dungeon_crawler: f55ddab0f3a4 prototype/src/light.cc

dungeon_crawler

view prototype/src/light.cc @ 70:f55ddab0f3a4

"fixed" the disappearing lights issue

author	John Tsiombikas <nuclear@member.fsf.org>
date	Tue, 09 Oct 2012 02:54:01 +0300
parents	aa86119e3295
children	d89b403f630b

line source

1 #include <stdlib.h>

2 #include "opengl.h"

3 #include "light.h"

4 #include "renderer.h"

5 #include "timer.h"

7 unsigned int PointLight::sph_vbo = 0;

9 Light::Light(const Color &col)

10 : color(col)

11 {

12 intensity = 1.0;

13 vbo = 0;

14 num_faces = 0;

16 flicker_offset = 2.0 * (float)rand() / (float)RAND_MAX;

17 }

19 Light::~Light() {}

21 void Light::set_intensity(float val)

22 {

23 intensity = val;

24 }

26 void Light::set_color(const Color &col)

27 {

28 color = col;

29 }

31 Color Light::get_color(bool with_intensity) const

32 {

33 return with_intensity ? color * intensity : color;

34 }

36 void Light::use(int id) const

37 {

38 glLightfv(GL_LIGHT0 + id, GL_DIFFUSE, &color.x);

39 glLightfv(GL_LIGHT0 + id, GL_SPECULAR, &color.x);

40 }

42 void Light::draw() const

43 {

44 if(!vbo) {

45 if(!((Light*)this)->create_mesh()) {

46 return;

47 }

48 }

50 glEnableClientState(GL_VERTEX_ARRAY);

51 glBindBuffer(GL_ARRAY_BUFFER, vbo);

52 glVertexPointer(3, GL_FLOAT, 0, 0);

54 glDrawArrays(GL_TRIANGLES, 0, num_faces * 3);

56 glBindBuffer(GL_ARRAY_BUFFER, 0);

57 glDisableClientState(GL_VERTEX_ARRAY);

58 }

60 bool Light::create_mesh()

61 {

62 fprintf(stderr, "%s: undefined\n", __FUNCTION__);

63 return false;

64 }

67 PointLight::PointLight()

68 : Light(Color(1.0, 1.0, 1.0))

69 {

70 atten[0] = 1.0f;

71 atten[1] = 0.0f;

72 atten[2] = 0.0f;

73 radius = 1.0;

74 }

76 PointLight::PointLight(const Vector3 &pos, const Color &col)

77 : Light(col)

78 {

79 this->pos = pos;

80 atten[0] = 1.0f;

81 atten[1] = 0.0f;

82 atten[2] = 0.0f;

83 radius = 1.0;

84 }

86 void PointLight::set_position(const Vector3 &pos)

87 {

88 this->pos = pos;

89 }

91 const Vector3 &PointLight::get_position() const

92 {

93 return pos;

94 }

96 void PointLight::set_attenuation(float att_const, float att_lin, float att_quad)

97 {

98 atten[0] = att_const;

99 atten[1] = att_lin;

100 atten[2] = att_quad;

101 }

102

103 void PointLight::set_radius(float rad)

104 {

105 radius = rad;

106 }

107

108 float PointLight::get_radius() const

109 {

110 return radius;

111 }

112

113 void PointLight::use(int id) const

114 {

115 float lpos[] = {pos.x, pos.y, pos.z, 1.0f};

116 glLightfv(GL_LIGHT0 + id, GL_POSITION, lpos);

117 glLightf(GL_LIGHT0 + id, GL_CONSTANT_ATTENUATION, atten[0]);

118 glLightf(GL_LIGHT0 + id, GL_LINEAR_ATTENUATION, atten[1]);

119 glLightf(GL_LIGHT0 + id, GL_QUADRATIC_ATTENUATION, atten[2]);

120 }

121

122 void PointLight::draw() const

123 {

124 unsigned int sdr = rend->get_current_program();

125 if(sdr) {

126 int loc;

127 if((loc = glGetUniformLocation(sdr, "light_radius")) != -1) {

128 glUniform1f(loc, radius);

129 }

130 if((loc = glGetUniformLocation(sdr, "light_color")) != -1) {

131 float t = get_time_msec() / 1000.0 + flicker_offset * 4.0;

132 float intens = fbm1(t * 2.0, 2) * 0.5 + 1.0;

133 glUniform3f(loc, color.x * intens, color.y * intens, color.z * intens);

134 }

135 }

136

137 glMatrixMode(GL_MODELVIEW);

138 glPushMatrix();

139 glTranslatef(pos.x, pos.y, pos.z);

140 glScalef(radius, radius, radius);

141

142 Light::draw();

143

144 glPopMatrix();

145 }

146

147

148

149 Vector3 sphvertex(float u, float v)

150 {

151 float theta = u * M_PI * 2.0;

152 float phi = v * M_PI;

153

154 Vector3 res;

155 res.x = sin(theta) * sin(phi);

156 res.y = cos(phi);

157 res.z = cos(theta) * sin(phi);

158 return res;

159 }

160

161

162 bool PointLight::create_mesh()

163 {

164 /*if(sph_vbo) {

165 vbo = sph_vbo;

166 return true;

167 }*/

168

169 printf("building sphere mesh for point light drawing\n");

170

171 const static int udiv = 8;

172 const static int vdiv = 4;

173

174 int nquads = udiv * vdiv;

175 num_faces = nquads * 2;

176 int nverts = num_faces * 3;

177

178 float du = 1.0 / (float)udiv;

179 float dv = 1.0 / (float)vdiv;

180

181 glGenBuffers(1, &sph_vbo);

182 glBindBuffer(GL_ARRAY_BUFFER, sph_vbo);

183 glBufferData(GL_ARRAY_BUFFER, nverts * sizeof(Vector3), 0, GL_STATIC_DRAW);

184

185 Vector3 *vptr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);

186

187 for(int i=0; i<vdiv; i++) {

188 float v = (float)i / (float)vdiv;

189 for(int j=0; j<udiv; j++) {

190 float u = (float)j / (float)udiv;

191

192 *vptr++ = sphvertex(u, v + dv);

193 *vptr++ = sphvertex(u + du, v);

194 *vptr++ = sphvertex(u, v);

195

196 *vptr++ = sphvertex(u, v + dv);

197 *vptr++ = sphvertex(u + du, v + dv);

198 *vptr++ = sphvertex(u + du, v);

199 }

200 }

201 glUnmapBuffer(GL_ARRAY_BUFFER);

202 glBindBuffer(GL_ARRAY_BUFFER, 0);

203

204 vbo = sph_vbo;

205 return true;

206 }

207

208 void set_light(int id, const Light *lt)

209 {

210 if(lt) {

211 glDisable(GL_LIGHT0 + id);

212 } else {

213 glEnable(GL_LIGHT0 + id);

214 lt->use(id);

215 }

216 }