goat3dgfx: 25b911c7c35c src/rtarg.cc

goat3dgfx

view src/rtarg.cc @ 9:25b911c7c35c

fixed some line endings fixed the cubemap2.jpg file in examples/cubemap/data which was resized improperly causing seams...

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 18 Nov 2013 04:10:19 +0200
parents
children	7d6b667821cf

line source

1 #include <stack>

2 #include "rtarg.h"

3 #include "texture.h"

4 #include "logger.h"

6 RenderTarget::RenderTarget()

7 {

8 width = height = 0;

9 fbo = 0;

10 rbuf_zstencil = 0;

11 color_tex = 0;

12 tex_face = 0;

13 tex_targ = 0;

14 }

16 RenderTarget::~RenderTarget()

17 {

18 cleanup();

19 }

21 bool RenderTarget::create(unsigned int fmt)

22 {

23 int vp[4];

24 glGetIntegerv(GL_VIEWPORT, vp);

26 return create(vp[2] - vp[0], vp[3] - vp[1], fmt);

27 }

29 bool RenderTarget::create(int width, int height, unsigned int fmt)

30 {

31 debug_log("RenderTarget::create(%d, %d)\n", width, height);

32 cleanup();

34 tex_targ = GL_TEXTURE_2D;

35 this->width = width;

36 this->height = height;

37 int tex_width = next_pow2(width);

38 int tex_height = next_pow2(height);

40 CHECKGLERR;

41 color_tex = new Texture2D;

42 color_tex->create(tex_width, tex_height, fmt);

43 CHECKGLERR;

44 tex_face = 0;

46 glGenFramebuffers(1, &fbo);

47 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

49 glBindTexture(GL_TEXTURE_2D, color_tex->get_id());

50 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color_tex->get_id(), 0);

51 glBindTexture(GL_TEXTURE_2D, 0);

53 glGenRenderbuffers(1, &rbuf_zstencil);

54 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_zstencil);

55 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, tex_width, tex_height);

56 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_zstencil);

57 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbuf_zstencil);

59 glBindFramebuffer(GL_FRAMEBUFFER, 0);

60 CHECKGLERR;

61 return true;

62 }

64 bool RenderTarget::create(Texture *tex, int face)

65 {

66 debug_log("RenderTarget::create(tex{%d, %d}, face:%d)\n", tex->get_size(0),

67 tex->get_size(1), face);

69 tex_targ = GL_TEXTURE_2D;

70 if(dynamic_cast<TextureCube*>(tex)) {

71 if(face >= GL_TEXTURE_CUBE_MAP_POSITIVE_X && face <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {

72 tex_targ = face;

73 } else if(face >= 0 && face < 6) {

74 tex_targ = GL_TEXTURE_CUBE_MAP_POSITIVE_X + face;

75 } else {

76 error_log("invalid face (%d) passed to RenderTarget::create(TextureCube*, int)\n", face);

77 return false;

78 }

79 }

81 cleanup();

83 width = tex->get_size(0);

84 height = tex->get_size(1);

86 color_tex = tex;

88 glGenFramebuffers(1, &fbo);

89 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

91 glBindTexture(tex_targ, color_tex->get_id());

92 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, tex_targ, color_tex->get_id(), 0);

93 glBindTexture(tex_targ, 0);

95 glGenRenderbuffers(1, &rbuf_zstencil);

96 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_zstencil);

97 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);

98 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_zstencil);

99 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbuf_zstencil);

100

101 glBindFramebuffer(GL_FRAMEBUFFER, 0);

102 CHECKGLERR;

103 return true;

104 }

105

106 void RenderTarget::cleanup()

107 {

108 delete color_tex;

109 color_tex = 0;

110

111 if(fbo) {

112 glDeleteFramebuffers(1, &fbo);

113 }

114 if(rbuf_zstencil) {

115 glDeleteRenderbuffers(1, &rbuf_zstencil);

116 }

117

118 fbo = rbuf_zstencil = 0;

119 width = height = 0;

120 tex_face = 0;

121 tex_targ = 0;

122 }

123

124 bool RenderTarget::resize(int width, int height)

125 {

126 this->width = width;

127 this->height = height;

128 int tex_width = next_pow2(width);

129 int tex_height = next_pow2(height);

130

131 debug_log("resizing render target (fbo %u): %dx%d [%dx%d]\n", fbo, width, height, tex_width, tex_height);

132

133 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

134

135 color_tex->create(tex_width, tex_height, color_tex->get_format());

136 color_tex->bind();

137 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, tex_targ, color_tex->get_id(), 0);

138 glBindTexture(tex_targ, 0);

139

140 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_zstencil);

141 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, tex_width, tex_height);

142

143 glBindFramebuffer(GL_FRAMEBUFFER, 0);

144 return true;

145 }

146

147 int RenderTarget::get_width() const

148 {

149 return width;

150 }

151

152 int RenderTarget::get_height() const

153 {

154 return height;

155 }

156

157 Texture *RenderTarget::get_texture() const

158 {

159 return color_tex;

160 }

161

162 Matrix4x4 RenderTarget::get_texture_matrix() const

163 {

164 float sx = (float)width / (float)color_tex->get_size(0);

165 float sy = (float)height / (float)color_tex->get_size(1);

166

167 // counting on RVO to optimize this away

168 return Matrix4x4(sx, 0, 0, 0,

169 0, sy, 0, 0,

170 0, 0, 1, 0,

171 0, 0, 0, 1);

172 }

173

174

175 static const char *fbstname[] = {

176 "GL_FRAMEBUFFER_COMPLETE",

177 "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT",

178 "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT",

179 "no such fbo error",

180 "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS",

181 "GL_FRAMEBUFFER_INCOMPLETE_FORMATS",

182 "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER",

183 "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER",

184 "GL_FRAMEBUFFER_UNSUPPORTED"

185 };

186

187 bool RenderTarget::check() const

188 {

189 bool res = true;

190

191 #ifndef GL_ES_VERSION_2_0

192 int prev_fb = 0;

193 glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &prev_fb);

194 #endif

195

196 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

197

198 int status = glCheckFramebufferStatus(GL_FRAMEBUFFER);

199 if(status != GL_FRAMEBUFFER_COMPLETE) {

200 error_log("RenderTarget::check: incomplete FBO %u: %s\n", fbo,

201 fbstname[status - GL_FRAMEBUFFER_COMPLETE]);

202 res = false;

203 goto end;

204 }

205

206 end:

207 #ifndef GL_ES_VERSION_2_0

208 glBindFramebuffer(GL_FRAMEBUFFER, prev_fb);

209 #endif

210 return res;

211 }

212

213 void RenderTarget::bind() const

214 {

215 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

216

217 glViewport(0, 0, width, height);

218 }

219

220 struct Viewport { int vp[4]; };

221 static std::stack<Viewport> vpstack;

222

223 void set_render_target(const RenderTarget *rtarg)

224 {

225 Viewport vp;

226

227 if(rtarg) {

228 glGetIntegerv(GL_VIEWPORT, vp.vp);

229 vpstack.push(vp);

230

231 rtarg->bind();

232 } else {

233 #ifdef GL_ES_VERSION_2_0

234 extern unsigned int default_fbo;

235 glBindFramebuffer(GL_FRAMEBUFFER, default_fbo);

236 #else

237 glBindFramebuffer(GL_FRAMEBUFFER, 0);

238 #endif

239

240 if(vpstack.empty()) {

241 return;

242 }

243 vp = vpstack.top();

244 vpstack.pop();

245 glViewport(vp.vp[0], vp.vp[1], vp.vp[2], vp.vp[3]);

246 }

247 }

248

249 int next_pow2(int x)

250 {

251 x--;

252 x = (x >> 1) | x;

253 x = (x >> 2) | x;

254 x = (x >> 4) | x;

255 x = (x >> 8) | x;

256 x = (x >> 16) | x;

257 return x + 1;

258 }

259