/* * Cogl * * An object oriented GL/GLES Abstraction/Utility Layer * * Copyright (C) 2007,2008,2009,2010 Intel Corporation. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library. If not, see . * * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "cogl.h" #include #include #include #include #include "cogl-debug.h" #include "cogl-internal.h" #include "cogl-util.h" #include "cogl-context-private.h" #include "cogl-pipeline-private.h" #include "cogl-pipeline-opengl-private.h" #include "cogl-winsys-private.h" #include "cogl-framebuffer-private.h" #include "cogl-matrix-private.h" #include "cogl-journal-private.h" #include "cogl-bitmap-private.h" #include "cogl-texture-private.h" #include "cogl-texture-driver.h" #include "cogl-attribute-private.h" #include "cogl-framebuffer-private.h" #include "cogl-renderer-private.h" #include "cogl-config-private.h" #include "cogl-private.h" #include "cogl1-context.h" #ifndef GL_PACK_INVERT_MESA #define GL_PACK_INVERT_MESA 0x8758 #endif #ifdef COGL_GL_DEBUG /* GL error to string conversion */ static const struct { GLuint error_code; const char *error_string; } gl_errors[] = { { GL_NO_ERROR, "No error" }, { GL_INVALID_ENUM, "Invalid enumeration value" }, { GL_INVALID_VALUE, "Invalid value" }, { GL_INVALID_OPERATION, "Invalid operation" }, #ifdef HAVE_COGL_GL { GL_STACK_OVERFLOW, "Stack overflow" }, { GL_STACK_UNDERFLOW, "Stack underflow" }, #endif { GL_OUT_OF_MEMORY, "Out of memory" }, #ifdef GL_INVALID_FRAMEBUFFER_OPERATION_EXT { GL_INVALID_FRAMEBUFFER_OPERATION_EXT, "Invalid framebuffer operation" } #endif }; static const unsigned int n_gl_errors = G_N_ELEMENTS (gl_errors); const char * cogl_gl_error_to_string (GLenum error_code) { int i; for (i = 0; i < n_gl_errors; i++) { if (gl_errors[i].error_code == error_code) return gl_errors[i].error_string; } return "Unknown GL error"; } #endif /* COGL_GL_DEBUG */ CoglFuncPtr cogl_get_proc_address (const char* name) { _COGL_GET_CONTEXT (ctx, NULL); return _cogl_renderer_get_proc_address (ctx->display->renderer, name); } gboolean _cogl_check_extension (const char *name, const gchar *ext) { char *end; int name_len, n; if (name == NULL || ext == NULL) return FALSE; end = (char*)(ext + strlen(ext)); name_len = strlen(name); while (ext < end) { n = strcspn(ext, " "); if ((name_len == n) && (!strncmp(name, ext, n))) return TRUE; ext += (n + 1); } return FALSE; } /* XXX: This has been deprecated as public API */ gboolean cogl_check_extension (const char *name, const char *ext) { return _cogl_check_extension (name, ext); } /* XXX: it's expected that we'll deprecated this with * cogl_framebuffer_clear at some point. */ void cogl_clear (const CoglColor *color, unsigned long buffers) { cogl_framebuffer_clear (cogl_get_draw_framebuffer (), buffers, color); } /* XXX: This API has been deprecated */ void cogl_set_depth_test_enabled (gboolean setting) { _COGL_GET_CONTEXT (ctx, NO_RETVAL); if (ctx->legacy_depth_test_enabled == setting) return; ctx->legacy_depth_test_enabled = setting; if (ctx->legacy_depth_test_enabled) ctx->legacy_state_set++; else ctx->legacy_state_set--; } /* XXX: This API has been deprecated */ gboolean cogl_get_depth_test_enabled (void) { _COGL_GET_CONTEXT (ctx, FALSE); return ctx->legacy_depth_test_enabled; } void cogl_set_backface_culling_enabled (gboolean setting) { _COGL_GET_CONTEXT (ctx, NO_RETVAL); if (ctx->legacy_backface_culling_enabled == setting) return; ctx->legacy_backface_culling_enabled = setting; if (ctx->legacy_backface_culling_enabled) ctx->legacy_state_set++; else ctx->legacy_state_set--; } gboolean cogl_get_backface_culling_enabled (void) { _COGL_GET_CONTEXT (ctx, FALSE); return ctx->legacy_backface_culling_enabled; } void cogl_set_source_color (const CoglColor *color) { CoglPipeline *pipeline; _COGL_GET_CONTEXT (ctx, NO_RETVAL); if (cogl_color_get_alpha_byte (color) == 0xff) { cogl_pipeline_set_color (ctx->opaque_color_pipeline, color); pipeline = ctx->opaque_color_pipeline; } else { CoglColor premultiplied = *color; cogl_color_premultiply (&premultiplied); cogl_pipeline_set_color (ctx->blended_color_pipeline, &premultiplied); pipeline = ctx->blended_color_pipeline; } cogl_set_source (pipeline); } void cogl_set_viewport (int x, int y, int width, int height) { CoglFramebuffer *framebuffer; _COGL_GET_CONTEXT (ctx, NO_RETVAL); framebuffer = cogl_get_draw_framebuffer (); cogl_framebuffer_set_viewport (framebuffer, x, y, width, height); } /* XXX: This should be deprecated, and we should expose a way to also * specify an x and y viewport offset */ void cogl_viewport (unsigned int width, unsigned int height) { cogl_set_viewport (0, 0, width, height); } CoglFeatureFlags cogl_get_features (void) { _COGL_GET_CONTEXT (ctx, 0); return ctx->feature_flags; } gboolean cogl_features_available (CoglFeatureFlags features) { _COGL_GET_CONTEXT (ctx, 0); return (ctx->feature_flags & features) == features; } gboolean cogl_has_feature (CoglContext *ctx, CoglFeatureID feature) { return COGL_FLAGS_GET (ctx->features, feature); } gboolean cogl_has_features (CoglContext *ctx, ...) { va_list args; CoglFeatureID feature; va_start (args, ctx); while ((feature = va_arg (args, CoglFeatureID))) if (!cogl_has_feature (ctx, feature)) return FALSE; va_end (args); return TRUE; } void cogl_foreach_feature (CoglContext *ctx, CoglFeatureCallback callback, void *user_data) { int i; for (i = 0; i < _COGL_N_FEATURE_IDS; i++) if (COGL_FLAGS_GET (ctx->features, i)) callback (i, user_data); } /* XXX: This function should either be replaced with one returning * integers, or removed/deprecated and make the * _cogl_framebuffer_get_viewport* functions public. */ void cogl_get_viewport (float viewport[4]) { CoglFramebuffer *framebuffer; _COGL_GET_CONTEXT (ctx, NO_RETVAL); framebuffer = cogl_get_draw_framebuffer (); cogl_framebuffer_get_viewport4fv (framebuffer, viewport); } void cogl_get_bitmasks (int *red, int *green, int *blue, int *alpha) { CoglFramebuffer *framebuffer; framebuffer = cogl_get_draw_framebuffer (); if (red) *red = cogl_framebuffer_get_red_bits (framebuffer); if (green) *green = cogl_framebuffer_get_green_bits (framebuffer); if (blue) *blue = cogl_framebuffer_get_blue_bits (framebuffer); if (alpha) *alpha = cogl_framebuffer_get_alpha_bits (framebuffer); } void cogl_set_fog (const CoglColor *fog_color, CoglFogMode mode, float density, float z_near, float z_far) { _COGL_GET_CONTEXT (ctx, NO_RETVAL); if (ctx->legacy_fog_state.enabled == FALSE) ctx->legacy_state_set++; ctx->legacy_fog_state.enabled = TRUE; ctx->legacy_fog_state.color = *fog_color; ctx->legacy_fog_state.mode = mode; ctx->legacy_fog_state.density = density; ctx->legacy_fog_state.z_near = z_near; ctx->legacy_fog_state.z_far = z_far; } void cogl_disable_fog (void) { _COGL_GET_CONTEXT (ctx, NO_RETVAL); if (ctx->legacy_fog_state.enabled == TRUE) ctx->legacy_state_set--; ctx->legacy_fog_state.enabled = FALSE; } void cogl_flush (void) { GList *l; _COGL_GET_CONTEXT (ctx, NO_RETVAL); for (l = ctx->framebuffers; l; l = l->next) _cogl_framebuffer_flush_journal (l->data); } void _cogl_read_pixels_with_rowstride (int x, int y, int width, int height, CoglReadPixelsFlags source, CoglPixelFormat format, guint8 *pixels, int rowstride) { CoglFramebuffer *framebuffer = _cogl_get_read_framebuffer (); int framebuffer_height; int bpp; CoglBitmap *bmp; GLenum gl_intformat; GLenum gl_format; GLenum gl_type; CoglPixelFormat bmp_format; gboolean pack_invert_set; _COGL_GET_CONTEXT (ctx, NO_RETVAL); _COGL_RETURN_IF_FAIL (source == COGL_READ_PIXELS_COLOR_BUFFER); if (width == 1 && height == 1 && !framebuffer->clear_clip_dirty) { /* If everything drawn so far for this frame is still in the * Journal then if all of the rectangles only have a flat * opaque color we have a fast-path for reading a single pixel * that avoids the relatively high cost of flushing primitives * to be drawn on the GPU (considering how simple the geometry * is in this case) and then blocking on the long GPU pipelines * for the result. */ if (_cogl_framebuffer_try_fast_read_pixel (framebuffer, x, y, source, format, pixels)) return; } /* make sure any batched primitives get emitted to the GL driver * before issuing our read pixels... * * XXX: Note we currently use cogl_flush to ensure *all* journals * are flushed here and not _cogl_journal_flush because we don't * track the dependencies between framebuffers so we don't know if * the current framebuffer depends on the contents of other * framebuffers which could also have associated journal entries. */ cogl_flush (); _cogl_framebuffer_flush_state (cogl_get_draw_framebuffer (), framebuffer, COGL_FRAMEBUFFER_STATE_BIND); framebuffer_height = cogl_framebuffer_get_height (framebuffer); /* The y co-ordinate should be given in OpenGL's coordinate system * so 0 is the bottom row * * NB: all offscreen rendering is done upside down so no conversion * is necissary in this case. */ if (!cogl_is_offscreen (framebuffer)) y = framebuffer_height - y - height; /* Initialise the CoglBitmap */ bpp = _cogl_pixel_format_get_bytes_per_pixel (format); bmp_format = format; if ((format & COGL_A_BIT)) { /* We match the premultiplied state of the target buffer to the * premultiplied state of the framebuffer so that it will get * converted to the right format below */ if ((framebuffer->format & COGL_PREMULT_BIT)) bmp_format |= COGL_PREMULT_BIT; else bmp_format &= ~COGL_PREMULT_BIT; } bmp = _cogl_bitmap_new_from_data (pixels, bmp_format, width, height, rowstride, NULL, NULL); ctx->texture_driver->pixel_format_to_gl (format, &gl_intformat, &gl_format, &gl_type); /* NB: All offscreen rendering is done upside down so there is no need * to flip in this case... */ if ((ctx->private_feature_flags & COGL_PRIVATE_FEATURE_MESA_PACK_INVERT) && !cogl_is_offscreen (framebuffer)) { GE (ctx, glPixelStorei (GL_PACK_INVERT_MESA, TRUE)); pack_invert_set = TRUE; } else pack_invert_set = FALSE; /* Under GLES only GL_RGBA with GL_UNSIGNED_BYTE as well as an implementation specific format under GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES and GL_IMPLEMENTATION_COLOR_READ_TYPE_OES is supported. We could try to be more clever and check if the requested type matches that but we would need some reliable functions to convert from GL types to Cogl types. For now, lets just always read in GL_RGBA/GL_UNSIGNED_BYTE and convert if necessary. We also need to use this intermediate buffer if the rowstride has padding because GLES does not support setting GL_ROW_LENGTH */ if (ctx->driver != COGL_DRIVER_GL && (gl_format != GL_RGBA || gl_type != GL_UNSIGNED_BYTE || rowstride != 4 * width)) { CoglBitmap *tmp_bmp, *dst_bmp; guint8 *tmp_data = g_malloc (width * height * 4); tmp_bmp = _cogl_bitmap_new_from_data (tmp_data, COGL_PIXEL_FORMAT_RGBA_8888 | (bmp_format & COGL_PREMULT_BIT), width, height, 4 * width, (CoglBitmapDestroyNotify) g_free, NULL); ctx->texture_driver->prep_gl_for_pixels_download (4 * width, 4); GE( ctx, glReadPixels (x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, tmp_data) ); /* CoglBitmap doesn't currently have a way to convert without allocating its own buffer so we have to copy the data again */ if ((dst_bmp = _cogl_bitmap_convert_format_and_premult (tmp_bmp, format))) { _cogl_bitmap_copy_subregion (dst_bmp, bmp, 0, 0, 0, 0, width, height); cogl_object_unref (dst_bmp); } else { /* FIXME: there's no way to report an error here so we'll just have to leave the data initialised */ } cogl_object_unref (tmp_bmp); } else { ctx->texture_driver->prep_gl_for_pixels_download (rowstride, bpp); GE( ctx, glReadPixels (x, y, width, height, gl_format, gl_type, pixels) ); /* Convert to the premult format specified by the caller in-place. This will do nothing if the premult status is already correct. */ _cogl_bitmap_convert_premult_status (bmp, format); } /* Currently this function owns the pack_invert state and we don't want this * to interfere with other Cogl components so all other code can assume that * we leave the pack_invert state off. */ if (pack_invert_set) GE (ctx, glPixelStorei (GL_PACK_INVERT_MESA, FALSE)); /* NB: All offscreen rendering is done upside down so there is no need * to flip in this case... */ if (!cogl_is_offscreen (framebuffer) && !pack_invert_set) { guint8 *temprow = g_alloca (rowstride * sizeof (guint8)); /* vertically flip the buffer in-place */ for (y = 0; y < height / 2; y++) { if (y != height - y - 1) /* skip center row */ { memcpy (temprow, pixels + y * rowstride, rowstride); memcpy (pixels + y * rowstride, pixels + (height - y - 1) * rowstride, rowstride); memcpy (pixels + (height - y - 1) * rowstride, temprow, rowstride); } } } cogl_object_unref (bmp); } void cogl_read_pixels (int x, int y, int width, int height, CoglReadPixelsFlags source, CoglPixelFormat format, guint8 *pixels) { int bpp = _cogl_pixel_format_get_bytes_per_pixel (format); _cogl_read_pixels_with_rowstride (x, y, width, height, source, format, pixels, /* rowstride */ bpp * width); } void cogl_begin_gl (void) { CoglPipeline *pipeline; _COGL_GET_CONTEXT (ctx, NO_RETVAL); if (ctx->in_begin_gl_block) { static gboolean shown = FALSE; if (!shown) g_warning ("You should not nest cogl_begin_gl/cogl_end_gl blocks"); shown = TRUE; return; } ctx->in_begin_gl_block = TRUE; /* Flush all batched primitives */ cogl_flush (); /* Flush framebuffer state, including clip state, modelview and * projection matrix state * * NB: _cogl_framebuffer_flush_state may disrupt various state (such * as the pipeline state) when flushing the clip stack, so should * always be done first when preparing to draw. */ _cogl_framebuffer_flush_state (cogl_get_draw_framebuffer (), _cogl_get_read_framebuffer (), COGL_FRAMEBUFFER_STATE_ALL); /* Setup the state for the current pipeline */ /* We considered flushing a specific, minimal pipeline here to try and * simplify the GL state, but decided to avoid special cases and second * guessing what would be actually helpful. * * A user should instead call cogl_set_source_color4ub() before * cogl_begin_gl() to simplify the state flushed. * * XXX: note defining n_tex_coord_attribs using * cogl_pipeline_get_n_layers is a hack, but the problem is that * n_tex_coord_attribs is usually defined when drawing a primitive * which isn't happening here. * * Maybe it would be more useful if this code did flush the * opaque_color_pipeline and then call into cogl-pipeline-opengl.c to then * restore all state for the material's backend back to default OpenGL * values. */ pipeline = cogl_get_source (); _cogl_pipeline_flush_gl_state (pipeline, FALSE, cogl_pipeline_get_n_layers (pipeline)); /* Disable any cached vertex arrays */ _cogl_attribute_disable_cached_arrays (); } void cogl_end_gl (void) { _COGL_GET_CONTEXT (ctx, NO_RETVAL); if (!ctx->in_begin_gl_block) { static gboolean shown = FALSE; if (!shown) g_warning ("cogl_end_gl is being called before cogl_begin_gl"); shown = TRUE; return; } ctx->in_begin_gl_block = FALSE; } void cogl_push_matrix (void) { cogl_framebuffer_push_matrix (cogl_get_draw_framebuffer ()); } void cogl_pop_matrix (void) { cogl_framebuffer_pop_matrix (cogl_get_draw_framebuffer ()); } void cogl_scale (float x, float y, float z) { cogl_framebuffer_scale (cogl_get_draw_framebuffer (), x, y, z); } void cogl_translate (float x, float y, float z) { cogl_framebuffer_translate (cogl_get_draw_framebuffer (), x, y, z); } void cogl_rotate (float angle, float x, float y, float z) { cogl_framebuffer_rotate (cogl_get_draw_framebuffer (), angle, x, y, z); } void cogl_transform (const CoglMatrix *matrix) { cogl_framebuffer_transform (cogl_get_draw_framebuffer (), matrix); } void cogl_perspective (float fov_y, float aspect, float z_near, float z_far) { cogl_framebuffer_perspective (cogl_get_draw_framebuffer (), fov_y, aspect, z_near, z_far); } void cogl_frustum (float left, float right, float bottom, float top, float z_near, float z_far) { cogl_framebuffer_frustum (cogl_get_draw_framebuffer (), left, right, bottom, top, z_near, z_far); } void cogl_ortho (float left, float right, float bottom, float top, float near, float far) { cogl_framebuffer_orthographic (cogl_get_draw_framebuffer (), left, top, right, bottom, near, far); } void cogl_get_modelview_matrix (CoglMatrix *matrix) { cogl_framebuffer_get_modelview_matrix (cogl_get_draw_framebuffer (), matrix); } void cogl_set_modelview_matrix (CoglMatrix *matrix) { cogl_framebuffer_set_modelview_matrix (cogl_get_draw_framebuffer (), matrix); } void cogl_get_projection_matrix (CoglMatrix *matrix) { cogl_framebuffer_get_projection_matrix (cogl_get_draw_framebuffer (), matrix); } void cogl_set_projection_matrix (CoglMatrix *matrix) { cogl_framebuffer_set_projection_matrix (cogl_get_draw_framebuffer (), matrix); } CoglClipState * _cogl_get_clip_state (void) { CoglFramebuffer *framebuffer; framebuffer = cogl_get_draw_framebuffer (); return _cogl_framebuffer_get_clip_state (framebuffer); } GQuark _cogl_driver_error_quark (void) { return g_quark_from_static_string ("cogl-driver-error-quark"); } typedef struct _CoglSourceState { CoglPipeline *pipeline; int push_count; /* If this is TRUE then the pipeline will be copied and the legacy state will be applied whenever the pipeline is used. This is necessary because some internal Cogl code expects to be able to push a temporary pipeline to put GL into a known state. For that to work it also needs to prevent applying the legacy state */ gboolean enable_legacy; } CoglSourceState; static void _push_source_real (CoglPipeline *pipeline, gboolean enable_legacy) { CoglSourceState *top = g_slice_new (CoglSourceState); _COGL_GET_CONTEXT (ctx, NO_RETVAL); top->pipeline = cogl_object_ref (pipeline); top->enable_legacy = enable_legacy; top->push_count = 1; ctx->source_stack = g_list_prepend (ctx->source_stack, top); } /* FIXME: This should take a context pointer for Cogl 2.0 Technically * we could make it so we can retrieve a context reference from the * pipeline, but this would not by symmetric with cogl_pop_source. */ void cogl_push_source (void *material_or_pipeline) { CoglPipeline *pipeline = COGL_PIPELINE (material_or_pipeline); _COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline)); _cogl_push_source (pipeline, TRUE); } /* This internal version of cogl_push_source is the same except it never applies the legacy state. Some parts of Cogl use this internally to set a temporary pipeline with a known state */ void _cogl_push_source (CoglPipeline *pipeline, gboolean enable_legacy) { CoglSourceState *top; _COGL_GET_CONTEXT (ctx, NO_RETVAL); _COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline)); if (ctx->source_stack) { top = ctx->source_stack->data; if (top->pipeline == pipeline && top->enable_legacy == enable_legacy) { top->push_count++; return; } else _push_source_real (pipeline, enable_legacy); } else _push_source_real (pipeline, enable_legacy); } /* FIXME: This needs to take a context pointer for Cogl 2.0 */ void cogl_pop_source (void) { CoglSourceState *top; _COGL_GET_CONTEXT (ctx, NO_RETVAL); _COGL_RETURN_IF_FAIL (ctx->source_stack); top = ctx->source_stack->data; top->push_count--; if (top->push_count == 0) { cogl_object_unref (top->pipeline); g_slice_free (CoglSourceState, top); ctx->source_stack = g_list_delete_link (ctx->source_stack, ctx->source_stack); } } /* FIXME: This needs to take a context pointer for Cogl 2.0 */ void * cogl_get_source (void) { CoglSourceState *top; _COGL_GET_CONTEXT (ctx, NULL); _COGL_RETURN_VAL_IF_FAIL (ctx->source_stack, NULL); top = ctx->source_stack->data; return top->pipeline; } gboolean _cogl_get_enable_legacy_state (void) { CoglSourceState *top; _COGL_GET_CONTEXT (ctx, FALSE); _COGL_RETURN_VAL_IF_FAIL (ctx->source_stack, FALSE); top = ctx->source_stack->data; return top->enable_legacy; } void cogl_set_source (void *material_or_pipeline) { CoglSourceState *top; CoglPipeline *pipeline = COGL_PIPELINE (material_or_pipeline); _COGL_GET_CONTEXT (ctx, NO_RETVAL); _COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline)); _COGL_RETURN_IF_FAIL (ctx->source_stack); top = ctx->source_stack->data; if (top->pipeline == pipeline && top->enable_legacy) return; if (top->push_count == 1) { /* NB: top->pipeline may be only thing keeping pipeline * alive currently so ref pipeline first... */ cogl_object_ref (pipeline); cogl_object_unref (top->pipeline); top->pipeline = pipeline; top->enable_legacy = TRUE; } else { top->push_count--; cogl_push_source (pipeline); } } void cogl_set_source_texture (CoglTexture *texture) { _COGL_GET_CONTEXT (ctx, NO_RETVAL); _COGL_RETURN_IF_FAIL (texture != NULL); cogl_pipeline_set_layer_texture (ctx->texture_pipeline, 0, texture); cogl_set_source (ctx->texture_pipeline); } void cogl_set_source_color4ub (guint8 red, guint8 green, guint8 blue, guint8 alpha) { CoglColor c = { 0, }; cogl_color_init_from_4ub (&c, red, green, blue, alpha); cogl_set_source_color (&c); } void cogl_set_source_color4f (float red, float green, float blue, float alpha) { CoglColor c = { 0, }; cogl_color_init_from_4f (&c, red, green, blue, alpha); cogl_set_source_color (&c); } /* Scale from OpenGL normalized device coordinates (ranging from -1 to 1) * to Cogl window/framebuffer coordinates (ranging from 0 to buffer-size) with * (0,0) being top left. */ #define VIEWPORT_TRANSFORM_X(x, vp_origin_x, vp_width) \ ( ( ((x) + 1.0) * ((vp_width) / 2.0) ) + (vp_origin_x) ) /* Note: for Y we first flip all coordinates around the X axis while in * normalized device coodinates */ #define VIEWPORT_TRANSFORM_Y(y, vp_origin_y, vp_height) \ ( ( ((-(y)) + 1.0) * ((vp_height) / 2.0) ) + (vp_origin_y) ) /* Transform a homogeneous vertex position from model space to Cogl * window coordinates (with 0,0 being top left) */ void _cogl_transform_point (const CoglMatrix *matrix_mv, const CoglMatrix *matrix_p, const float *viewport, float *x, float *y) { float z = 0; float w = 1; /* Apply the modelview matrix transform */ cogl_matrix_transform_point (matrix_mv, x, y, &z, &w); /* Apply the projection matrix transform */ cogl_matrix_transform_point (matrix_p, x, y, &z, &w); /* Perform perspective division */ *x /= w; *y /= w; /* Apply viewport transform */ *x = VIEWPORT_TRANSFORM_X (*x, viewport[0], viewport[2]); *y = VIEWPORT_TRANSFORM_Y (*y, viewport[1], viewport[3]); } #undef VIEWPORT_TRANSFORM_X #undef VIEWPORT_TRANSFORM_Y GQuark _cogl_error_quark (void) { return g_quark_from_static_string ("cogl-error-quark"); } void _cogl_init (void) { static gsize init_status = 0; if (g_once_init_enter (&init_status)) { bindtextdomain (GETTEXT_PACKAGE, COGL_LOCALEDIR); bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8"); g_type_init (); _cogl_config_read (); _cogl_debug_check_environment (); g_once_init_leave (&init_status, 1); } } int _cogl_pixel_format_get_bytes_per_pixel (CoglPixelFormat format) { int bpp_lut[] = { 0, /* invalid */ 1, /* A_8 */ 3, /* 888 */ 4, /* 8888 */ 2, /* 565 */ 2, /* 4444 */ 2, /* 5551 */ 2, /* YUV */ 1 /* G_8 */ }; return bpp_lut [format & 0xf]; } /* Note: this also refers to the mapping defined above for * _cogl_pixel_format_get_bytes_per_pixel() */ gboolean _cogl_pixel_format_is_endian_dependant (CoglPixelFormat format) { int aligned_lut[] = { -1, 1, 1, 1, 0, 0, 0, -1, 1, 1, -1, -1, 0, 0, -1, -1}; int aligned = aligned_lut[format & 0xf]; _COGL_RETURN_VAL_IF_FAIL (aligned != -1, FALSE); /* NB: currently checking whether the format components are aligned * or not determines whether the format is endian dependent or not. * In the future though we might consider adding formats with * aligned components that are also endian independant. */ return aligned; }