned char cg, unsigned char cb);

void draw_tool(pixel *vid_buf, int b, int sl, int sr, unsigned pc, unsigned iswall);

int draw_tool_xy(pixel *vid_buf, int x, int y, int b, unsigned pc);

void draw_menu(pixel *vid_buf, int i, int hover);

void drawpixel(pixel *vid, int x, int y, int r, int g, int b, int a);

int addchar(pixel *vid, int x, int y, int c, int r, int g, int b, int a);

int drawchar(pixel *vid, int x, int y, int c, int r, int g, int b, int a);

int drawtext(pixel *vid, int x, int y, const char *s, int r, int g, int b, int a);

int drawtext_outline(pixel *vid, int x, int y, const char *s, int r, int g, int b, int a, int or, int og, int ob, int oa);

int drawtextwrap(pixel *vid, int x, int y, int w, const char *s, int r, int g, int b, int a);

void drawrect(pixel *vid, int x, int y, int w, int h, int r, int g, int b, int a);

void fillrect(pixel *vid, int x, int y, int w, int h, int r, int g, int b, int a);

void clearrect(pixel *vid, int x, int y, int w, int h);

void drawdots(pixel *vid, int x, int y, int h, int r, int g, int b, int a);

int textwidth(char *s);

int drawtextmax(pixel *vid, int x, int y, int w, char *s, int r, int g, int b, int a);

int textnwidth(char *s, int n);

void textnpos(char *s, int n, int w, int *cx, int *cy);

int textwidthx(char *s, int w);

int textposxy(char *s, int width, int w, int h);

int textwrapheight(char *s, int width);

void blendpixel(pixel *vid, int x, int y, int r, int g, int b, int a);

void draw_icon(pixel *vid_buf, int x, int y, char ch, int flag);

void draw_air(pixel *vid);

void draw_grav_zones(pixel *vid);

void draw_grav(pixel *vid);

void draw_line(pixel *vid, int x1, int y1, int x2, int y2, int r, int g, int b, int a);

void addpixel(pixel *vid, int x, int y, int r, int g, int b, int a);

void xor_pixel(int x, int y, pixel *vid);

void xor_line(int x1, int y1, int x2, int y2, pixel *vid);

void xor_rect(pixel *vid, int x, int y, int w, int h);

void blend_line(pixel *vid, int x1, int y1, int x2, int y2, int r, int g, int b, int a);

void render_parts(pixel *vid);

#ifdef OGLR
void draw_parts_fbo();
#endif

void draw_parts(pixel *vid);

void draw_walls(pixel *vid);

void create_decorations(int x, int y, int rx, int ry, int r, int g, int b, int click, int tool);

void create_decoration(int x, int y, int r, int g, int b, int click, int tool);

void line_decorations(int x1, int y1, int x2, int y2, int rx, int ry, int r, int g, int b, int click, int tool);

void box_decorations(int x1, int y1, int x2, int y2, int r, int g, int b, int click, int tool);

void draw_color_menu(pixel *vid_buf, int i, int hover);

void draw_wavelengths(pixel *vid, int x, int y, int h, int wl);

void render_signs(pixel *vid_buf);

void render_fire(pixel *dst);

void prepare_alpha(int size, float intensity);

void draw_image(pixel *vid, pixel *img, int x, int y, int w, int h, int a);

void dim_copy(pixel *dst, pixel *src);

void dim_copy_pers(pixel *dst, pixel *src);

void render_zoom(pixel *img);

int render_thumb(void *thumb, int size, int bzip2, pixel *vid_buf, int px, int py, int scl);

void render_cursor(pixel *vid, int x, int y, int t, int rx, int ry);

int sdl_open(void);

int draw_debug_info(pixel* vid, int lm, int lx, int ly, int cx, int cy, int line_x, int line_y);

void init_display_modes();
void update_display_modes();

#ifdef OGLR
void clearScreen(float alpha);
void ogl_blit(int x, int y, int w, int h, pixel *src, int pitch, int scale);
#endif

#endif

#ifdef INCLUDE_SHADERS
#ifndef SHADERS_H
#define SHADERS_H
const char * fireFragment = "#version 120\n\
uniform sampler2D fireAlpha;\
void main () {\
    vec4 texColor = texture2D(fireAlpha, gl_PointCoord);\
    gl_FragColor = vec4(gl_Color.rgb, texColor.a*gl_Color.a);\
}";
const char * fireVertex = "#version 120\n\
void main(void)\
{\
   gl_Position = ftransform();;\
   gl_FrontColor = gl_Color;\
}";
const char * lensFragment = "#version 120\n\
uniform sampler2D pTex;\
uniform sampler2D tfX;\
uniform sampler2D tfY;\
uniform float xres;\
uniform float yres;\
void main () {\
	vec4 transformX = texture2D(tfX, vec2(gl_TexCoord[0].s, gl_TexCoord[0].t));\
	vec4 transformY = texture2D(tfY, vec2(gl_TexCoord[0].s, gl_TexCoord[0].t));\
	transformX.r /= xres/4.0;\
	transformY.g /= yres/4.0;\
    vec4 texColor1 = vec4(\
    	texture2D(pTex, gl_TexCoord[0].st-vec2(transformX.r*0.90, transformY.g*0.90)).r,\
    	texture2D(pTex, gl_TexCoord[0].st-vec2(transformX.r*0.80, transformY.g*0.80)).g,\
    	texture2D(pTex, gl_TexCoord[0].st-vec2(transformX.r*0.70, transformY.g*0.70)).b,\
    	1.0\
    );\
	vec4 texColor2 = vec4(\
		texture2D(pTex, gl_TexCoord[0].st-vec2(transformX.r*0.95, transformY.g*0.95)).r,\
		texture2D(pTex, gl_TexCoord[0].st-vec2(transformX.r*0.85, transformY.g*0.85)).g,\
		texture2D(pTex, gl_TexCoord[0].st-vec2(transformX.r*0.75, transformY.g*0.75)).b,\
		1.0\
	);\
	vec4 texColor3 = vec4(\
		texture2D(pTex, gl_TexCoord[0].st-vec2(transformX.r*0.85, transformY.g*0.85)).r,\
		texture2D(pTex, gl_TexCoord[0].st-vec2(transformX.r*0.75, transformY.g*0.75)).g,\
		texture2D(pTex, gl_TexCoord[0].st-vec2(transformX.r*0.65, transformY.g*0.65)).b,\
		1.0\
	);\
	vec4 texColor = texColor1*0.6 + texColor2*0.2 + texColor3*0.2;\
    gl_FragColor = texColor;\
}";
const char * lensVertex = "#version 120\n\
void main(void)\
{\
	gl_TexCoord[0]  = gl_MultiTexCoord0;\
	gl_Position = ftransform();;\
	gl_FrontColor = gl_Color;\
}";
const char * airVFragment = "#version 120\n\
uniform sampler2D airX;\
uniform sampler2D airY;\
uniform sampler2D airP;\
void main () {\
	vec4 texX = texture2D(airX, gl_TexCoord[0].st);\
	vec4 texY = texture2D(airY, gl_TexCoord[0].st);\
	vec4 texP = texture2D(airP, gl_TexCoord[0].st);\
	gl_FragColor = vec4(abs(texX.r)/2.0, texP.b/2.0, abs(texY.g)/2.0, 1.0);\
}";
const char * airVVertex = "#version 120\n\
void main(void)\
{\
	gl_TexCoord[0]  = gl_MultiTexCoord0;\
	gl_Position = ftransform();;\
	gl_FrontColor = gl_Color;\
}";
const char * airPFragment = "#version 120\n\
uniform sampler2D airX;\
uniform sampler2D airY;\
uniform sampler2D airP;\
void main () {\
	vec4 texP = texture2D(airP, gl_TexCoord[0].st);\
    gl_FragColor = vec4(max(texP.b/2.0, 0), 0, abs(min(texP.b/2.0, 0)), 1.0);\
}";
const char * airPVertex = "#version 120\n\
void main(void)\
{\
	gl_TexCoord[0]  = gl_MultiTexCoord0;\
	gl_Position = ftransform();;\
	gl_FrontColor = gl_Color;\
}";
const char * airCFragment = "#version 120\n\
uniform sampler2D airX;\
uniform sampler2D airY;\
uniform sampler2D airP;\
void main () {\
	vec4 texX = texture2D(airX, gl_TexCoord[0].st);\
	vec4 texY = texture2D(airY, gl_TexCoord[0].st);\
	vec4 texP = texture2D(airP, gl_TexCoord[0].st);\
    gl_FragColor = vec4(max(texP.b/2.0, 0), 0, abs(min(texP.b/2.0, 0)), 1.0) + vec4(abs(texX.r)/8.0, abs(texX.r)/8.0, abs(texX.r)/8.0, 1.0) + vec4(abs(texY.g)/8.0, abs(texY.g)/8.0, abs(texY.g)/8.0, 1.0);\
}";
const char * airCVertex = "#version 120\n\
void main(void)\
{\
	gl_TexCoord[0]  = gl_MultiTexCoord0;\
	gl_Position = ftransform();;\
	gl_FrontColor = gl_Color;\
}";
#endif
#endif