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Diffstat (limited to 'intern/gawain/src/gwn_element.c')
-rw-r--r--intern/gawain/src/gwn_element.c304
1 files changed, 0 insertions, 304 deletions
diff --git a/intern/gawain/src/gwn_element.c b/intern/gawain/src/gwn_element.c
deleted file mode 100644
index 257338fe089..00000000000
--- a/intern/gawain/src/gwn_element.c
+++ /dev/null
@@ -1,304 +0,0 @@
-
-// Gawain element list (AKA index buffer)
-//
-// This code is part of the Gawain library, with modifications
-// specific to integration with Blender.
-//
-// Copyright 2016 Mike Erwin
-//
-// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
-// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
-
-#include "gwn_element.h"
-#include "gwn_buffer_id.h"
-#include <stdlib.h>
-
-#define KEEP_SINGLE_COPY 1
-
-static GLenum convert_index_type_to_gl(Gwn_IndexBufType type)
- {
- static const GLenum table[] = {
- [GWN_INDEX_U8] = GL_UNSIGNED_BYTE, // GL has this, Vulkan does not
- [GWN_INDEX_U16] = GL_UNSIGNED_SHORT,
- [GWN_INDEX_U32] = GL_UNSIGNED_INT
- };
- return table[type];
- }
-
-unsigned GWN_indexbuf_size_get(const Gwn_IndexBuf* elem)
- {
-#if GWN_TRACK_INDEX_RANGE
- static const unsigned table[] = {
- [GWN_INDEX_U8] = sizeof(GLubyte), // GL has this, Vulkan does not
- [GWN_INDEX_U16] = sizeof(GLushort),
- [GWN_INDEX_U32] = sizeof(GLuint)
- };
- return elem->index_len * table[elem->index_type];
-#else
- return elem->index_len * sizeof(GLuint);
-#endif
- }
-
-void GWN_indexbuf_init_ex(Gwn_IndexBufBuilder* builder, Gwn_PrimType prim_type, unsigned index_len, unsigned vertex_len, bool use_prim_restart)
- {
- builder->use_prim_restart = use_prim_restart;
- builder->max_allowed_index = vertex_len - 1;
- builder->max_index_len = index_len;
- builder->index_len = 0; // start empty
- builder->prim_type = prim_type;
- builder->data = calloc(builder->max_index_len, sizeof(unsigned));
- }
-
-void GWN_indexbuf_init(Gwn_IndexBufBuilder* builder, Gwn_PrimType prim_type, unsigned prim_len, unsigned vertex_len)
- {
- unsigned verts_per_prim = 0;
- switch (prim_type)
- {
- case GWN_PRIM_POINTS:
- verts_per_prim = 1;
- break;
- case GWN_PRIM_LINES:
- verts_per_prim = 2;
- break;
- case GWN_PRIM_TRIS:
- verts_per_prim = 3;
- break;
- case GWN_PRIM_LINES_ADJ:
- verts_per_prim = 4;
- break;
- default:
-#if TRUST_NO_ONE
- assert(false);
-#endif
- return;
- }
-
- GWN_indexbuf_init_ex(builder, prim_type, prim_len * verts_per_prim, vertex_len, false);
- }
-
-void GWN_indexbuf_add_generic_vert(Gwn_IndexBufBuilder* builder, unsigned v)
- {
-#if TRUST_NO_ONE
- assert(builder->data != NULL);
- assert(builder->index_len < builder->max_index_len);
- assert(v <= builder->max_allowed_index);
-#endif
-
- builder->data[builder->index_len++] = v;
- }
-
-void GWN_indexbuf_add_primitive_restart(Gwn_IndexBufBuilder* builder)
- {
-#if TRUST_NO_ONE
- assert(builder->data != NULL);
- assert(builder->index_len < builder->max_index_len);
- assert(builder->use_prim_restart);
-#endif
-
- builder->data[builder->index_len++] = GWN_PRIM_RESTART;
- }
-
-void GWN_indexbuf_add_point_vert(Gwn_IndexBufBuilder* builder, unsigned v)
- {
-#if TRUST_NO_ONE
- assert(builder->prim_type == GWN_PRIM_POINTS);
-#endif
-
- GWN_indexbuf_add_generic_vert(builder, v);
- }
-
-void GWN_indexbuf_add_line_verts(Gwn_IndexBufBuilder* builder, unsigned v1, unsigned v2)
- {
-#if TRUST_NO_ONE
- assert(builder->prim_type == GWN_PRIM_LINES);
- assert(v1 != v2);
-#endif
-
- GWN_indexbuf_add_generic_vert(builder, v1);
- GWN_indexbuf_add_generic_vert(builder, v2);
- }
-
-void GWN_indexbuf_add_tri_verts(Gwn_IndexBufBuilder* builder, unsigned v1, unsigned v2, unsigned v3)
- {
-#if TRUST_NO_ONE
- assert(builder->prim_type == GWN_PRIM_TRIS);
- assert(v1 != v2 && v2 != v3 && v3 != v1);
-#endif
-
- GWN_indexbuf_add_generic_vert(builder, v1);
- GWN_indexbuf_add_generic_vert(builder, v2);
- GWN_indexbuf_add_generic_vert(builder, v3);
- }
-
-void GWN_indexbuf_add_line_adj_verts(Gwn_IndexBufBuilder* builder, unsigned v1, unsigned v2, unsigned v3, unsigned v4)
- {
-#if TRUST_NO_ONE
- assert(builder->prim_type == GWN_PRIM_LINES_ADJ);
- assert(v2 != v3); /* only the line need diff indices */
-#endif
-
- GWN_indexbuf_add_generic_vert(builder, v1);
- GWN_indexbuf_add_generic_vert(builder, v2);
- GWN_indexbuf_add_generic_vert(builder, v3);
- GWN_indexbuf_add_generic_vert(builder, v4);
- }
-
-#if GWN_TRACK_INDEX_RANGE
-// Everything remains 32 bit while building to keep things simple.
-// Find min/max after, then convert to smallest index type possible.
-
-static unsigned index_range(const unsigned values[], unsigned value_len, unsigned* min_out, unsigned* max_out)
- {
- if (value_len == 0)
- {
- *min_out = 0;
- *max_out = 0;
- return 0;
- }
- unsigned min_value = values[0];
- unsigned max_value = values[0];
- for (unsigned i = 1; i < value_len; ++i)
- {
- const unsigned value = values[i];
- if (value == GWN_PRIM_RESTART)
- continue;
- else if (value < min_value)
- min_value = value;
- else if (value > max_value)
- max_value = value;
- }
- *min_out = min_value;
- *max_out = max_value;
- return max_value - min_value;
- }
-
-static void squeeze_indices_byte(Gwn_IndexBufBuilder *builder, Gwn_IndexBuf* elem)
- {
- const unsigned *values = builder->data;
- const unsigned index_len = elem->index_len;
-
- // data will never be *larger* than builder->data...
- // converting in place to avoid extra allocation
- GLubyte *data = (GLubyte *)builder->data;
-
- if (elem->max_index > 0xFF)
- {
- const unsigned base = elem->min_index;
-
- elem->base_index = base;
- elem->min_index = 0;
- elem->max_index -= base;
-
- for (unsigned i = 0; i < index_len; ++i)
- data[i] = (values[i] == GWN_PRIM_RESTART) ? 0xFF : (GLubyte)(values[i] - base);
- }
- else
- {
- elem->base_index = 0;
-
- for (unsigned i = 0; i < index_len; ++i)
- data[i] = (GLubyte)(values[i]);
- }
- }
-
-static void squeeze_indices_short(Gwn_IndexBufBuilder *builder, Gwn_IndexBuf* elem)
- {
- const unsigned *values = builder->data;
- const unsigned index_len = elem->index_len;
-
- // data will never be *larger* than builder->data...
- // converting in place to avoid extra allocation
- GLushort *data = (GLushort *)builder->data;
-
- if (elem->max_index > 0xFFFF)
- {
- const unsigned base = elem->min_index;
-
- elem->base_index = base;
- elem->min_index = 0;
- elem->max_index -= base;
-
- for (unsigned i = 0; i < index_len; ++i)
- data[i] = (values[i] == GWN_PRIM_RESTART) ? 0xFFFF : (GLushort)(values[i] - base);
- }
- else
- {
- elem->base_index = 0;
-
- for (unsigned i = 0; i < index_len; ++i)
- data[i] = (GLushort)(values[i]);
- }
- }
-
-#endif // GWN_TRACK_INDEX_RANGE
-
-Gwn_IndexBuf* GWN_indexbuf_build(Gwn_IndexBufBuilder* builder)
- {
- Gwn_IndexBuf* elem = calloc(1, sizeof(Gwn_IndexBuf));
- GWN_indexbuf_build_in_place(builder, elem);
- return elem;
- }
-
-void GWN_indexbuf_build_in_place(Gwn_IndexBufBuilder* builder, Gwn_IndexBuf* elem)
- {
-#if TRUST_NO_ONE
- assert(builder->data != NULL);
-#endif
-
- elem->index_len = builder->index_len;
- elem->use_prim_restart = builder->use_prim_restart;
-
-#if GWN_TRACK_INDEX_RANGE
- unsigned range = index_range(builder->data, builder->index_len, &elem->min_index, &elem->max_index);
-
- // count the primitive restart index.
- if (elem->use_prim_restart)
- range += 1;
-
- if (range <= 0xFF)
- {
- elem->index_type = GWN_INDEX_U8;
- squeeze_indices_byte(builder, elem);
- }
- else if (range <= 0xFFFF)
- {
- elem->index_type = GWN_INDEX_U16;
- squeeze_indices_short(builder, elem);
- }
- else
- {
- elem->index_type = GWN_INDEX_U32;
- elem->base_index = 0;
- }
-
- elem->gl_index_type = convert_index_type_to_gl(elem->index_type);
-#endif
-
- if (elem->vbo_id == 0)
- elem->vbo_id = GWN_buf_id_alloc();
-
- // send data to GPU
- // GL_ELEMENT_ARRAY_BUFFER changes the state of the last VAO bound,
- // so we use the GL_ARRAY_BUFFER here to create a buffer without
- // interfering in the VAO state.
- glBindBuffer(GL_ARRAY_BUFFER, elem->vbo_id);
- glBufferData(GL_ARRAY_BUFFER, GWN_indexbuf_size_get(elem), builder->data, GL_STATIC_DRAW);
-
- // discard builder (one-time use)
- free(builder->data);
- builder->data = NULL;
- // other fields are safe to leave
- }
-
-void GWN_indexbuf_use(Gwn_IndexBuf* elem)
- {
- glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elem->vbo_id);
- }
-
-void GWN_indexbuf_discard(Gwn_IndexBuf* elem)
- {
- if (elem->vbo_id)
- GWN_buf_id_free(elem->vbo_id);
-
- free(elem);
- }
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