libgender/material.C

#include <cstdlib>
#include <cstring>

#include <algorithm>

#include "opengl.h"
#include "material.h"
#include "view.h"
#include "util.h"

GLuint
texture::load_texture (SDL_Surface * surface, GLfloat * tex2oord, int flags)
{
  GLuint name;
  SDL_Surface *image;
  SDL_Rect area;
  Uint32 saved_flags;
  Uint8 saved_alpha;

  /* Use the surface width and height expanded to powers of 2 */
  tex2oord[0] = 0.F;    /* Min X */
  tex2oord[1] = 0.F;    /* Min Y */
  tex2oord[2] = 1.F;    /* Max X */
  tex2oord[3] = 1.F;    /* Max Y */

  image = SDL_CreateRGBSurface (SDL_SWSURFACE, surface->w, surface->h, 32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN     /* OpenGL RGBA masks */
                                0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
#else
                                0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
#endif
    );

  if (image == NULL)
    return 0;

  /* Save the alpha blending attributes */
  saved_flags = surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
  saved_alpha = surface->format->alpha;
  if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
    SDL_SetAlpha (surface, 0, 0);

  /* Copy the surface into the GL texture image */
  area.x = 0;
  area.y = 0;
  area.w = surface->w;
  area.h = surface->h;
  SDL_BlitSurface (surface, &area, image, &area);

  /* Restore the alpha blending attributes */
  if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
    SDL_SetAlpha (surface, saved_flags, saved_alpha);

  /* Create an OpenGL texture for the image */
  glGenTextures (1, &name);
  glBindTexture (GL_TEXTURE_2D, name);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, flags & DISABLE_MIPMAP ? GL_LINEAR : GL_LINEAR_MIPMAP_LINEAR);
  glTexParameteri (GL_TEXTURE_2D, GL_GENERATE_MIPMAP, flags & DISABLE_MIPMAP ? GL_FALSE : GL_TRUE);
  glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, surface->w, surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);

  if (flags & CLAMP)
    {
      glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
      glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
      glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
    }

  SDL_FreeSurface (image);      /* No longer needed */

  return name;
}

material::~material ()
{
}

void material::enable (view &ctx)
{
  pass_data::matmap_t &matmap = ctx.pass->matmap;

  pass_data::matmap_t::iterator i = matmap.find (this);

  if (i == matmap.end ())
    {
      string vsh_src, fsh_src;

      shader::shader_builder::start ();

      if (ctx.pass->l)
        ctx.pass->l->vsh ();

      vsh (ctx);

      // compute logarithmic depth - see the frustum matrix in view.C
      {
        using namespace shader::compile;

        temp_1f lz;
        
        // TODO: negative z is not calculated in an a very acceptable way
        lz = z (vout.position);
        lz = sign (lz) * (log (abs (lz) + exp (1e0)) - 1e0) / log (1e30);
        z (vout.position) = lz * w (vout.position);
      }

      vsh_src = shader::shader_builder::stop ();

      shader::shader_builder::start ();

      if (ctx.pass->l)
        {
          ctx.pass->l->fsh ();
          fsh (ctx);
        }
      else
        // many drivers need both vertex and fragment shader, 'caboom!' otherwise
        shader::compile::fout.frag_color = shader::compile::vec4 (0., 0., 0., 0.);

      fsh_src = shader::shader_builder::stop ();

      shader::program_object po = shader::get_program (vsh_src, fsh_src);
      matmap.insert (pass_data::matmap_t::value_type (this, po));

      po->enable ();
    }
  else
    i->second->enable ();

  if (ctx.pass->l)
    ctx.pass->l->enable (ctx);
}

void material::disable (view &ctx)
{
}

test_material::test_material ()
//: tex ("textures/osama.jpg"), texvar (tex.name)
: tex ("textures/rockwall.jpg"), texvar (tex.name)
, norm ("textures/rockwall_normal.jpg"), normvar (norm.name)
{
}

skybox_material::skybox_material ()
: tex (0)
{
}

void skybox_material::enable (view &ctx)
{
  material::enable (ctx);
}

void skybox_material::disable (view &ctx)
{
  material::disable (ctx);
}

static shader::varying_2f skybox_texcoord;

void skybox_material::vsh (view &ctx)
{
  using namespace shader::compile;

  std_vsh ();
  skybox_texcoord = xy (vin.tex_coord[0]);
}

void skybox_material::fsh (view &ctx)
{
  using namespace shader::compile;

  xyz (fout.frag_color) = xyz (texture_2d (tex, skybox_texcoord));
}

void mat_timed::enable (view &ctx)
{
  material::enable (ctx);

  time->set (timer::now);
  sh_colour->set (vec3 (255, 0, 0) * (1.F / 255.F));
}

void mat_timed::disable (view &ctx)
{
  material::disable (ctx);
}

void mat_timed::vsh (view &ctx)
{
  using namespace shader::compile;
  std_vsh ();

  if (ctx.pass->l)
    f_normal = normal_matrix * vin.normal;
}

void mat_timed::fsh (view &ctx)
{
  using namespace shader::compile;

  if (ctx.pass->l)
    {
      temp_1f fac;
      temp_3f normal;

      normal = f_normal + 0.3 * pow (sin (f_normal * 3.14159 + time), 3);

      fac = dot (normalize (normal), normalize (ctx.pass->l->sh_lightvec));

      xyz (fout.frag_color) = fac * shader::compile::vec3 (0.1,0.5,1);//ctx.pass->l->sh_colour * sh_colour * fac;
    }
}

void mat_gouraud_shaded::enable (view &ctx)
{
  material::enable (ctx);

  sh_colour->set (vec3 (c.r, c.g, c.b) * (1.F / 255.F));
}

void mat_gouraud_shaded::disable (view &ctx)
{
  material::disable (ctx);
}

void mat_gouraud_shaded::vsh (view &ctx)
{
  using namespace shader::compile;
  std_vsh ();

  if (ctx.pass->l)
    f_normal = normal_matrix * vin.normal;
}

void mat_gouraud_shaded::fsh (view &ctx)
{
  using namespace shader::compile;

  if (ctx.pass->l)
    {
      temp_1f fac;

      fac = dot (normalize (f_normal), normalize (ctx.pass->l->sh_lightvec));
      
      xyz (fout.frag_color) = ctx.pass->l->sh_colour * sh_colour * fac;
    }
}

static shader::varying_3f f_normal;

void mat_debug::enable (view &ctx)
{
  material::enable (ctx);

  glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glEnable (GL_BLEND);
  glDepthMask (1);
}

void mat_debug::disable (view &ctx)
{
  material::disable (ctx);

  glDisable (GL_BLEND);
  glDepthMask (0);
}

void mat_debug::vsh (view &ctx)
{
  using namespace shader::compile;
  std_vsh ();

  if (ctx.pass->l)
    f_normal = normal_matrix * vin.normal;
}

void mat_debug::fsh (view &ctx)
{
  using namespace shader::compile;

  if (ctx.pass->l)
    {
      temp_1f fac;

      fac = dot (normalize (f_normal), normalize (ctx.pass->l->sh_lightvec));
      
      xyz (fout.frag_color) = shader::compile::vec3 (1.,0.,0.);
      w (fout.frag_color) = 0.1;
    }
}

static shader::varying_2f texcoord;
static shader::varying_3f normal;

void test_material::vsh (view &ctx)
{
  using namespace shader::compile;

  std_vsh ();

  if (ctx.pass->l)
    {
      texcoord = xy (vin.tex_coord[0]);
      normal = normal_matrix * vin.normal;
    }
}

void test_material::fsh (view &ctx)
{
  using namespace shader::compile;

  if (ctx.pass->l)
    {
      temp_3f lc;
      temp_1f fac;

      temp_3f rot1, rot2, rot3;

      yxz (rot1) = (xyz (texture_2d (normvar, texcoord)) * 2.F - 1.F);

      //rot1 = normal_matrix * rot1;

      rot2 = shader::compile::vec3 (x(rot1), z(rot1), -y(rot1));
      rot3 = shader::compile::vec3 (y(rot1), -x(rot1), z(rot1));

      normal = mat3 (rot1, rot2, rot3) * normal;

      fac = dot (normalize (normal), normalize (ctx.pass->l->sh_lightvec));
      fac = max (pow (max (fac, 0.0), 6), 0.3);
      xyz (fout.frag_color) = xyz (texture_2d (texvar, texcoord) + 0.2F)
                              * fac
                              * ctx.pass->l->sh_colour;
      //xyz (fout.frag_color) = lc * fac;
    }
}

void test_material::enable (view &ctx)
{
  material::enable (ctx);
  texvar->enable ();
  normvar->enable ();
}

void test_material::disable (view &ctx)
{
  normvar->disable ();
  texvar->disable ();
  material::disable (ctx);
}

test_material *testmat;
mat_gouraud_shaded *testmat2;
mat_timed *testmat3;
mat_debug *debugmat;

Revision:	1.67
Committed:	Wed Jan 25 22:52:26 2006 UTC (18 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.66:	+4 -3 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.8	#include <cstdlib>
2			#include <cstring>
3
4	root	1.9	#include <algorithm>
5
6	root	1.13	#include "opengl.h"
7			#include "material.h"
8	root	1.18	#include "view.h"
9	root	1.13	#include "util.h"
10
11	root	1.6	GLuint
12	root	1.65	texture::load_texture (SDL_Surface * surface, GLfloat * tex2oord, int flags)
13	root	1.3	{
14	root	1.15	GLuint name;
15	root	1.3	SDL_Surface *image;
16			SDL_Rect area;
17			Uint32 saved_flags;
18			Uint8 saved_alpha;
19
20			/* Use the surface width and height expanded to powers of 2 */
21	root	1.19	tex2oord[0] = 0.F; /* Min X */
22			tex2oord[1] = 0.F; /* Min Y */
23			tex2oord[2] = 1.F; /* Max X */
24			tex2oord[3] = 1.F; /* Max Y */
25	root	1.3
26	root	1.19	image = SDL_CreateRGBSurface (SDL_SWSURFACE, surface->w, surface->h, 32,
27	root	1.3	#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
28			0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
29			#else
30			0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
31			#endif
32			);
33	root	1.6
34	root	1.3	if (image == NULL)
35	root	1.6	return 0;
36	root	1.3
37			/* Save the alpha blending attributes */
38			saved_flags = surface->flags & (SDL_SRCALPHA \| SDL_RLEACCELOK);
39			saved_alpha = surface->format->alpha;
40			if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
41	root	1.6	SDL_SetAlpha (surface, 0, 0);
42	root	1.3
43			/* Copy the surface into the GL texture image */
44			area.x = 0;
45			area.y = 0;
46			area.w = surface->w;
47			area.h = surface->h;
48			SDL_BlitSurface (surface, &area, image, &area);
49
50			/* Restore the alpha blending attributes */
51			if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
52	root	1.6	SDL_SetAlpha (surface, saved_flags, saved_alpha);
53	root	1.3
54			/* Create an OpenGL texture for the image */
55	root	1.15	glGenTextures (1, &name);
56			glBindTexture (GL_TEXTURE_2D, name);
57	root	1.6	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
58	root	1.65	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, flags & DISABLE_MIPMAP ? GL_LINEAR : GL_LINEAR_MIPMAP_LINEAR);
59			glTexParameteri (GL_TEXTURE_2D, GL_GENERATE_MIPMAP, flags & DISABLE_MIPMAP ? GL_FALSE : GL_TRUE);
60			glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, surface->w, surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
61
62			if (flags & CLAMP)
63			{
64			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
65			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
66			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
67			}
68
69	root	1.3	SDL_FreeSurface (image); /* No longer needed */
70
71	root	1.15	return name;
72			}
73
74	root	1.39	material::~material ()
75			{
76			}
77
78	root	1.32	void material::enable (view &ctx)
79			{
80	root	1.48	pass_data::matmap_t &matmap = ctx.pass->matmap;
81	root	1.32
82	root	1.48	pass_data::matmap_t::iterator i = matmap.find (this);
83	root	1.32
84			if (i == matmap.end ())
85			{
86	root	1.39	string vsh_src, fsh_src;
87	root	1.32
88			shader::shader_builder::start ();
89
90	root	1.48	if (ctx.pass->l)
91			ctx.pass->l->vsh ();
92	root	1.32
93	root	1.40	vsh (ctx);
94
95	root	1.45	// compute logarithmic depth - see the frustum matrix in view.C
96	root	1.38	{
97			using namespace shader::compile;
98
99	root	1.46	temp_1f lz;
100
101	root	1.64	// TODO: negative z is not calculated in an a very acceptable way
102	root	1.46	lz = z (vout.position);
103	root	1.64	lz = sign (lz) * (log (abs (lz) + exp (1e0)) - 1e0) / log (1e30);
104	root	1.52	z (vout.position) = lz * w (vout.position);
105	root	1.38	}
106
107	root	1.39	vsh_src = shader::shader_builder::stop ();
108	root	1.32
109	root	1.40	shader::shader_builder::start ();
110
111	root	1.48	if (ctx.pass->l)
112	root	1.39	{
113	root	1.48	ctx.pass->l->fsh ();
114	root	1.39	fsh (ctx);
115	root	1.40	}
116			else
117	root	1.52	// many drivers need both vertex and fragment shader, 'caboom!' otherwise
118	root	1.66	shader::compile::fout.frag_color = shader::compile::vec4 (0., 0., 0., 0.);
119	root	1.32
120	root	1.40	fsh_src = shader::shader_builder::stop ();
121	root	1.32
122	root	1.39	shader::program_object po = shader::get_program (vsh_src, fsh_src);
123	root	1.48	matmap.insert (pass_data::matmap_t::value_type (this, po));
124	root	1.32
125	root	1.39	po->enable ();
126	root	1.32	}
127			else
128	root	1.39	i->second->enable ();
129	root	1.45
130	root	1.48	if (ctx.pass->l)
131	root	1.57	ctx.pass->l->enable (ctx);
132	root	1.32	}
133
134			void material::disable (view &ctx)
135			{
136			}
137
138	root	1.15	test_material::test_material ()
139	root	1.23	//: tex ("textures/osama.jpg"), texvar (tex.name)
140	root	1.24	: tex ("textures/rockwall.jpg"), texvar (tex.name)
141	root	1.35	, norm ("textures/rockwall_normal.jpg"), normvar (norm.name)
142	root	1.15	{
143	root	1.32	}
144
145	root	1.65	skybox_material::skybox_material ()
146			: tex (0)
147			{
148			}
149
150			void skybox_material::enable (view &ctx)
151			{
152			material::enable (ctx);
153			}
154
155			void skybox_material::disable (view &ctx)
156			{
157			material::disable (ctx);
158			}
159
160			static shader::varying_2f skybox_texcoord;
161
162			void skybox_material::vsh (view &ctx)
163			{
164			using namespace shader::compile;
165
166			std_vsh ();
167			skybox_texcoord = xy (vin.tex_coord[0]);
168			}
169
170			void skybox_material::fsh (view &ctx)
171			{
172			using namespace shader::compile;
173
174	root	1.67	xyz (fout.frag_color) = xyz (texture_2d (tex, skybox_texcoord));
175	root	1.65	}
176
177	root	1.59	void mat_timed::enable (view &ctx)
178			{
179			material::enable (ctx);
180
181	root	1.61	time->set (timer::now);
182	root	1.59	sh_colour->set (vec3 (255, 0, 0) * (1.F / 255.F));
183			}
184
185			void mat_timed::disable (view &ctx)
186			{
187			material::disable (ctx);
188			}
189
190			void mat_timed::vsh (view &ctx)
191			{
192			using namespace shader::compile;
193			std_vsh ();
194
195			if (ctx.pass->l)
196			f_normal = normal_matrix * vin.normal;
197			}
198
199			void mat_timed::fsh (view &ctx)
200			{
201			using namespace shader::compile;
202
203			if (ctx.pass->l)
204			{
205			temp_1f fac;
206	root	1.61	temp_3f normal;
207
208	root	1.62	normal = f_normal + 0.3 * pow (sin (f_normal * 3.14159 + time), 3);
209	root	1.59
210	root	1.61	fac = dot (normalize (normal), normalize (ctx.pass->l->sh_lightvec));
211	root	1.59
212	root	1.66	xyz (fout.frag_color) = fac * shader::compile::vec3 (0.1,0.5,1);//ctx.pass->l->sh_colour * sh_colour * fac;
213	root	1.59	}
214			}
215
216	root	1.58	void mat_gouraud_shaded::enable (view &ctx)
217			{
218			material::enable (ctx);
219
220			sh_colour->set (vec3 (c.r, c.g, c.b) * (1.F / 255.F));
221			}
222
223			void mat_gouraud_shaded::disable (view &ctx)
224			{
225			material::disable (ctx);
226			}
227	root	1.32
228	root	1.58	void mat_gouraud_shaded::vsh (view &ctx)
229	root	1.56	{
230			using namespace shader::compile;
231			std_vsh ();
232
233			if (ctx.pass->l)
234	root	1.58	f_normal = normal_matrix * vin.normal;
235	root	1.56	}
236
237	root	1.58	void mat_gouraud_shaded::fsh (view &ctx)
238	root	1.56	{
239			using namespace shader::compile;
240
241			if (ctx.pass->l)
242			{
243			temp_1f fac;
244	root	1.58
245			fac = dot (normalize (f_normal), normalize (ctx.pass->l->sh_lightvec));
246
247			xyz (fout.frag_color) = ctx.pass->l->sh_colour * sh_colour * fac;
248	root	1.56	}
249			}
250
251	root	1.63	static shader::varying_3f f_normal;
252
253			void mat_debug::enable (view &ctx)
254			{
255			material::enable (ctx);
256
257			glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
258			glEnable (GL_BLEND);
259			glDepthMask (1);
260			}
261
262			void mat_debug::disable (view &ctx)
263			{
264			material::disable (ctx);
265
266			glDisable (GL_BLEND);
267			glDepthMask (0);
268			}
269
270			void mat_debug::vsh (view &ctx)
271			{
272			using namespace shader::compile;
273			std_vsh ();
274
275			if (ctx.pass->l)
276			f_normal = normal_matrix * vin.normal;
277			}
278
279			void mat_debug::fsh (view &ctx)
280			{
281			using namespace shader::compile;
282
283			if (ctx.pass->l)
284			{
285			temp_1f fac;
286
287			fac = dot (normalize (f_normal), normalize (ctx.pass->l->sh_lightvec));
288
289	root	1.66	xyz (fout.frag_color) = shader::compile::vec3 (1.,0.,0.);
290	root	1.63	w (fout.frag_color) = 0.1;
291			}
292			}
293
294	root	1.58	static shader::varying_2f texcoord;
295			static shader::varying_3f normal;
296
297	root	1.32	void test_material::vsh (view &ctx)
298			{
299	root	1.20	using namespace shader::compile;
300	root	1.15
301	root	1.32	std_vsh ();
302	root	1.15
303	root	1.48	if (ctx.pass->l)
304	root	1.32	{
305			texcoord = xy (vin.tex_coord[0]);
306			normal = normal_matrix * vin.normal;
307			}
308			}
309
310			void test_material::fsh (view &ctx)
311			{
312			using namespace shader::compile;
313	root	1.15
314	root	1.48	if (ctx.pass->l)
315	root	1.32	{
316			temp_3f lc;
317			temp_1f fac;
318
319	root	1.35	temp_3f rot1, rot2, rot3;
320
321	root	1.67	yxz (rot1) = (xyz (texture_2d (normvar, texcoord)) * 2.F - 1.F);
322	root	1.37
323			//rot1 = normal_matrix * rot1;
324
325	root	1.66	rot2 = shader::compile::vec3 (x(rot1), z(rot1), -y(rot1));
326			rot3 = shader::compile::vec3 (y(rot1), -x(rot1), z(rot1));
327	root	1.35
328			normal = mat3 (rot1, rot2, rot3) * normal;
329
330	root	1.48	fac = dot (normalize (normal), normalize (ctx.pass->l->sh_lightvec));
331	root	1.37	fac = max (pow (max (fac, 0.0), 6), 0.3);
332	root	1.67	xyz (fout.frag_color) = xyz (texture_2d (texvar, texcoord) + 0.2F)
333			* fac
334	root	1.48	* ctx.pass->l->sh_colour;
335	root	1.37	//xyz (fout.frag_color) = lc * fac;
336	root	1.32	}
337	root	1.3	}
338
339	root	1.18	void test_material::enable (view &ctx)
340	root	1.15	{
341	root	1.32	material::enable (ctx);
342	root	1.15	texvar->enable ();
343	root	1.23	normvar->enable ();
344	root	1.15	}
345	root	1.3
346	root	1.18	void test_material::disable (view &ctx)
347	root	1.6	{
348	root	1.23	normvar->disable ();
349	root	1.15	texvar->disable ();
350	root	1.32	material::disable (ctx);
351	root	1.3	}
352	root	1.8
353	root	1.34	test_material *testmat;
354	root	1.58	mat_gouraud_shaded *testmat2;
355	root	1.59	mat_timed *testmat3;
356	root	1.63	mat_debug *debugmat;
357	root	1.34