/* * Cogl * * A Low Level GPU Graphics and Utilities API * * Copyright (C) 2010 Intel Corporation. * * 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. * * * * Authors: * Robert Bragg * Neil Roberts */ #include "cogl-config.h" #include "cogl-util.h" #include "cogl-object-private.h" #include "cogl-context-private.h" #include "cogl-indices.h" #include "cogl-indices-private.h" #include "cogl-index-buffer.h" #include "cogl-gtype-private.h" #include static void _cogl_indices_free (CoglIndices *indices); COGL_OBJECT_DEFINE (Indices, indices); COGL_GTYPE_DEFINE_CLASS (Indices, indices); static size_t sizeof_indices_type (CoglIndicesType type) { switch (type) { case COGL_INDICES_TYPE_UNSIGNED_BYTE: return 1; case COGL_INDICES_TYPE_UNSIGNED_SHORT: return 2; case COGL_INDICES_TYPE_UNSIGNED_INT: return 4; } g_return_val_if_reached (0); } CoglIndices * cogl_indices_new_for_buffer (CoglIndicesType type, CoglIndexBuffer *buffer, size_t offset) { CoglIndices *indices = g_slice_new (CoglIndices); indices->buffer = cogl_object_ref (buffer); indices->offset = offset; indices->type = type; indices->immutable_ref = 0; return _cogl_indices_object_new (indices); } CoglIndices * cogl_indices_new (CoglContext *context, CoglIndicesType type, const void *indices_data, int n_indices) { size_t buffer_bytes = sizeof_indices_type (type) * n_indices; CoglIndexBuffer *index_buffer = cogl_index_buffer_new (context, buffer_bytes); CoglBuffer *buffer = COGL_BUFFER (index_buffer); CoglIndices *indices; GError *ignore_error = NULL; _cogl_buffer_set_data (buffer, 0, indices_data, buffer_bytes, &ignore_error); if (ignore_error) { g_error_free (ignore_error); cogl_object_unref (index_buffer); return NULL; } indices = cogl_indices_new_for_buffer (type, index_buffer, 0); cogl_object_unref (index_buffer); return indices; } CoglIndexBuffer * cogl_indices_get_buffer (CoglIndices *indices) { return indices->buffer; } CoglIndicesType cogl_indices_get_type (CoglIndices *indices) { g_return_val_if_fail (cogl_is_indices (indices), COGL_INDICES_TYPE_UNSIGNED_BYTE); return indices->type; } size_t cogl_indices_get_offset (CoglIndices *indices) { g_return_val_if_fail (cogl_is_indices (indices), 0); return indices->offset; } static void warn_about_midscene_changes (void) { static gboolean seen = FALSE; if (!seen) { g_warning ("Mid-scene modification of indices has " "undefined results\n"); seen = TRUE; } } void cogl_indices_set_offset (CoglIndices *indices, size_t offset) { g_return_if_fail (cogl_is_indices (indices)); if (G_UNLIKELY (indices->immutable_ref)) warn_about_midscene_changes (); indices->offset = offset; } static void _cogl_indices_free (CoglIndices *indices) { cogl_object_unref (indices->buffer); g_slice_free (CoglIndices, indices); } CoglIndices * _cogl_indices_immutable_ref (CoglIndices *indices) { g_return_val_if_fail (cogl_is_indices (indices), NULL); indices->immutable_ref++; _cogl_buffer_immutable_ref (COGL_BUFFER (indices->buffer)); return indices; } void _cogl_indices_immutable_unref (CoglIndices *indices) { g_return_if_fail (cogl_is_indices (indices)); g_return_if_fail (indices->immutable_ref > 0); indices->immutable_ref--; _cogl_buffer_immutable_unref (COGL_BUFFER (indices->buffer)); } CoglIndices * cogl_get_rectangle_indices (CoglContext *ctx, int n_rectangles) { int n_indices = n_rectangles * 6; /* Check if the largest index required will fit in a byte array... */ if (n_indices <= 256 / 4 * 6) { /* Generate the byte array if we haven't already */ if (ctx->rectangle_byte_indices == NULL) { uint8_t *byte_array = g_malloc (256 / 4 * 6 * sizeof (uint8_t)); uint8_t *p = byte_array; int i, vert_num = 0; for (i = 0; i < 256 / 4; i++) { *(p++) = vert_num + 0; *(p++) = vert_num + 1; *(p++) = vert_num + 2; *(p++) = vert_num + 0; *(p++) = vert_num + 2; *(p++) = vert_num + 3; vert_num += 4; } ctx->rectangle_byte_indices = cogl_indices_new (ctx, COGL_INDICES_TYPE_UNSIGNED_BYTE, byte_array, 256 / 4 * 6); g_free (byte_array); } return ctx->rectangle_byte_indices; } else { if (ctx->rectangle_short_indices_len < n_indices) { uint16_t *short_array; uint16_t *p; int i, vert_num = 0; if (ctx->rectangle_short_indices != NULL) cogl_object_unref (ctx->rectangle_short_indices); /* Pick a power of two >= MAX (512, n_indices) */ if (ctx->rectangle_short_indices_len == 0) ctx->rectangle_short_indices_len = 512; while (ctx->rectangle_short_indices_len < n_indices) ctx->rectangle_short_indices_len *= 2; /* Over-allocate to generate a whole number of quads */ p = short_array = g_malloc ((ctx->rectangle_short_indices_len + 5) / 6 * 6 * sizeof (uint16_t)); /* Fill in the complete quads */ for (i = 0; i < ctx->rectangle_short_indices_len; i += 6) { *(p++) = vert_num + 0; *(p++) = vert_num + 1; *(p++) = vert_num + 2; *(p++) = vert_num + 0; *(p++) = vert_num + 2; *(p++) = vert_num + 3; vert_num += 4; } ctx->rectangle_short_indices = cogl_indices_new (ctx, COGL_INDICES_TYPE_UNSIGNED_SHORT, short_array, ctx->rectangle_short_indices_len); g_free (short_array); } return ctx->rectangle_short_indices; } }