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https://github.com/brl/mutter.git
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debug: support wireframe mode with vertex shaders
Previously for the wireframe debug mode we identified the users "cogl_position_in" attribute, mapped that, created a replacement attribute with a LINE_LIST topology and then drew the attribute with a simple pipeline with a green colour. This meant we completely discarded the users original pipeline which may have involved vertex processing that would be useful to visualize in the wireframe. The new approach instead keeps the users attributes and instead generates CoglIndices that can be used to refererence the original attributes in LINE_LIST topology and instead of scrapping the user's pipeline we now create a weak copy of the original pipeline and just replace the fragment processing with a snippet to force the output color to be green. Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg
parent
1bba0f5d99
commit
80ccf06b84
@ -113,6 +113,8 @@ typedef struct _CoglFramebufferStackEntry
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extern CoglObjectClass _cogl_onscreen_class;
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static CoglUserDataKey wire_pipeline_key;
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static void _cogl_offscreen_free (CoglOffscreen *offscreen);
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COGL_OBJECT_DEFINE_WITH_CODE (Offscreen, offscreen,
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@ -2442,59 +2444,75 @@ get_index (void *indices,
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}
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static void
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add_line (void *vertices,
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void *indices,
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CoglIndicesType indices_type,
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CoglAttribute *attribute,
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int start,
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int end,
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CoglVertexP3 *lines,
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int *n_line_vertices)
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add_line (guint32 *line_indices,
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int base,
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void *user_indices,
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CoglIndicesType user_indices_type,
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int index0,
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int index1,
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int *pos)
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{
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int start_index = get_index (indices, indices_type, start);
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int end_index = get_index (indices, indices_type, end);
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float *v0 = (float *)((guint8 *)vertices + start_index * attribute->stride);
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float *v1 = (float *)((guint8 *)vertices + end_index * attribute->stride);
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float *o = (float *)(&lines[*n_line_vertices]);
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int i;
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index0 = get_index (user_indices, user_indices_type, index0);
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index1 = get_index (user_indices, user_indices_type, index1);
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for (i = 0; i < attribute->n_components; i++)
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*(o++) = *(v0++);
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for (;i < 3; i++)
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*(o++) = 0;
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for (i = 0; i < attribute->n_components; i++)
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*(o++) = *(v1++);
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for (;i < 3; i++)
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*(o++) = 0;
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*n_line_vertices += 2;
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line_indices[(*pos)++] = base + index0;
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line_indices[(*pos)++] = base + index1;
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}
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static CoglVertexP3 *
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get_wire_lines (CoglAttribute *attribute,
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CoglVerticesMode mode,
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int n_vertices_in,
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int *n_vertices_out,
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CoglIndices *_indices)
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static int
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get_line_count (CoglVerticesMode mode, int n_vertices)
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{
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CoglAttributeBuffer *attribute_buffer = cogl_attribute_get_buffer (attribute);
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void *vertices;
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if (mode == COGL_VERTICES_MODE_TRIANGLES &&
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(n_vertices % 3) == 0)
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{
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return n_vertices;
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}
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else if (mode == COGL_VERTICES_MODE_TRIANGLE_FAN &&
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n_vertices >= 3)
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{
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return 2 * n_vertices - 3;
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}
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else if (mode == COGL_VERTICES_MODE_TRIANGLE_STRIP &&
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n_vertices >= 3)
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{
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return 2 * n_vertices - 3;
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}
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/* In the journal we are a bit sneaky and actually use GL_QUADS
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* which isn't actually a valid CoglVerticesMode! */
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#ifdef HAVE_COGL_GL
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else if (mode == GL_QUADS && (n_vertices % 4) == 0)
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{
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return n_vertices;
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}
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#endif
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g_return_val_if_reached (0);
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}
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static CoglIndices *
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get_wire_line_indices (CoglContext *ctx,
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CoglVerticesMode mode,
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int first_vertex,
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int n_vertices_in,
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CoglIndices *user_indices,
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int *n_indices)
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{
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int n_lines;
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guint32 *line_indices;
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CoglIndexBuffer *index_buffer;
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void *indices;
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CoglIndicesType indices_type;
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int base = first_vertex;
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int pos;
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int i;
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int n_lines;
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CoglVertexP3 *out = NULL;
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CoglIndices *ret;
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vertices = cogl_buffer_map (COGL_BUFFER (attribute_buffer),
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COGL_BUFFER_ACCESS_READ, 0);
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if (_indices)
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if (user_indices)
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{
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index_buffer = cogl_indices_get_buffer (_indices);
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index_buffer = cogl_indices_get_buffer (user_indices);
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indices = cogl_buffer_map (COGL_BUFFER (index_buffer),
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COGL_BUFFER_ACCESS_READ, 0);
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indices_type = cogl_indices_get_type (_indices);
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indices_type = cogl_indices_get_type (user_indices);
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}
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else
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{
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@ -2503,63 +2521,47 @@ get_wire_lines (CoglAttribute *attribute,
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indices_type = COGL_INDICES_TYPE_UNSIGNED_BYTE;
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}
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*n_vertices_out = 0;
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n_lines = get_line_count (mode, n_vertices_in);
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/* Note: we are using COGL_INDICES_TYPE_UNSIGNED_INT so 4 bytes per index. */
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line_indices = g_malloc (4 * n_lines * 2);
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pos = 0;
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if (mode == COGL_VERTICES_MODE_TRIANGLES &&
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(n_vertices_in % 3) == 0)
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{
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n_lines = n_vertices_in;
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out = g_new (CoglVertexP3, n_lines * 2);
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for (i = 0; i < n_vertices_in; i += 3)
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{
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add_line (vertices, indices, indices_type, attribute,
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i, i+1, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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i+1, i+2, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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i+2, i, out, n_vertices_out);
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add_line (line_indices, base, indices, indices_type, i, i+1, &pos);
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add_line (line_indices, base, indices, indices_type, i+1, i+2, &pos);
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add_line (line_indices, base, indices, indices_type, i+2, i, &pos);
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}
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}
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else if (mode == COGL_VERTICES_MODE_TRIANGLE_FAN &&
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n_vertices_in >= 3)
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{
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n_lines = 2 * n_vertices_in - 3;
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out = g_new (CoglVertexP3, n_lines * 2);
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add_line (vertices, indices, indices_type, attribute,
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0, 1, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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1, 2, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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0, 2, out, n_vertices_out);
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add_line (line_indices, base, indices, indices_type, 0, 1, &pos);
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add_line (line_indices, base, indices, indices_type, 1, 2, &pos);
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add_line (line_indices, base, indices, indices_type, 0, 2, &pos);
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for (i = 3; i < n_vertices_in; i++)
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{
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add_line (vertices, indices, indices_type, attribute,
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i - 1, i, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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0, i, out, n_vertices_out);
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add_line (line_indices, base, indices, indices_type, i - 1, i, &pos);
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add_line (line_indices, base, indices, indices_type, 0, i, &pos);
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}
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}
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else if (mode == COGL_VERTICES_MODE_TRIANGLE_STRIP &&
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n_vertices_in >= 3)
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{
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n_lines = 2 * n_vertices_in - 3;
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out = g_new (CoglVertexP3, n_lines * 2);
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add_line (vertices, indices, indices_type, attribute,
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0, 1, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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1, 2, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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0, 2, out, n_vertices_out);
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add_line (line_indices, base, indices, indices_type, 0, 1, &pos);
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add_line (line_indices, base, indices, indices_type, 1, 2, &pos);
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add_line (line_indices, base, indices, indices_type, 0, 2, &pos);
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for (i = 3; i < n_vertices_in; i++)
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{
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add_line (vertices, indices, indices_type, attribute,
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i - 1, i, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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i - 2, i, out, n_vertices_out);
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add_line (line_indices, base, indices, indices_type, i - 1, i, &pos);
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add_line (line_indices, base, indices, indices_type, i - 2, i, &pos);
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}
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}
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/* In the journal we are a bit sneaky and actually use GL_QUADS
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@ -2567,34 +2569,70 @@ get_wire_lines (CoglAttribute *attribute,
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#ifdef HAVE_COGL_GL
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else if (mode == GL_QUADS && (n_vertices_in % 4) == 0)
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{
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n_lines = n_vertices_in;
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out = g_new (CoglVertexP3, n_lines * 2);
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for (i = 0; i < n_vertices_in; i += 4)
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{
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add_line (vertices, indices, indices_type, attribute,
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i, i + 1, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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i + 1, i + 2, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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i + 2, i + 3, out, n_vertices_out);
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add_line (vertices, indices, indices_type, attribute,
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i + 3, i, out, n_vertices_out);
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add_line (line_indices,
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base, indices, indices_type, i, i + 1, &pos);
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add_line (line_indices,
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base, indices, indices_type, i + 1, i + 2, &pos);
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add_line (line_indices,
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base, indices, indices_type, i + 2, i + 3, &pos);
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add_line (line_indices,
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base, indices, indices_type, i + 3, i, &pos);
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}
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}
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#endif
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if (vertices != NULL)
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cogl_buffer_unmap (COGL_BUFFER (attribute_buffer));
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if (indices != NULL)
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if (user_indices)
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cogl_buffer_unmap (COGL_BUFFER (index_buffer));
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return out;
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*n_indices = n_lines * 2;
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ret = cogl_indices_new (ctx,
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COGL_INDICES_TYPE_UNSIGNED_INT,
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line_indices,
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*n_indices);
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g_free (line_indices);
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return ret;
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}
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static gboolean
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remove_layer_cb (CoglPipeline *pipeline,
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int layer_index,
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void *user_data)
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{
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cogl_pipeline_remove_layer (pipeline, layer_index);
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return TRUE;
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}
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static void
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draw_wireframe (CoglFramebuffer *framebuffer,
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pipeline_destroyed_cb (CoglPipeline *weak_pipeline, void *user_data)
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{
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CoglPipeline *original_pipeline = user_data;
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/* XXX: I think we probably need to provide a custom unref function for
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* CoglPipeline because it's possible that we will reach this callback
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* because original_pipeline is being freed which means cogl_object_unref
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* will have already freed any associated user data.
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*
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* Setting more user data here will *probably* succeed but that may allocate
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* a new user-data array which could be leaked.
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*
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* Potentially we could have a _cogl_object_free_user_data function so
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* that a custom unref function could be written that can destroy weak
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* pipeline children before removing user data.
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*/
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cogl_object_set_user_data (COGL_OBJECT (original_pipeline),
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&wire_pipeline_key, NULL, NULL);
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cogl_object_unref (weak_pipeline);
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}
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static void
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draw_wireframe (CoglContext *ctx,
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CoglFramebuffer *framebuffer,
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CoglPipeline *pipeline,
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CoglVerticesMode mode,
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int first_vertex,
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@ -2603,68 +2641,70 @@ draw_wireframe (CoglFramebuffer *framebuffer,
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int n_attributes,
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CoglIndices *indices)
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{
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CoglAttribute *position = NULL;
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int i;
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int n_line_vertices;
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static CoglPipeline *wire_pipeline;
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CoglAttribute *wire_attribute[1];
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CoglVertexP3 *lines;
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CoglAttributeBuffer *attribute_buffer;
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CoglIndices *wire_indices;
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CoglPipeline *wire_pipeline;
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int n_indices;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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for (i = 0; i < n_attributes; i++)
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{
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if (attributes[i]->name_state->name_id ==
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COGL_ATTRIBUTE_NAME_ID_POSITION_ARRAY)
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{
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position = attributes[i];
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break;
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}
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}
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if (!position)
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return;
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lines = get_wire_lines (position,
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wire_indices = get_wire_line_indices (ctx,
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mode,
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first_vertex,
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n_vertices,
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&n_line_vertices,
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indices);
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attribute_buffer =
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cogl_attribute_buffer_new (ctx, sizeof (CoglVertexP3) * n_line_vertices,
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lines);
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wire_attribute[0] =
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cogl_attribute_new (attribute_buffer, "cogl_position_in",
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sizeof (CoglVertexP3),
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0,
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3,
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COGL_ATTRIBUTE_TYPE_FLOAT);
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cogl_object_unref (attribute_buffer);
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indices,
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&n_indices);
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wire_pipeline = cogl_object_get_user_data (COGL_OBJECT (pipeline),
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&wire_pipeline_key);
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if (!wire_pipeline)
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{
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wire_pipeline = cogl_pipeline_new ();
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cogl_pipeline_set_color4ub (wire_pipeline,
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0x00, 0xff, 0x00, 0xff);
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wire_pipeline =
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_cogl_pipeline_weak_copy (pipeline, pipeline_destroyed_cb, NULL);
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cogl_object_set_user_data (COGL_OBJECT (pipeline),
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&wire_pipeline_key, wire_pipeline,
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NULL);
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/* If we have glsl then the pipeline may have an associated
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* vertex program and since we'd like to see the results of the
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* vertex program in the wireframe we just add a final clobber
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* of the wire color leaving the rest of the state untouched. */
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if (cogl_has_feature (framebuffer->context, COGL_FEATURE_ID_GLSL))
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{
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CoglSnippet *snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
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NULL,
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NULL);
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cogl_snippet_set_replace (snippet,
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"cogl_color_out = "
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"vec4 (0.0, 1.0, 0.0, 1.0);\n");
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cogl_pipeline_add_snippet (wire_pipeline, snippet);
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cogl_object_unref (snippet);
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}
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else
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{
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cogl_pipeline_foreach_layer (wire_pipeline, remove_layer_cb, NULL);
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cogl_pipeline_set_color4f (wire_pipeline, 0, 1, 0, 1);
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}
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}
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/* temporarily disable the wireframe to avoid recursion! */
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COGL_DEBUG_CLEAR_FLAG (COGL_DEBUG_WIREFRAME);
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_cogl_framebuffer_draw_attributes (framebuffer,
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_cogl_framebuffer_draw_indexed_attributes (
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framebuffer,
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wire_pipeline,
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COGL_VERTICES_MODE_LINES,
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0,
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n_line_vertices,
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wire_attribute,
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1,
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n_indices,
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wire_indices,
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attributes,
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n_attributes,
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COGL_DRAW_SKIP_JOURNAL_FLUSH |
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COGL_DRAW_SKIP_PIPELINE_VALIDATION |
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COGL_DRAW_SKIP_FRAMEBUFFER_FLUSH |
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COGL_DRAW_SKIP_LEGACY_STATE);
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COGL_DEBUG_SET_FLAG (COGL_DEBUG_WIREFRAME);
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cogl_object_unref (wire_attribute[0]);
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cogl_object_unref (wire_indices);
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}
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#endif
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@ -2683,7 +2723,8 @@ _cogl_framebuffer_draw_attributes (CoglFramebuffer *framebuffer,
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{
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#ifdef COGL_ENABLE_DEBUG
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if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_WIREFRAME)))
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draw_wireframe (framebuffer, pipeline,
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draw_wireframe (framebuffer->context,
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framebuffer, pipeline,
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mode, first_vertex, n_vertices,
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attributes, n_attributes, NULL);
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else
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@ -2776,7 +2817,8 @@ _cogl_framebuffer_draw_indexed_attributes (CoglFramebuffer *framebuffer,
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{
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#ifdef COGL_ENABLE_DEBUG
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if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_WIREFRAME)))
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draw_wireframe (framebuffer, pipeline,
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draw_wireframe (framebuffer->context,
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framebuffer, pipeline,
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mode, first_vertex, n_vertices,
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attributes, n_attributes, indices);
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else
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