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debug: Adds a COGL_DEBUG=wireframe option
This adds a COGL_DEBUG=wireframe option to visualize the underlying geometry of the primitives being drawn via Cogl. This works for triangle list, triangle fan, triangle strip and quad (internal only) primitives. It also works for indexed vertex arrays.
This commit is contained in:
Robert Bragg
parent
20a1f87628
commit
460e4b90d3
@ -77,6 +77,11 @@ OPT (RECTANGLES,
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"rectangles",
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"Outline rectangles",
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"Add wire outlines for all rectangular geometry")
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OPT (WIREFRAME,
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"Visualize",
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"wireframe",
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"Show wireframes",
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"Add wire outlines for all geometry")
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OPT (DISABLE_BATCHING,
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"Root Cause",
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"disable-batching",
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@ -70,7 +70,8 @@ static const GDebugKey cogl_behavioural_debug_keys[] = {
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{ "disable-arbfp", COGL_DEBUG_DISABLE_ARBFP},
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{ "disable-glsl", COGL_DEBUG_DISABLE_GLSL},
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{ "disable-blending", COGL_DEBUG_DISABLE_BLENDING},
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{ "disable-npot-textures", COGL_DEBUG_DISABLE_NPOT_TEXTURES}
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{ "disable-npot-textures", COGL_DEBUG_DISABLE_NPOT_TEXTURES},
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{ "wireframe", COGL_DEBUG_WIREFRAME}
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};
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static const int n_cogl_behavioural_debug_keys =
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G_N_ELEMENTS (cogl_behavioural_debug_keys);
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@ -56,7 +56,8 @@ typedef enum {
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COGL_DEBUG_DISABLE_BLENDING = 1 << 23,
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COGL_DEBUG_TEXTURE_PIXMAP = 1 << 24,
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COGL_DEBUG_BITMAP = 1 << 25,
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COGL_DEBUG_DISABLE_NPOT_TEXTURES = 1 << 26
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COGL_DEBUG_DISABLE_NPOT_TEXTURES = 1 << 26,
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COGL_DEBUG_WIREFRAME = 1 << 27
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} CoglDebugFlags;
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#ifdef COGL_ENABLE_DEBUG
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@ -642,6 +642,239 @@ disable_gl_state (CoglVertexAttribute **attributes,
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}
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}
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#ifdef COGL_ENABLE_DEBUG
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static int
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get_index (void *indices,
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CoglIndicesType type,
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int _index)
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{
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if (!indices)
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return _index;
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switch (type)
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{
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case COGL_INDICES_TYPE_UNSIGNED_BYTE:
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return ((guint8 *)indices)[_index];
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case COGL_INDICES_TYPE_UNSIGNED_SHORT:
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return ((guint16 *)indices)[_index];
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case COGL_INDICES_TYPE_UNSIGNED_INT:
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return ((guint32 *)indices)[_index];
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}
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g_return_val_if_reached (0);
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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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CoglVertexAttribute *attribute,
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int start,
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int end,
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CoglP3Vertex *lines,
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int *n_line_vertices)
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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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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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}
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static CoglP3Vertex *
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get_wire_lines (CoglVertexAttribute *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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{
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CoglVertexArray *vertex_array = cogl_vertex_attribute_get_array (attribute);
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void *vertices;
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CoglIndexArray *index_array;
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void *indices;
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CoglIndicesType indices_type;
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int i;
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int n_lines;
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CoglP3Vertex *out;
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vertices = cogl_buffer_map (COGL_BUFFER (vertex_array),
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COGL_BUFFER_ACCESS_READ, 0);
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if (_indices)
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{
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index_array = cogl_indices_get_array (_indices);
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indices = cogl_buffer_map (COGL_BUFFER (index_array),
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COGL_BUFFER_ACCESS_READ, 0);
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indices_type = cogl_indices_get_type (_indices);
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}
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else
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indices = NULL;
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*n_vertices_out = 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 (CoglP3Vertex, 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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}
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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 (CoglP3Vertex, 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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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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}
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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 (CoglP3Vertex, 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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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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}
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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_in % 4) == 0)
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{
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n_lines = n_vertices_in;
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out = g_new (CoglP3Vertex, 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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}
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}
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#endif
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if (vertices)
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cogl_buffer_unmap (COGL_BUFFER (vertex_array));
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if (indices)
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cogl_buffer_unmap (COGL_BUFFER (index_array));
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return out;
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}
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static void
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draw_wireframe (CoglVerticesMode mode,
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int first_vertex,
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int n_vertices,
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CoglVertexAttribute **attributes,
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CoglIndices *indices)
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{
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CoglVertexAttribute *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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CoglVertexAttribute *wire_attribute[2];
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CoglP3Vertex *lines;
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CoglVertexArray *array;
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for (i = 0; attributes[i]; i++)
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{
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if (strcmp (attributes[i]->name, "cogl_position_in") == 0)
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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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mode,
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n_vertices,
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&n_line_vertices,
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indices);
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array = cogl_vertex_array_new (sizeof (CoglP3Vertex) * n_line_vertices,
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lines);
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wire_attribute[0] =
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cogl_vertex_attribute_new (array, "cogl_position_in",
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sizeof (CoglP3Vertex),
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0,
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3,
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COGL_VERTEX_ATTRIBUTE_TYPE_FLOAT);
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wire_attribute[1] = NULL;
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cogl_object_unref (array);
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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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}
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cogl_push_source (wire_pipeline);
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/* temporarily disable the wireframe to avoid recursion! */
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cogl_debug_flags &= ~COGL_DEBUG_WIREFRAME;
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_cogl_draw_vertex_attributes_array (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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cogl_debug_flags |= COGL_DEBUG_WIREFRAME;
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cogl_pop_source ();
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cogl_object_unref (wire_attribute[0]);
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}
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#endif
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static void
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_cogl_draw_vertex_attributes_array_real (CoglVerticesMode mode,
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int first_vertex,
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@ -656,6 +889,11 @@ _cogl_draw_vertex_attributes_array_real (CoglVerticesMode mode,
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/* FIXME: we shouldn't be disabling state after drawing we should
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* just disable the things not needed after enabling state. */
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disable_gl_state (attributes, source);
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#ifdef COGL_ENABLE_DEBUG
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if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_WIREFRAME))
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draw_wireframe (mode, first_vertex, n_vertices, attributes, NULL);
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#endif
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}
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/* This can be used by the CoglJournal to draw attributes skipping the
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@ -798,6 +1036,11 @@ _cogl_draw_indexed_vertex_attributes_array_real (CoglVerticesMode mode,
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/* FIXME: we shouldn't be disabling state after drawing we should
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* just disable the things not needed after enabling state. */
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disable_gl_state (attributes, source);
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#ifdef COGL_ENABLE_DEBUG
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if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_WIREFRAME))
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draw_wireframe (mode, first_vertex, n_vertices, attributes, indices);
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#endif
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}
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void
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