/* * 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.h" #include "cogl-pipeline-private.h" #include "cogl-pipeline-opengl-private.h" #include "cogl-winsys.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" #if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES) #include "cogl-gles2-wrapper.h" #endif #ifdef HAVE_COGL_GL #define glClientActiveTexture ctx->drv.pf_glClientActiveTexture #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" }, { GL_STACK_OVERFLOW, "Stack overflow" }, { GL_STACK_UNDERFLOW, "Stack underflow" }, { 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) { void *address; static GModule *module = NULL; address = _cogl_winsys_get_proc_address (name); if (address) return address; /* this should find the right function if the program is linked against a * library providing it */ if (G_UNLIKELY (module == NULL)) module = g_module_open (NULL, 0); if (module) { gpointer symbol; if (g_module_symbol (module, name, &symbol)) return symbol; } return NULL; } 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); } void cogl_clear (const CoglColor *color, unsigned long buffers) { GLbitfield gl_buffers = 0; COGL_NOTE (DRAW, "Clear begin"); _cogl_journal_flush (); /* 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_framebuffer (), 0); if (buffers & COGL_BUFFER_BIT_COLOR) { GE( glClearColor (cogl_color_get_red_float (color), cogl_color_get_green_float (color), cogl_color_get_blue_float (color), cogl_color_get_alpha_float (color)) ); gl_buffers |= GL_COLOR_BUFFER_BIT; } if (buffers & COGL_BUFFER_BIT_DEPTH) gl_buffers |= GL_DEPTH_BUFFER_BIT; if (buffers & COGL_BUFFER_BIT_STENCIL) gl_buffers |= GL_STENCIL_BUFFER_BIT; if (!gl_buffers) { static gboolean shown = FALSE; if (!shown) { g_warning ("You should specify at least one auxiliary buffer " "when calling cogl_clear"); } return; } GE (glClear (gl_buffers)); /* This is a debugging variable used to visually display the quad batches from the journal. It is reset here to increase the chances of getting the same colours for each frame during an animation */ if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_RECTANGLES)) { _COGL_GET_CONTEXT (ctxt, NO_RETVAL); ctxt->journal_rectangles_color = 1; } COGL_NOTE (DRAW, "Clear end"); } static gboolean toggle_flag (CoglContext *ctx, unsigned long new_flags, unsigned long flag, GLenum gl_flag) { /* Toggles and caches a single enable flag on or off * by comparing to current state */ if (new_flags & flag) { if (!(ctx->enable_flags & flag)) { GE( glEnable (gl_flag) ); ctx->enable_flags |= flag; return TRUE; } } else if (ctx->enable_flags & flag) { GE( glDisable (gl_flag) ); ctx->enable_flags &= ~flag; } return FALSE; } static gboolean toggle_client_flag (CoglContext *ctx, unsigned long new_flags, unsigned long flag, GLenum gl_flag) { /* Toggles and caches a single client-side enable flag * on or off by comparing to current state */ if (new_flags & flag) { if (!(ctx->enable_flags & flag)) { GE( glEnableClientState (gl_flag) ); ctx->enable_flags |= flag; return TRUE; } } else if (ctx->enable_flags & flag) { GE( glDisableClientState (gl_flag) ); ctx->enable_flags &= ~flag; } return FALSE; } void _cogl_enable (unsigned long flags) { /* This function essentially caches glEnable state() in the * hope of lessening number GL traffic. */ _COGL_GET_CONTEXT (ctx, NO_RETVAL); toggle_flag (ctx, flags, COGL_ENABLE_BACKFACE_CULLING, GL_CULL_FACE); toggle_client_flag (ctx, flags, COGL_ENABLE_VERTEX_ARRAY, GL_VERTEX_ARRAY); toggle_client_flag (ctx, flags, COGL_ENABLE_COLOR_ARRAY, GL_COLOR_ARRAY); } unsigned long _cogl_get_enable (void) { _COGL_GET_CONTEXT (ctx, 0); return ctx->enable_flags; } /* 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->enable_backface_culling == setting) return; /* Currently the journal can't track changes to backface culling state... */ _cogl_journal_flush (); ctx->enable_backface_culling = setting; } gboolean cogl_get_backface_culling_enabled (void) { _COGL_GET_CONTEXT (ctx, FALSE); return ctx->enable_backface_culling; } void _cogl_flush_face_winding (void) { CoglFrontWinding winding; _COGL_GET_CONTEXT (ctx, NO_RETVAL); /* The front face winding doesn't matter if we aren't performing any * backface culling... */ if (!ctx->enable_backface_culling) return; /* NB: We use a clockwise face winding order when drawing offscreen because * all offscreen rendering is done upside down resulting in reversed winding * for all triangles. */ if (cogl_is_offscreen (_cogl_get_framebuffer ())) winding = COGL_FRONT_WINDING_CLOCKWISE; else winding = COGL_FRONT_WINDING_COUNTER_CLOCKWISE; if (winding != ctx->flushed_front_winding) { if (winding == COGL_FRONT_WINDING_CLOCKWISE) GE (glFrontFace (GL_CW)); else GE (glFrontFace (GL_CCW)); ctx->flushed_front_winding = winding; } } void cogl_set_source_color (const CoglColor *color) { CoglColor premultiplied; _COGL_GET_CONTEXT (ctx, NO_RETVAL); premultiplied = *color; cogl_color_premultiply (&premultiplied); cogl_pipeline_set_color (ctx->simple_pipeline, &premultiplied); cogl_set_source (ctx->simple_pipeline); } void cogl_set_viewport (int x, int y, int width, int height) { CoglFramebuffer *framebuffer; _COGL_GET_CONTEXT (ctx, NO_RETVAL); framebuffer = _cogl_get_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); if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_VBOS)) ctx->feature_flags &= ~COGL_FEATURE_VBOS; if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_PBOS)) ctx->feature_flags &= ~COGL_FEATURE_PBOS; if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_ARBFP)) ctx->feature_flags &= ~COGL_FEATURE_SHADERS_ARBFP; if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_GLSL)) ctx->feature_flags &= ~COGL_FEATURE_SHADERS_GLSL; return ctx->feature_flags; } gboolean cogl_features_available (CoglFeatureFlags features) { _COGL_GET_CONTEXT (ctx, 0); if (!ctx->features_cached) _cogl_features_init (); return (ctx->feature_flags & features) == features; } gboolean _cogl_features_available_private (CoglFeatureFlagsPrivate features) { _COGL_GET_CONTEXT (ctx, 0); if (!ctx->features_cached) _cogl_features_init (); return (ctx->feature_flags_private & features) == features; } /* 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 v[4]) { CoglFramebuffer *framebuffer; int viewport[4]; int i; _COGL_GET_CONTEXT (ctx, NO_RETVAL); framebuffer = _cogl_get_framebuffer (); _cogl_framebuffer_get_viewport4fv (framebuffer, viewport); for (i = 0; i < 4; i++) v[i] = viewport[i]; } void cogl_get_bitmasks (int *red, int *green, int *blue, int *alpha) { CoglFramebuffer *framebuffer; framebuffer = _cogl_get_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) { _cogl_journal_flush (); } void cogl_read_pixels (int x, int y, int width, int height, CoglReadPixelsFlags source, CoglPixelFormat format, guint8 *pixels) { CoglFramebuffer *framebuffer; int framebuffer_height; int bpp; CoglBitmap *bmp; GLenum gl_intformat; GLenum gl_format; GLenum gl_type; CoglPixelFormat bmp_format; int rowstride; _COGL_GET_CONTEXT (ctx, NO_RETVAL); g_return_if_fail (source == COGL_READ_PIXELS_COLOR_BUFFER); /* make sure any batched primitives get emitted to the GL driver before * issuing our read pixels... */ cogl_flush (); framebuffer = _cogl_get_framebuffer (); _cogl_framebuffer_flush_state (framebuffer, 0); 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_get_format_bpp (format); rowstride = bpp * width; bmp_format = format; if ((format & COGL_A_BIT)) { /* FIXME: We are assuming glReadPixels will always give us premultiplied data so we'll set the premult flag on the bitmap format. This will usually be correct because the result of the default blending operations for Cogl ends up with premultiplied data in the framebuffer. However it is possible for the framebuffer to be in whatever format depending on what CoglPipeline is used to render to it. Eventually we may want to add a way for an application to inform Cogl that the framebuffer is not premultiplied in case it is being used for some special purpose. */ bmp_format |= COGL_PREMULT_BIT; } bmp = _cogl_bitmap_new_from_data (pixels, bmp_format, width, height, rowstride, NULL, NULL); _cogl_pixel_format_to_gl (format, &gl_intformat, &gl_format, &gl_type); /* 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 */ #ifndef COGL_HAS_GL if (gl_format != GL_RGBA || gl_type != GL_UNSIGNED_BYTE) { 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_PRE, width, height, 4 * width, (CoglBitmapDestroyNotify) g_free, NULL); _cogl_texture_driver_prep_gl_for_pixels_download (4 * width, 4); GE( 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, 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 #endif { _cogl_texture_driver_prep_gl_for_pixels_download (rowstride, bpp); GE( 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); } /* NB: All offscreen rendering is done upside down so there is no need * to flip in this case... */ if (!cogl_is_offscreen (framebuffer)) { guint8 *temprow = g_alloca (rowstride * sizeof (guint8)); /* TODO: consider using the GL_MESA_pack_invert extension in the future * to avoid this flip... */ /* 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); } static void _cogl_disable_other_texcoord_arrays_cb (int texcoord_array_num, gpointer data) { CoglContext *ctx = data; GE (glClientActiveTexture (GL_TEXTURE0 + texcoord_array_num)); GE (glDisableClientState (GL_TEXTURE_COORD_ARRAY)); } void _cogl_disable_other_texcoord_arrays (const CoglBitmask *mask) { _COGL_GET_CONTEXT (ctx, NO_RETVAL); /* Set texcoord_arrays_to_disable to only contain the arrays we want to disable */ _cogl_bitmask_clear_all (&ctx->texcoord_arrays_to_disable); _cogl_bitmask_set_bits (&ctx->texcoord_arrays_to_disable, &ctx->texcoord_arrays_enabled); _cogl_bitmask_clear_bits (&ctx->texcoord_arrays_to_disable, mask); _cogl_bitmask_foreach (&ctx->texcoord_arrays_to_disable, _cogl_disable_other_texcoord_arrays_cb, ctx); /* Update the mask of arrays that are enabled */ _cogl_bitmask_clear_bits (&ctx->texcoord_arrays_enabled, &ctx->texcoord_arrays_to_disable); _cogl_bitmask_set_bits (&ctx->texcoord_arrays_enabled, mask); } void cogl_begin_gl (void) { unsigned long enable_flags = 0; _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_framebuffer (), 0); /* 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. */ _cogl_pipeline_flush_gl_state (cogl_get_source (), FALSE); if (ctx->enable_backface_culling) enable_flags |= COGL_ENABLE_BACKFACE_CULLING; _cogl_enable (enable_flags); _cogl_flush_face_winding (); /* Disable all client texture coordinate arrays */ _cogl_bitmask_clear_all (&ctx->temp_bitmask); _cogl_disable_other_texcoord_arrays (&ctx->temp_bitmask); } 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) { CoglMatrixStack *modelview_stack = _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_push (modelview_stack); } void cogl_pop_matrix (void) { CoglMatrixStack *modelview_stack = _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_pop (modelview_stack); } void cogl_scale (float x, float y, float z) { CoglMatrixStack *modelview_stack = _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_scale (modelview_stack, x, y, z); } void cogl_translate (float x, float y, float z) { CoglMatrixStack *modelview_stack = _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_translate (modelview_stack, x, y, z); } void cogl_rotate (float angle, float x, float y, float z) { CoglMatrixStack *modelview_stack = _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_rotate (modelview_stack, angle, x, y, z); } void cogl_transform (const CoglMatrix *matrix) { CoglMatrixStack *modelview_stack = _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_multiply (modelview_stack, matrix); } void cogl_perspective (float fov_y, float aspect, float z_near, float z_far) { float ymax = z_near * tanf (fov_y * G_PI / 360.0); cogl_frustum (-ymax * aspect, /* left */ ymax * aspect, /* right */ -ymax, /* bottom */ ymax, /* top */ z_near, z_far); } void cogl_frustum (float left, float right, float bottom, float top, float z_near, float z_far) { CoglMatrixStack *projection_stack = _cogl_framebuffer_get_projection_stack (_cogl_get_framebuffer ()); _COGL_GET_CONTEXT (ctx, NO_RETVAL); _cogl_matrix_stack_load_identity (projection_stack); _cogl_matrix_stack_frustum (projection_stack, left, right, bottom, top, z_near, z_far); } void cogl_ortho (float left, float right, float bottom, float top, float z_near, float z_far) { CoglMatrix ortho; CoglMatrixStack *projection_stack = _cogl_framebuffer_get_projection_stack (_cogl_get_framebuffer ()); _COGL_GET_CONTEXT (ctx, NO_RETVAL); cogl_matrix_init_identity (&ortho); cogl_matrix_ortho (&ortho, left, right, bottom, top, z_near, z_far); _cogl_matrix_stack_set (projection_stack, &ortho); } void cogl_get_modelview_matrix (CoglMatrix *matrix) { CoglMatrixStack *modelview_stack = _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_get (modelview_stack, matrix); _COGL_MATRIX_DEBUG_PRINT (matrix); } void cogl_set_modelview_matrix (CoglMatrix *matrix) { CoglMatrixStack *modelview_stack = _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_set (modelview_stack, matrix); _COGL_MATRIX_DEBUG_PRINT (matrix); } void cogl_get_projection_matrix (CoglMatrix *matrix) { CoglMatrixStack *projection_stack = _cogl_framebuffer_get_projection_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_get (projection_stack, matrix); _COGL_MATRIX_DEBUG_PRINT (matrix); } void cogl_set_projection_matrix (CoglMatrix *matrix) { CoglMatrixStack *projection_stack = _cogl_framebuffer_get_projection_stack (_cogl_get_framebuffer ()); _cogl_matrix_stack_set (projection_stack, matrix); /* FIXME: Update the inverse projection matrix!! Presumably use * of clip planes must currently be broken if this API is used. */ _COGL_MATRIX_DEBUG_PRINT (matrix); } CoglClipState * _cogl_get_clip_state (void) { CoglFramebuffer *framebuffer; framebuffer = _cogl_get_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; } CoglSourceState; static void _push_source_real (CoglPipeline *pipeline) { CoglSourceState *top = g_slice_new (CoglSourceState); _COGL_GET_CONTEXT (ctx, NO_RETVAL); top->pipeline = cogl_object_ref (pipeline); 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) { CoglSourceState *top; CoglPipeline *pipeline = COGL_PIPELINE (material_or_pipeline); _COGL_GET_CONTEXT (ctx, NO_RETVAL); g_return_if_fail (cogl_is_pipeline (pipeline)); if (ctx->source_stack) { top = ctx->source_stack->data; if (top->pipeline == pipeline) { top->push_count++; return; } else _push_source_real (pipeline); } else _push_source_real (pipeline); } /* 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); g_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); g_return_val_if_fail (ctx->source_stack, NULL); top = ctx->source_stack->data; return top->pipeline; } void cogl_set_source (void *material_or_pipeline) { CoglSourceState *top; CoglPipeline *pipeline = COGL_PIPELINE (material_or_pipeline); _COGL_GET_CONTEXT (ctx, NO_RETVAL); g_return_if_fail (cogl_is_pipeline (pipeline)); g_return_if_fail (ctx->source_stack); top = ctx->source_stack->data; if (top->pipeline == pipeline) 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; } else { top->push_count--; cogl_push_source (pipeline); } } void cogl_set_source_texture (CoglHandle texture_handle) { _COGL_GET_CONTEXT (ctx, NO_RETVAL); g_return_if_fail (texture_handle != NULL); cogl_pipeline_set_layer_texture (ctx->texture_pipeline, 0, texture_handle); 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"); }