/* * Copyright (c) 2013 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ /* * Off-Screen rendering into client memory. * State tracker for gallium (for softpipe and llvmpipe) * * Notes: * * If Gallium is built with LLVM support we use the llvmpipe driver. * Otherwise we use softpipe. The GALLIUM_DRIVER environment variable * may be set to "softpipe" or "llvmpipe" to override. * * With softpipe we could render directly into the user's buffer by using a * display target resource. However, softpipe doesn't support "upside-down" * rendering which would be needed for the OSMESA_Y_UP=TRUE case. * * With llvmpipe we could only render directly into the user's buffer when its * width and height is a multiple of the tile size (64 pixels). * * Because of these constraints we always render into ordinary resources then * copy the results to the user's buffer in the flush_front() function which * is called when the app calls glFlush/Finish. * * In general, the OSMesa interface is pretty ugly and not a good match * for Gallium. But we're interested in doing the best we can to preserve * application portability. With a little work we could come up with a * much nicer, new off-screen Gallium interface... */ #include #include #include "GL/osmesa.h" #include "glapi/glapi.h" /* for OSMesaGetProcAddress below */ #include "pipe/p_context.h" #include "pipe/p_screen.h" #include "pipe/p_state.h" #include "util/u_atomic.h" #include "util/u_box.h" #include "util/u_debug.h" #include "util/format/u_format.h" #include "util/u_inlines.h" #include "util/u_memory.h" #include "postprocess/filters.h" #include "postprocess/postprocess.h" #include "state_tracker/st_api.h" #include "state_tracker/st_gl_api.h" extern struct pipe_screen * osmesa_create_screen(void); struct osmesa_buffer { struct st_framebuffer_iface *stfb; struct st_visual visual; unsigned width, height; struct pipe_resource *textures[ST_ATTACHMENT_COUNT]; void *map; struct osmesa_buffer *next; /**< next in linked list */ }; struct osmesa_context { struct st_context_iface *stctx; boolean ever_used; /*< Has this context ever been current? */ struct osmesa_buffer *current_buffer; enum pipe_format depth_stencil_format, accum_format; GLenum format; /*< User-specified context format */ GLenum type; /*< Buffer's data type */ GLint user_row_length; /*< user-specified number of pixels per row */ GLboolean y_up; /*< TRUE -> Y increases upward */ /*< FALSE -> Y increases downward */ /** Which postprocessing filters are enabled. */ unsigned pp_enabled[PP_FILTERS]; struct pp_queue_t *pp; }; /** * Linked list of all osmesa_buffers. * We can re-use an osmesa_buffer from one OSMesaMakeCurrent() call to * the next unless the color/depth/stencil/accum formats change. * We have to do this to be compatible with the original OSMesa implementation * because some apps call OSMesaMakeCurrent() several times during rendering * a frame. */ static struct osmesa_buffer *BufferList = NULL; /** * Called from the ST manager. */ static int osmesa_st_get_param(struct st_manager *smapi, enum st_manager_param param) { /* no-op */ return 0; } /** * Create/return singleton st_api object. */ static struct st_api * get_st_api(void) { static struct st_api *stapi = NULL; if (!stapi) { stapi = st_gl_api_create(); } return stapi; } static struct st_manager *stmgr = NULL; static void create_st_manager(void) { stmgr = CALLOC_STRUCT(st_manager); if (stmgr) { stmgr->screen = osmesa_create_screen(); stmgr->get_param = osmesa_st_get_param; stmgr->get_egl_image = NULL; } } /** * Create/return a singleton st_manager object. */ static struct st_manager * get_st_manager(void) { static once_flag create_once_flag = ONCE_FLAG_INIT; call_once(&create_once_flag, create_st_manager); return stmgr; } /** * Given an OSMESA_x format and a GL_y type, return the best * matching PIPE_FORMAT_z. * Note that we can't exactly match all user format/type combinations * with gallium formats. If we find this to be a problem, we can * implement more elaborate format/type conversion in the flush_front() * function. */ static enum pipe_format osmesa_choose_format(GLenum format, GLenum type) { switch (format) { case OSMESA_RGBA: if (type == GL_UNSIGNED_BYTE) { #if UTIL_ARCH_LITTLE_ENDIAN return PIPE_FORMAT_R8G8B8A8_UNORM; #else return PIPE_FORMAT_A8B8G8R8_UNORM; #endif } else if (type == GL_UNSIGNED_SHORT) { return PIPE_FORMAT_R16G16B16A16_UNORM; } else if (type == GL_FLOAT) { return PIPE_FORMAT_R32G32B32A32_FLOAT; } else { return PIPE_FORMAT_NONE; } break; case OSMESA_BGRA: if (type == GL_UNSIGNED_BYTE) { #if UTIL_ARCH_LITTLE_ENDIAN return PIPE_FORMAT_B8G8R8A8_UNORM; #else return PIPE_FORMAT_A8R8G8B8_UNORM; #endif } else if (type == GL_UNSIGNED_SHORT) { return PIPE_FORMAT_R16G16B16A16_UNORM; } else if (type == GL_FLOAT) { return PIPE_FORMAT_R32G32B32A32_FLOAT; } else { return PIPE_FORMAT_NONE; } break; case OSMESA_ARGB: if (type == GL_UNSIGNED_BYTE) { #if UTIL_ARCH_LITTLE_ENDIAN return PIPE_FORMAT_A8R8G8B8_UNORM; #else return PIPE_FORMAT_B8G8R8A8_UNORM; #endif } else if (type == GL_UNSIGNED_SHORT) { return PIPE_FORMAT_R16G16B16A16_UNORM; } else if (type == GL_FLOAT) { return PIPE_FORMAT_R32G32B32A32_FLOAT; } else { return PIPE_FORMAT_NONE; } break; case OSMESA_RGB: if (type == GL_UNSIGNED_BYTE) { return PIPE_FORMAT_R8G8B8_UNORM; } else if (type == GL_UNSIGNED_SHORT) { return PIPE_FORMAT_R16G16B16_UNORM; } else if (type == GL_FLOAT) { return PIPE_FORMAT_R32G32B32_FLOAT; } else { return PIPE_FORMAT_NONE; } break; case OSMESA_BGR: /* No gallium format for this one */ return PIPE_FORMAT_NONE; case OSMESA_RGB_565: if (type != GL_UNSIGNED_SHORT_5_6_5) return PIPE_FORMAT_NONE; return PIPE_FORMAT_B5G6R5_UNORM; default: ; /* fall-through */ } return PIPE_FORMAT_NONE; } /** * Initialize an st_visual object. */ static void osmesa_init_st_visual(struct st_visual *vis, enum pipe_format color_format, enum pipe_format ds_format, enum pipe_format accum_format) { vis->buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK; if (ds_format != PIPE_FORMAT_NONE) vis->buffer_mask |= ST_ATTACHMENT_DEPTH_STENCIL_MASK; if (accum_format != PIPE_FORMAT_NONE) vis->buffer_mask |= ST_ATTACHMENT_ACCUM; vis->color_format = color_format; vis->depth_stencil_format = ds_format; vis->accum_format = accum_format; vis->samples = 1; vis->render_buffer = ST_ATTACHMENT_FRONT_LEFT; } /** * Return the osmesa_buffer that corresponds to an st_framebuffer_iface. */ static inline struct osmesa_buffer * stfbi_to_osbuffer(struct st_framebuffer_iface *stfbi) { return (struct osmesa_buffer *) stfbi->st_manager_private; } /** * Called via glFlush/glFinish. This is where we copy the contents * of the driver's color buffer into the user-specified buffer. */ static bool osmesa_st_framebuffer_flush_front(struct st_context_iface *stctx, struct st_framebuffer_iface *stfbi, enum st_attachment_type statt) { OSMesaContext osmesa = OSMesaGetCurrentContext(); struct osmesa_buffer *osbuffer = stfbi_to_osbuffer(stfbi); struct pipe_context *pipe = stctx->pipe; struct pipe_resource *res = osbuffer->textures[statt]; struct pipe_transfer *transfer = NULL; struct pipe_box box; void *map; ubyte *src, *dst; unsigned y, bytes, bpp; int dst_stride; if (osmesa->pp) { struct pipe_resource *zsbuf = NULL; unsigned i; /* Find the z/stencil buffer if there is one */ for (i = 0; i < ARRAY_SIZE(osbuffer->textures); i++) { struct pipe_resource *res = osbuffer->textures[i]; if (res) { const struct util_format_description *desc = util_format_description(res->format); if (util_format_has_depth(desc)) { zsbuf = res; break; } } } /* run the postprocess stage(s) */ pp_run(osmesa->pp, res, res, zsbuf); } u_box_2d(0, 0, res->width0, res->height0, &box); map = pipe->transfer_map(pipe, res, 0, PIPE_TRANSFER_READ, &box, &transfer); /* * Copy the color buffer from the resource to the user's buffer. */ bpp = util_format_get_blocksize(osbuffer->visual.color_format); src = map; dst = osbuffer->map; if (osmesa->user_row_length) dst_stride = bpp * osmesa->user_row_length; else dst_stride = bpp * osbuffer->width; bytes = bpp * res->width0; if (osmesa->y_up) { /* need to flip image upside down */ dst = dst + (res->height0 - 1) * dst_stride; dst_stride = -dst_stride; } for (y = 0; y < res->height0; y++) { memcpy(dst, src, bytes); dst += dst_stride; src += transfer->stride; } pipe->transfer_unmap(pipe, transfer); return true; } /** * Called by the st manager to validate the framebuffer (allocate * its resources). */ static bool osmesa_st_framebuffer_validate(struct st_context_iface *stctx, struct st_framebuffer_iface *stfbi, const enum st_attachment_type *statts, unsigned count, struct pipe_resource **out) { struct pipe_screen *screen = get_st_manager()->screen; enum st_attachment_type i; struct osmesa_buffer *osbuffer = stfbi_to_osbuffer(stfbi); struct pipe_resource templat; memset(&templat, 0, sizeof(templat)); templat.target = PIPE_TEXTURE_RECT; templat.format = 0; /* setup below */ templat.last_level = 0; templat.width0 = osbuffer->width; templat.height0 = osbuffer->height; templat.depth0 = 1; templat.array_size = 1; templat.usage = PIPE_USAGE_DEFAULT; templat.bind = 0; /* setup below */ templat.flags = 0; for (i = 0; i < count; i++) { enum pipe_format format = PIPE_FORMAT_NONE; unsigned bind = 0; /* * At this time, we really only need to handle the front-left color * attachment, since that's all we specified for the visual in * osmesa_init_st_visual(). */ if (statts[i] == ST_ATTACHMENT_FRONT_LEFT) { format = osbuffer->visual.color_format; bind = PIPE_BIND_RENDER_TARGET; } else if (statts[i] == ST_ATTACHMENT_DEPTH_STENCIL) { format = osbuffer->visual.depth_stencil_format; bind = PIPE_BIND_DEPTH_STENCIL; } else if (statts[i] == ST_ATTACHMENT_ACCUM) { format = osbuffer->visual.accum_format; bind = PIPE_BIND_RENDER_TARGET; } else { debug_warning("Unexpected attachment type in " "osmesa_st_framebuffer_validate()"); } templat.format = format; templat.bind = bind; pipe_resource_reference(&out[i], NULL); out[i] = osbuffer->textures[statts[i]] = screen->resource_create(screen, &templat); } return true; } static uint32_t osmesa_fb_ID = 0; static struct st_framebuffer_iface * osmesa_create_st_framebuffer(void) { struct st_framebuffer_iface *stfbi = CALLOC_STRUCT(st_framebuffer_iface); if (stfbi) { stfbi->flush_front = osmesa_st_framebuffer_flush_front; stfbi->validate = osmesa_st_framebuffer_validate; p_atomic_set(&stfbi->stamp, 1); stfbi->ID = p_atomic_inc_return(&osmesa_fb_ID); stfbi->state_manager = get_st_manager(); } return stfbi; } /** * Create new buffer and add to linked list. */ static struct osmesa_buffer * osmesa_create_buffer(enum pipe_format color_format, enum pipe_format ds_format, enum pipe_format accum_format) { struct osmesa_buffer *osbuffer = CALLOC_STRUCT(osmesa_buffer); if (osbuffer) { osbuffer->stfb = osmesa_create_st_framebuffer(); osbuffer->stfb->st_manager_private = osbuffer; osbuffer->stfb->visual = &osbuffer->visual; osmesa_init_st_visual(&osbuffer->visual, color_format, ds_format, accum_format); /* insert into linked list */ osbuffer->next = BufferList; BufferList = osbuffer; } return osbuffer; } /** * Search linked list for a buffer with matching pixel formats and size. */ static struct osmesa_buffer * osmesa_find_buffer(enum pipe_format color_format, enum pipe_format ds_format, enum pipe_format accum_format, GLsizei width, GLsizei height) { struct osmesa_buffer *b; /* Check if we already have a suitable buffer for the given formats */ for (b = BufferList; b; b = b->next) { if (b->visual.color_format == color_format && b->visual.depth_stencil_format == ds_format && b->visual.accum_format == accum_format && b->width == width && b->height == height) { return b; } } return NULL; } static void osmesa_destroy_buffer(struct osmesa_buffer *osbuffer) { struct st_api *stapi = get_st_api(); /* * Notify the state manager that the associated framebuffer interface * is no longer valid. */ stapi->destroy_drawable(stapi, osbuffer->stfb); FREE(osbuffer->stfb); FREE(osbuffer); } /**********************************************************************/ /***** Public Functions *****/ /**********************************************************************/ /** * Create an Off-Screen Mesa rendering context. The only attribute needed is * an RGBA vs Color-Index mode flag. * * Input: format - Must be GL_RGBA * sharelist - specifies another OSMesaContext with which to share * display lists. NULL indicates no sharing. * Return: an OSMesaContext or 0 if error */ GLAPI OSMesaContext GLAPIENTRY OSMesaCreateContext(GLenum format, OSMesaContext sharelist) { return OSMesaCreateContextExt(format, 24, 8, 0, sharelist); } /** * New in Mesa 3.5 * * Create context and specify size of ancillary buffers. */ GLAPI OSMesaContext GLAPIENTRY OSMesaCreateContextExt(GLenum format, GLint depthBits, GLint stencilBits, GLint accumBits, OSMesaContext sharelist) { int attribs[100], n = 0; attribs[n++] = OSMESA_FORMAT; attribs[n++] = format; attribs[n++] = OSMESA_DEPTH_BITS; attribs[n++] = depthBits; attribs[n++] = OSMESA_STENCIL_BITS; attribs[n++] = stencilBits; attribs[n++] = OSMESA_ACCUM_BITS; attribs[n++] = accumBits; attribs[n++] = 0; return OSMesaCreateContextAttribs(attribs, sharelist); } /** * New in Mesa 11.2 * * Create context with attribute list. */ GLAPI OSMesaContext GLAPIENTRY OSMesaCreateContextAttribs(const int *attribList, OSMesaContext sharelist) { OSMesaContext osmesa; struct st_context_iface *st_shared; enum st_context_error st_error = 0; struct st_context_attribs attribs; struct st_api *stapi = get_st_api(); GLenum format = GL_RGBA; int depthBits = 0, stencilBits = 0, accumBits = 0; int profile = OSMESA_COMPAT_PROFILE, version_major = 1, version_minor = 0; int i; if (sharelist) { st_shared = sharelist->stctx; } else { st_shared = NULL; } for (i = 0; attribList[i]; i += 2) { switch (attribList[i]) { case OSMESA_FORMAT: format = attribList[i+1]; switch (format) { case OSMESA_COLOR_INDEX: case OSMESA_RGBA: case OSMESA_BGRA: case OSMESA_ARGB: case OSMESA_RGB: case OSMESA_BGR: case OSMESA_RGB_565: /* legal */ break; default: return NULL; } break; case OSMESA_DEPTH_BITS: depthBits = attribList[i+1]; if (depthBits < 0) return NULL; break; case OSMESA_STENCIL_BITS: stencilBits = attribList[i+1]; if (stencilBits < 0) return NULL; break; case OSMESA_ACCUM_BITS: accumBits = attribList[i+1]; if (accumBits < 0) return NULL; break; case OSMESA_PROFILE: profile = attribList[i+1]; if (profile != OSMESA_CORE_PROFILE && profile != OSMESA_COMPAT_PROFILE) return NULL; break; case OSMESA_CONTEXT_MAJOR_VERSION: version_major = attribList[i+1]; if (version_major < 1) return NULL; break; case OSMESA_CONTEXT_MINOR_VERSION: version_minor = attribList[i+1]; if (version_minor < 0) return NULL; break; case 0: /* end of list */ break; default: fprintf(stderr, "Bad attribute in OSMesaCreateContextAttribs()\n"); return NULL; } } osmesa = (OSMesaContext) CALLOC_STRUCT(osmesa_context); if (!osmesa) return NULL; /* Choose depth/stencil/accum buffer formats */ if (accumBits > 0) { osmesa->accum_format = PIPE_FORMAT_R16G16B16A16_SNORM; } if (depthBits > 0 && stencilBits > 0) { osmesa->depth_stencil_format = PIPE_FORMAT_Z24_UNORM_S8_UINT; } else if (stencilBits > 0) { osmesa->depth_stencil_format = PIPE_FORMAT_S8_UINT; } else if (depthBits >= 24) { osmesa->depth_stencil_format = PIPE_FORMAT_Z24X8_UNORM; } else if (depthBits >= 16) { osmesa->depth_stencil_format = PIPE_FORMAT_Z16_UNORM; } /* * Create the rendering context */ memset(&attribs, 0, sizeof(attribs)); attribs.profile = (profile == OSMESA_CORE_PROFILE) ? ST_PROFILE_OPENGL_CORE : ST_PROFILE_DEFAULT; attribs.major = version_major; attribs.minor = version_minor; attribs.flags = 0; /* ST_CONTEXT_FLAG_x */ attribs.options.force_glsl_extensions_warn = FALSE; attribs.options.disable_blend_func_extended = FALSE; attribs.options.disable_glsl_line_continuations = FALSE; attribs.options.force_glsl_version = 0; osmesa_init_st_visual(&attribs.visual, PIPE_FORMAT_NONE, osmesa->depth_stencil_format, osmesa->accum_format); osmesa->stctx = stapi->create_context(stapi, get_st_manager(), &attribs, &st_error, st_shared); if (!osmesa->stctx) { FREE(osmesa); return NULL; } osmesa->stctx->st_manager_private = osmesa; osmesa->format = format; osmesa->user_row_length = 0; osmesa->y_up = GL_TRUE; return osmesa; } /** * Destroy an Off-Screen Mesa rendering context. * * \param osmesa the context to destroy */ GLAPI void GLAPIENTRY OSMesaDestroyContext(OSMesaContext osmesa) { if (osmesa) { pp_free(osmesa->pp); osmesa->stctx->destroy(osmesa->stctx); FREE(osmesa); } } /** * Bind an OSMesaContext to an image buffer. The image buffer is just a * block of memory which the client provides. Its size must be at least * as large as width*height*pixelSize. Its address should be a multiple * of 4 if using RGBA mode. * * By default, image data is stored in the order of glDrawPixels: row-major * order with the lower-left image pixel stored in the first array position * (ie. bottom-to-top). * * If the context's viewport hasn't been initialized yet, it will now be * initialized to (0,0,width,height). * * Input: osmesa - the rendering context * buffer - the image buffer memory * type - data type for pixel components * GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT * or GL_FLOAT. * width, height - size of image buffer in pixels, at least 1 * Return: GL_TRUE if success, GL_FALSE if error because of invalid osmesa, * invalid type, invalid size, etc. */ GLAPI GLboolean GLAPIENTRY OSMesaMakeCurrent(OSMesaContext osmesa, void *buffer, GLenum type, GLsizei width, GLsizei height) { struct st_api *stapi = get_st_api(); struct osmesa_buffer *osbuffer; enum pipe_format color_format; if (!osmesa && !buffer) { stapi->make_current(stapi, NULL, NULL, NULL); return GL_TRUE; } if (!osmesa || !buffer || width < 1 || height < 1) { return GL_FALSE; } color_format = osmesa_choose_format(osmesa->format, type); if (color_format == PIPE_FORMAT_NONE) { fprintf(stderr, "OSMesaMakeCurrent(unsupported format/type)\n"); return GL_FALSE; } /* See if we already have a buffer that uses these pixel formats */ osbuffer = osmesa_find_buffer(color_format, osmesa->depth_stencil_format, osmesa->accum_format, width, height); if (!osbuffer) { /* Existing buffer found, create new buffer */ osbuffer = osmesa_create_buffer(color_format, osmesa->depth_stencil_format, osmesa->accum_format); } osbuffer->width = width; osbuffer->height = height; osbuffer->map = buffer; /* XXX unused for now */ (void) osmesa_destroy_buffer; osmesa->current_buffer = osbuffer; osmesa->type = type; stapi->make_current(stapi, osmesa->stctx, osbuffer->stfb, osbuffer->stfb); if (!osmesa->ever_used) { /* one-time init, just postprocessing for now */ boolean any_pp_enabled = FALSE; unsigned i; for (i = 0; i < ARRAY_SIZE(osmesa->pp_enabled); i++) { if (osmesa->pp_enabled[i]) { any_pp_enabled = TRUE; break; } } if (any_pp_enabled) { osmesa->pp = pp_init(osmesa->stctx->pipe, osmesa->pp_enabled, osmesa->stctx->cso_context); pp_init_fbos(osmesa->pp, width, height); } osmesa->ever_used = TRUE; } return GL_TRUE; } GLAPI OSMesaContext GLAPIENTRY OSMesaGetCurrentContext(void) { struct st_api *stapi = get_st_api(); struct st_context_iface *st = stapi->get_current(stapi); return st ? (OSMesaContext) st->st_manager_private : NULL; } GLAPI void GLAPIENTRY OSMesaPixelStore(GLint pname, GLint value) { OSMesaContext osmesa = OSMesaGetCurrentContext(); switch (pname) { case OSMESA_ROW_LENGTH: osmesa->user_row_length = value; break; case OSMESA_Y_UP: osmesa->y_up = value ? GL_TRUE : GL_FALSE; break; default: fprintf(stderr, "Invalid pname in OSMesaPixelStore()\n"); return; } } GLAPI void GLAPIENTRY OSMesaGetIntegerv(GLint pname, GLint *value) { OSMesaContext osmesa = OSMesaGetCurrentContext(); struct osmesa_buffer *osbuffer = osmesa ? osmesa->current_buffer : NULL; switch (pname) { case OSMESA_WIDTH: *value = osbuffer ? osbuffer->width : 0; return; case OSMESA_HEIGHT: *value = osbuffer ? osbuffer->height : 0; return; case OSMESA_FORMAT: *value = osmesa->format; return; case OSMESA_TYPE: /* current color buffer's data type */ *value = osmesa->type; return; case OSMESA_ROW_LENGTH: *value = osmesa->user_row_length; return; case OSMESA_Y_UP: *value = osmesa->y_up; return; case OSMESA_MAX_WIDTH: /* fall-through */ case OSMESA_MAX_HEIGHT: { struct pipe_screen *screen = get_st_manager()->screen; *value = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_SIZE); } return; default: fprintf(stderr, "Invalid pname in OSMesaGetIntegerv()\n"); return; } } /** * Return information about the depth buffer associated with an OSMesa context. * Input: c - the OSMesa context * Output: width, height - size of buffer in pixels * bytesPerValue - bytes per depth value (2 or 4) * buffer - pointer to depth buffer values * Return: GL_TRUE or GL_FALSE to indicate success or failure. */ GLAPI GLboolean GLAPIENTRY OSMesaGetDepthBuffer(OSMesaContext c, GLint *width, GLint *height, GLint *bytesPerValue, void **buffer) { struct osmesa_buffer *osbuffer = c->current_buffer; struct pipe_context *pipe = c->stctx->pipe; struct pipe_resource *res = osbuffer->textures[ST_ATTACHMENT_DEPTH_STENCIL]; struct pipe_transfer *transfer = NULL; struct pipe_box box; /* * Note: we can't really implement this function with gallium as * we did for swrast. We can't just map the resource and leave it * mapped (and there's no OSMesaUnmapDepthBuffer() function) so * we unmap the buffer here and return a 'stale' pointer. This should * actually be OK in most cases where the caller of this function * immediately uses the pointer. */ u_box_2d(0, 0, res->width0, res->height0, &box); *buffer = pipe->transfer_map(pipe, res, 0, PIPE_TRANSFER_READ, &box, &transfer); if (!*buffer) { return GL_FALSE; } *width = res->width0; *height = res->height0; *bytesPerValue = util_format_get_blocksize(res->format); pipe->transfer_unmap(pipe, transfer); return GL_TRUE; } /** * Return the color buffer associated with an OSMesa context. * Input: c - the OSMesa context * Output: width, height - size of buffer in pixels * format - the pixel format (OSMESA_FORMAT) * buffer - pointer to color buffer values * Return: GL_TRUE or GL_FALSE to indicate success or failure. */ GLAPI GLboolean GLAPIENTRY OSMesaGetColorBuffer(OSMesaContext osmesa, GLint *width, GLint *height, GLint *format, void **buffer) { struct osmesa_buffer *osbuffer = osmesa->current_buffer; if (osbuffer) { *width = osbuffer->width; *height = osbuffer->height; *format = osmesa->format; *buffer = osbuffer->map; return GL_TRUE; } else { *width = 0; *height = 0; *format = 0; *buffer = 0; return GL_FALSE; } } struct name_function { const char *Name; OSMESAproc Function; }; static struct name_function functions[] = { { "OSMesaCreateContext", (OSMESAproc) OSMesaCreateContext }, { "OSMesaCreateContextExt", (OSMESAproc) OSMesaCreateContextExt }, { "OSMesaCreateContextAttribs", (OSMESAproc) OSMesaCreateContextAttribs }, { "OSMesaDestroyContext", (OSMESAproc) OSMesaDestroyContext }, { "OSMesaMakeCurrent", (OSMESAproc) OSMesaMakeCurrent }, { "OSMesaGetCurrentContext", (OSMESAproc) OSMesaGetCurrentContext }, { "OSMesaPixelStore", (OSMESAproc) OSMesaPixelStore }, { "OSMesaGetIntegerv", (OSMESAproc) OSMesaGetIntegerv }, { "OSMesaGetDepthBuffer", (OSMESAproc) OSMesaGetDepthBuffer }, { "OSMesaGetColorBuffer", (OSMESAproc) OSMesaGetColorBuffer }, { "OSMesaGetProcAddress", (OSMESAproc) OSMesaGetProcAddress }, { "OSMesaColorClamp", (OSMESAproc) OSMesaColorClamp }, { "OSMesaPostprocess", (OSMESAproc) OSMesaPostprocess }, { NULL, NULL } }; GLAPI OSMESAproc GLAPIENTRY OSMesaGetProcAddress(const char *funcName) { int i; for (i = 0; functions[i].Name; i++) { if (strcmp(functions[i].Name, funcName) == 0) return functions[i].Function; } return _glapi_get_proc_address(funcName); } GLAPI void GLAPIENTRY OSMesaColorClamp(GLboolean enable) { extern void GLAPIENTRY _mesa_ClampColor(GLenum target, GLenum clamp); _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR_ARB, enable ? GL_TRUE : GL_FIXED_ONLY_ARB); } GLAPI void GLAPIENTRY OSMesaPostprocess(OSMesaContext osmesa, const char *filter, unsigned enable_value) { if (!osmesa->ever_used) { /* We can only enable/disable postprocess filters before a context * is made current for the first time. */ unsigned i; for (i = 0; i < PP_FILTERS; i++) { if (strcmp(pp_filters[i].name, filter) == 0) { osmesa->pp_enabled[i] = enable_value; return; } } debug_warning("OSMesaPostprocess(unknown filter)\n"); } else { debug_warning("Calling OSMesaPostprocess() after OSMesaMakeCurrent()\n"); } }