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)
{
  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, GL_LINEAR_MIPMAP_LINEAR);
  glTexParameteri (GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
  glTexImage2D (GL_TEXTURE_2D,
                0,
                GL_RGBA, surface->w, surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
  SDL_FreeSurface (image);      /* No longer needed */

  return name;
}

material::~material ()
{
}

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

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

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

      shader::shader_builder::start ();

      if (ctx.pass_data->l)
        ctx.pass_data->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 acceptable way
        lz = z (vout.position);
        z (vout.position) = (log2 (lz) * (2 / log2 (1e10)) - 1) * w (vout.position);
#if 0
        z (vout.position) = 
          ifelse (
            z < 0,
            -1,
            log2 (lz) * (2 / log2 (1e10)) - 1
          ) * w (vout.position);
#endif
      }

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

      shader::shader_builder::start ();

      if (ctx.pass_data->l)
        {
          ctx.pass_data->l->fsh ();

          fsh (ctx);
        }
      else
        shader::compile::fout.frag_color = shader::compile::float4 (1., 0., 1., 1.);

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

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

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

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

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)
{
}

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

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

  std_vsh ();

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

      temp_3f rot1, rot2, rot3;

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

      //rot1 = normal_matrix * rot1;

      rot2 = float3 (x(rot1), z(rot1), -y(rot1));
      rot3 = float3 (y(rot1), -x(rot1), z(rot1));

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

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

Revision:	1.47
Committed:	Sun Nov 7 03:01:03 2004 UTC (19 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.46:	+8 -0 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			texture::load_texture (SDL_Surface * surface, GLfloat * tex2oord)
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			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
59	root	1.15	glTexParameteri (GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
60	root	1.3	glTexImage2D (GL_TEXTURE_2D,
61			0,
62	root	1.19	GL_RGBA, surface->w, surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
63	root	1.3	SDL_FreeSurface (image); /* No longer needed */
64
65	root	1.15	return name;
66			}
67
68	root	1.39	material::~material ()
69			{
70			}
71
72	root	1.32	void material::enable (view &ctx)
73			{
74			pass::matmap_t &matmap = ctx.pass_data->matmap;
75
76			pass::matmap_t::iterator i = matmap.find (this);
77
78			if (i == matmap.end ())
79			{
80	root	1.39	string vsh_src, fsh_src;
81	root	1.32
82			shader::shader_builder::start ();
83
84			if (ctx.pass_data->l)
85			ctx.pass_data->l->vsh ();
86
87	root	1.40	vsh (ctx);
88
89	root	1.45	// compute logarithmic depth - see the frustum matrix in view.C
90	root	1.38	{
91			using namespace shader::compile;
92
93	root	1.46	temp_1f lz;
94
95			// TODO: negative z is not calculated in an acceptable way
96			lz = z (vout.position);
97			z (vout.position) = (log2 (lz) * (2 / log2 (1e10)) - 1) * w (vout.position);
98	root	1.47	#if 0
99			z (vout.position) =
100			ifelse (
101			z < 0,
102			-1,
103			log2 (lz) * (2 / log2 (1e10)) - 1
104			) * w (vout.position);
105			#endif
106	root	1.38	}
107
108	root	1.39	vsh_src = shader::shader_builder::stop ();
109	root	1.32
110	root	1.40	shader::shader_builder::start ();
111
112			if (ctx.pass_data->l)
113	root	1.39	{
114	root	1.40	ctx.pass_data->l->fsh ();
115
116	root	1.39	fsh (ctx);
117	root	1.40	}
118			else
119			shader::compile::fout.frag_color = shader::compile::float4 (1., 0., 1., 1.);
120	root	1.32
121	root	1.40	fsh_src = shader::shader_builder::stop ();
122	root	1.32
123	root	1.39	shader::program_object po = shader::get_program (vsh_src, fsh_src);
124	root	1.32	matmap.insert (pass::matmap_t::value_type (this, po));
125
126	root	1.39	po->enable ();
127	root	1.32	}
128			else
129	root	1.39	i->second->enable ();
130	root	1.45
131			if (ctx.pass_data->l)
132			ctx.pass_data->l->enable ();
133	root	1.32	}
134
135			void material::disable (view &ctx)
136			{
137			}
138
139	root	1.15	test_material::test_material ()
140	root	1.23	//: tex ("textures/osama.jpg"), texvar (tex.name)
141	root	1.24	: tex ("textures/rockwall.jpg"), texvar (tex.name)
142	root	1.35	, norm ("textures/rockwall_normal.jpg"), normvar (norm.name)
143	root	1.15	{
144	root	1.32	}
145
146	root	1.40	static shader::varying_3f normal;
147	root	1.32	static shader::varying_2f texcoord;
148
149			void test_material::vsh (view &ctx)
150			{
151	root	1.20	using namespace shader::compile;
152	root	1.15
153	root	1.32	std_vsh ();
154	root	1.15
155	root	1.32	if (ctx.pass_data->l)
156			{
157			texcoord = xy (vin.tex_coord[0]);
158			normal = normal_matrix * vin.normal;
159			}
160			}
161
162			void test_material::fsh (view &ctx)
163			{
164			using namespace shader::compile;
165	root	1.15
166	root	1.32	if (ctx.pass_data->l)
167			{
168			temp_3f lc;
169			temp_1f fac;
170
171	root	1.35	temp_3f rot1, rot2, rot3;
172
173	root	1.37	yxz (rot1) = (texture_2d (normvar, texcoord) * 2.F - 1.F);
174
175			//rot1 = normal_matrix * rot1;
176
177	root	1.36	rot2 = float3 (x(rot1), z(rot1), -y(rot1));
178			rot3 = float3 (y(rot1), -x(rot1), z(rot1));
179	root	1.35
180			normal = mat3 (rot1, rot2, rot3) * normal;
181
182	root	1.40	fac = dot (normalize (normal), normalize (ctx.pass_data->l->sh_lightvec));
183	root	1.37	fac = max (pow (max (fac, 0.0), 6), 0.3);
184	root	1.40	xyz (fout.frag_color) = (texture_2d (texvar, texcoord) + 0.2F) * fac
185			* ctx.pass_data->l->sh_colour;
186	root	1.37	//xyz (fout.frag_color) = lc * fac;
187	root	1.32	}
188	root	1.3	}
189
190	root	1.18	void test_material::enable (view &ctx)
191	root	1.15	{
192	root	1.32	material::enable (ctx);
193	root	1.15	texvar->enable ();
194	root	1.23	normvar->enable ();
195	root	1.15	}
196	root	1.3
197	root	1.18	void test_material::disable (view &ctx)
198	root	1.6	{
199	root	1.23	normvar->disable ();
200	root	1.15	texvar->disable ();
201	root	1.32	material::disable (ctx);
202	root	1.3	}
203	root	1.8
204	root	1.34	test_material *testmat;
205