From: Michel Pollet Date: Fri, 15 Jun 2012 08:22:58 +0000 (+0100) Subject: c3gl_fbo: New bits X-Git-Url: http://git.rot13.org/?p=simavr;a=commitdiff_plain;h=e5d03e43609fb6deeed857e3f13fc4027b694c79 c3gl_fbo: New bits Implement the framebuffer objects. It doesn't cover all the cases but it'll help for now. Signed-off-by: Michel Pollet --- diff --git a/examples/shared/libc3/srcgl/c3gl_fbo.c b/examples/shared/libc3/srcgl/c3gl_fbo.c new file mode 100644 index 0000000..11bc385 --- /dev/null +++ b/examples/shared/libc3/srcgl/c3gl_fbo.c @@ -0,0 +1,160 @@ +/* + c3gl_fbo.c + + Copyright 2008-2012 Michel Pollet + + This file is part of libc3. + + simavr 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. + + simavr 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 simavr. If not, see . + */ + +#if __APPLE__ +#define GL_GLEXT_PROTOTYPES +#include +#include +#include +#else +#define GL_GLEXT_PROTOTYPES +#include +#include +#include +#endif +#include +#include + +#include "c3gl_fbo.h" + + +#define GLCHECK(_w) {_w; dumpError(#_w);} +static int dumpError(const char * what) +{ + GLenum e; + int count = 0; + while ((e = glGetError()) != GL_NO_ERROR) { + printf("%s: %s\n", what, gluErrorString(e)); + count++; + } + return count; +} + +int +c3gl_fbo_create( + c3gl_fbo_p b, + c3vec2 size, + uint32_t flags ) +{ + memset(b, 0, sizeof(*b)); + b->size = size; + b->flags = flags; + + /* Texture */ + GLCHECK(glActiveTexture(GL_TEXTURE0)); + + if (b->flags & (1 << C3GL_FBO_COLOR)) { + GLuint tex; + glGenTextures(1, &tex); + glBindTexture(GL_TEXTURE_2D, tex); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, + b->size.x, b->size.y, 0, + GL_RGBA, GL_UNSIGNED_BYTE, NULL); + glBindTexture(GL_TEXTURE_2D, 0); + b->buffers[C3GL_FBO_COLOR].bid = (c3apiobject_t)tex; + } + + /* Depth buffer */ + if (b->flags & (1 << C3GL_FBO_DEPTH)) { + GLuint rbo_depth; + GLCHECK(glGenRenderbuffers(1, &rbo_depth)); + glBindRenderbuffer(GL_RENDERBUFFER, rbo_depth); + glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, + b->size.x, b->size.y); + glBindRenderbuffer(GL_RENDERBUFFER, 0); + b->buffers[C3GL_FBO_DEPTH].bid = (c3apiobject_t)rbo_depth; + } + + /* Framebuffer to link everything together */ + GLuint fbo; + GLCHECK(glGenFramebuffers(1, &fbo)); + glBindFramebuffer(GL_FRAMEBUFFER, fbo); + + if (b->flags & (1 << C3GL_FBO_COLOR)) { + glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, + GL_TEXTURE_2D, (GLuint)b->buffers[C3GL_FBO_COLOR].bid, 0); + // Set the list of draw buffers. + GLenum DrawBuffers[2] = { GL_COLOR_ATTACHMENT0 }; + glDrawBuffers(1, DrawBuffers); // "1" is the size of DrawBuffers + } else + glDrawBuffers(0, NULL); // "1" is the size of DrawBuffers + + if (b->flags & (1 << C3GL_FBO_DEPTH)) + glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, + GL_RENDERBUFFER, (GLuint)b->buffers[C3GL_FBO_DEPTH].bid); + b->fbo = (c3apiobject_t)fbo; + + GLenum status; + if ((status = glCheckFramebufferStatus(GL_FRAMEBUFFER)) + != GL_FRAMEBUFFER_COMPLETE) { + fprintf(stderr, "%s: glCheckFramebufferStatus: error %d", __func__, (int)status); + return -1 ; + } + + glBindFramebuffer(GL_FRAMEBUFFER, 0); + return 0; +} + +void +c3gl_fbo_resize( + c3gl_fbo_p b, + c3vec2 size) +{ + b->size = size; +// Rescale FBO and RBO as well + if (b->flags & (1 << C3GL_FBO_COLOR)) { + glBindTexture(GL_TEXTURE_2D, (GLuint)b->buffers[C3GL_FBO_COLOR].bid); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, + b->size.x, b->size.y, 0, + GL_RGBA, GL_UNSIGNED_BYTE, NULL); + glBindTexture(GL_TEXTURE_2D, 0); + } + + if (b->flags & (1 << C3GL_FBO_DEPTH)) { + glBindRenderbuffer(GL_RENDERBUFFER, (GLuint)b->buffers[C3GL_FBO_DEPTH].bid); + glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, + b->size.x, b->size.y); + glBindRenderbuffer(GL_RENDERBUFFER, 0); + } +} + +void +c3gl_fbo_dispose( + c3gl_fbo_p b ) +{ + /* free_resources */ + if (b->flags & (1 << C3GL_FBO_DEPTH)) { + GLuint bid = (GLuint)b->buffers[C3GL_FBO_DEPTH].bid; + glDeleteRenderbuffers(1, &bid); + } + if (b->flags & (1 << C3GL_FBO_COLOR)) { + GLuint bid = (GLuint)b->buffers[C3GL_FBO_COLOR].bid; + glDeleteTextures(1, &bid); + } + GLuint fbo = (GLuint)b->fbo; + glDeleteFramebuffers(1, &fbo); + memset(b, 0, sizeof(*b)); +} + diff --git a/examples/shared/libc3/srcgl/c3gl_fbo.h b/examples/shared/libc3/srcgl/c3gl_fbo.h new file mode 100644 index 0000000..2ada1cf --- /dev/null +++ b/examples/shared/libc3/srcgl/c3gl_fbo.h @@ -0,0 +1,58 @@ +/* + c3gl_fbo.h + + Copyright 2008-2012 Michel Pollet + + This file is part of libc3. + + simavr 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. + + simavr 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 simavr. If not, see . + */ + + +#ifndef __C3GL_FBO_H___ +#define __C3GL_FBO_H___ + +#include "c3types.h" + +enum { + C3GL_FBO_COLOR = 0, + C3GL_FBO_DEPTH, + C3GL_FBO_MAX, +}; + +typedef struct c3gl_fbo_t { + c3vec2 size; + uint32_t flags; + c3apiobject_t fbo; + struct { + c3apiobject_t bid; + // ... ? + } buffers[8]; +} c3gl_fbo_t, *c3gl_fbo_p; + + +int +c3gl_fbo_create( + c3gl_fbo_p b, + c3vec2 size, + uint32_t flags ); +void +c3gl_fbo_resize( + c3gl_fbo_p b, + c3vec2 size); +void +c3gl_fbo_dispose( + c3gl_fbo_p b ); + +#endif /* __C3GL_FBO_H___ */