int
main (int argc, char **argv)
{
CoglContext *ctx;
CoglOnscreen *onscreen;
CoglFramebuffer *fb;
GError *error = NULL;
Data data;
PangoRectangle hello_label_size;
float fovy, aspect, z_near, z_2d, z_far;
CoglDepthState depth_state;
CoglBool has_swap_notify;
ctx = cogl_context_new (NULL, &error);
if (!ctx) {
fprintf (stderr, "Failed to create context: %s\n", error->message);
return 1;
}
onscreen = cogl_onscreen_new (ctx, 640, 480);
fb = COGL_FRAMEBUFFER (onscreen);
data.fb = fb;
data.framebuffer_width = cogl_framebuffer_get_width (fb);
data.framebuffer_height = cogl_framebuffer_get_height (fb);
data.timer = g_timer_new ();
cogl_onscreen_show (onscreen);
cogl_framebuffer_set_viewport (fb,
0, 0,
data.framebuffer_width,
data.framebuffer_height);
fovy = 60; /* y-axis field of view */
aspect = (float)data.framebuffer_width/(float)data.framebuffer_height;
z_near = 0.1; /* distance to near clipping plane */
z_2d = 1000; /* position to 2d plane */
z_far = 2000; /* distance to far clipping plane */
cogl_framebuffer_perspective (fb, fovy, aspect, z_near, z_far);
/* Since the pango renderer emits geometry in pixel/device coordinates
* and the anti aliasing is implemented with the assumption that the
* geometry *really* does end up pixel aligned, we setup a modelview
* matrix so that for geometry in the plane z = 0 we exactly map x
* coordinates in the range [0,stage_width] and y coordinates in the
* range [0,stage_height] to the framebuffer extents with (0,0) being
* the top left.
*
* This is roughly what Clutter does for a ClutterStage, but this
* demonstrates how it is done manually using Cogl.
*/
cogl_matrix_init_identity (&data.view);
cogl_matrix_view_2d_in_perspective (&data.view, fovy, aspect, z_near, z_2d,
data.framebuffer_width,
data.framebuffer_height);
cogl_framebuffer_set_modelview_matrix (fb, &data.view);
/* Initialize some convenient constants */
cogl_matrix_init_identity (&identity);
cogl_color_set_from_4ub (&white, 0xff, 0xff, 0xff, 0xff);
/* rectangle indices allow the GPU to interpret a list of quads (the
* faces of our cube) as a list of triangles.
*
* Since this is a very common thing to do
* cogl_get_rectangle_indices() is a convenience function for
* accessing internal index buffers that can be shared.
*/
data.indices = cogl_get_rectangle_indices (ctx, 6 /* n_rectangles */);
data.prim = cogl_primitive_new_p3t2 (ctx, COGL_VERTICES_MODE_TRIANGLES,
G_N_ELEMENTS (vertices),
vertices);
/* Each face will have 6 indices so we have 6 * 6 indices in total... */
cogl_primitive_set_indices (data.prim,
data.indices,
6 * 6);
/* Load a jpeg crate texture from a file */
printf ("crate.jpg (CC by-nc-nd http://bit.ly/9kP45T) ShadowRunner27 http://bit.ly/m1YXLh\n");
data.texture = cogl_texture_new_from_file (COGL_EXAMPLES_DATA "crate.jpg",
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_ANY,
&error);
if (!data.texture)
g_error ("Failed to load texture: %s", error->message);
/* a CoglPipeline conceptually describes all the state for vertex
* processing, fragment processing and blending geometry. When
* drawing the geometry for the crate this pipeline says to sample a
* single texture during fragment processing... */
data.crate_pipeline = cogl_pipeline_new (ctx);
cogl_pipeline_set_layer_texture (data.crate_pipeline, 0, data.texture);
/* Since the box is made of multiple triangles that will overlap
* when drawn and we don't control the order they are drawn in, we
* enable depth testing to make sure that triangles that shouldn't
* be visible get culled by the GPU. */
cogl_depth_state_init (&depth_state);
cogl_depth_state_set_test_enabled (&depth_state, TRUE);
cogl_pipeline_set_depth_state (data.crate_pipeline, &depth_state, NULL);
/* Setup a Pango font map and context */
data.pango_font_map = COGL_PANGO_FONT_MAP (cogl_pango_font_map_new (ctx));
cogl_pango_font_map_set_use_mipmapping (data.pango_font_map, TRUE);
data.pango_context =
pango_font_map_create_context (PANGO_FONT_MAP (data.pango_font_map));
data.pango_font_desc = pango_font_description_new ();
pango_font_description_set_family (data.pango_font_desc, "Sans");
pango_font_description_set_size (data.pango_font_desc, 30 * PANGO_SCALE);
/* Setup the "Hello Cogl" text */
data.hello_label = pango_layout_new (data.pango_context);
pango_layout_set_font_description (data.hello_label, data.pango_font_desc);
pango_layout_set_text (data.hello_label, "Hello Cogl", -1);
pango_layout_get_extents (data.hello_label, NULL, &hello_label_size);
data.hello_label_width = PANGO_PIXELS (hello_label_size.width);
data.hello_label_height = PANGO_PIXELS (hello_label_size.height);
data.swap_ready = TRUE;
has_swap_notify =
cogl_has_feature (ctx, COGL_FEATURE_ID_SWAP_BUFFERS_EVENT);
if (has_swap_notify)
cogl_onscreen_add_swap_buffers_callback (COGL_ONSCREEN (fb),
swap_notify_cb,
&data);
while (1)
{
CoglPollFD *poll_fds;
int n_poll_fds;
int64_t timeout;
if (data.swap_ready)
{
paint (&data);
cogl_onscreen_swap_buffers (COGL_ONSCREEN (fb));
}
cogl_poll_get_info (ctx, &poll_fds, &n_poll_fds, &timeout);
if (!has_swap_notify)
{
/* If the winsys doesn't support swap event notification
then we'll just redraw constantly */
data.swap_ready = TRUE;
timeout = 0;
}
g_poll ((GPollFD *) poll_fds, n_poll_fds,
timeout == -1 ? -1 : timeout / 1000);
cogl_poll_dispatch (ctx, poll_fds, n_poll_fds);
}
return 0;
}
static void
emit_vertex_buffer_geometry (CoglFramebuffer *fb,
CoglPipeline *pipeline,
CoglPangoDisplayListNode *node)
{
CoglContext *ctx = fb->context;
/* It's expensive to go through the Cogl journal for large runs
* of text in part because the journal transforms the quads in software
* to avoid changing the modelview matrix. So for larger runs of text
* we load the vertices into a VBO, and this has the added advantage
* that if the text doesn't change from frame to frame the VBO can
* be re-used avoiding the repeated cost of validating the data and
* mapping it into the GPU... */
if (node->d.texture.primitive == NULL)
{
CoglAttributeBuffer *buffer;
CoglVertexP2T2 *verts, *v;
int n_verts;
CoglBool allocated = FALSE;
CoglAttribute *attributes[2];
CoglPrimitive *prim;
int i;
CoglError *ignore_error = NULL;
n_verts = node->d.texture.rectangles->len * 4;
buffer
= cogl_attribute_buffer_new_with_size (ctx,
n_verts *
sizeof (CoglVertexP2T2));
if ((verts = cogl_buffer_map (COGL_BUFFER (buffer),
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD,
&ignore_error)) == NULL)
{
cogl_error_free (ignore_error);
verts = g_new (CoglVertexP2T2, n_verts);
allocated = TRUE;
}
v = verts;
/* Copy the rectangles into the buffer and expand into four
vertices instead of just two */
for (i = 0; i < node->d.texture.rectangles->len; i++)
{
const CoglPangoDisplayListRectangle *rectangle
= &g_array_index (node->d.texture.rectangles,
CoglPangoDisplayListRectangle, i);
v->x = rectangle->x_1;
v->y = rectangle->y_1;
v->s = rectangle->s_1;
v->t = rectangle->t_1;
v++;
v->x = rectangle->x_1;
v->y = rectangle->y_2;
v->s = rectangle->s_1;
v->t = rectangle->t_2;
v++;
v->x = rectangle->x_2;
v->y = rectangle->y_2;
v->s = rectangle->s_2;
v->t = rectangle->t_2;
v++;
v->x = rectangle->x_2;
v->y = rectangle->y_1;
v->s = rectangle->s_2;
v->t = rectangle->t_1;
v++;
}
if (allocated)
{
cogl_buffer_set_data (COGL_BUFFER (buffer),
0, /* offset */
verts,
sizeof (CoglVertexP2T2) * n_verts,
NULL);
g_free (verts);
}
else
cogl_buffer_unmap (COGL_BUFFER (buffer));
attributes[0] = cogl_attribute_new (buffer,
"cogl_position_in",
sizeof (CoglVertexP2T2),
G_STRUCT_OFFSET (CoglVertexP2T2, x),
2, /* n_components */
COGL_ATTRIBUTE_TYPE_FLOAT);
attributes[1] = cogl_attribute_new (buffer,
"cogl_tex_coord0_in",
sizeof (CoglVertexP2T2),
G_STRUCT_OFFSET (CoglVertexP2T2, s),
2, /* n_components */
COGL_ATTRIBUTE_TYPE_FLOAT);
prim = cogl_primitive_new_with_attributes (COGL_VERTICES_MODE_TRIANGLES,
n_verts,
attributes,
2 /* n_attributes */);
#ifdef CLUTTER_COGL_HAS_GL
if (_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_QUADS))
cogl_primitive_set_mode (prim, GL_QUADS);
else
#endif
{
/* GLES doesn't support GL_QUADS so instead we use a VBO
with indexed vertices to generate GL_TRIANGLES from the
quads */
CoglIndices *indices =
cogl_get_rectangle_indices (ctx, node->d.texture.rectangles->len);
cogl_primitive_set_indices (prim, indices,
node->d.texture.rectangles->len * 6);
}
node->d.texture.primitive = prim;
cogl_object_unref (buffer);
cogl_object_unref (attributes[0]);
cogl_object_unref (attributes[1]);
}
cogl_primitive_draw (node->d.texture.primitive,
fb,
pipeline);
}
static void
draw_frame (TestState *state)
{
CoglTexture *tex = create_texture_3d (test_ctx);
CoglPipeline *pipeline = cogl_pipeline_new (test_ctx);
typedef struct { float x, y, s, t, r; } Vert;
CoglPrimitive *primitive;
CoglAttributeBuffer *attribute_buffer;
CoglAttribute *attributes[2];
Vert *verts, *v;
int i;
cogl_pipeline_set_layer_texture (pipeline, 0, tex);
cogl_object_unref (tex);
cogl_pipeline_set_layer_filters (pipeline, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
/* Render the texture repeated horizontally twice using a regular
cogl rectangle. This should end up with the r texture coordinates
as zero */
cogl_framebuffer_draw_textured_rectangle (test_fb, pipeline,
0.0f, 0.0f, TEX_WIDTH * 2, TEX_HEIGHT,
0.0f, 0.0f, 2.0f, 1.0f);
/* Render all of the images in the texture using coordinates from a
CoglPrimitive */
v = verts = g_new (Vert, 4 * TEX_DEPTH);
for (i = 0; i < TEX_DEPTH; i++)
{
float r = (i + 0.5f) / TEX_DEPTH;
v->x = i * TEX_WIDTH;
v->y = TEX_HEIGHT;
v->s = 0;
v->t = 0;
v->r = r;
v++;
v->x = i * TEX_WIDTH;
v->y = TEX_HEIGHT * 2;
v->s = 0;
v->t = 1;
v->r = r;
v++;
v->x = i * TEX_WIDTH + TEX_WIDTH;
v->y = TEX_HEIGHT * 2;
v->s = 1;
v->t = 1;
v->r = r;
v++;
v->x = i * TEX_WIDTH + TEX_WIDTH;
v->y = TEX_HEIGHT;
v->s = 1;
v->t = 0;
v->r = r;
v++;
}
attribute_buffer = cogl_attribute_buffer_new (test_ctx,
4 * TEX_DEPTH * sizeof (Vert),
verts);
attributes[0] = cogl_attribute_new (attribute_buffer,
"cogl_position_in",
sizeof (Vert),
G_STRUCT_OFFSET (Vert, x),
2, /* n_components */
COGL_ATTRIBUTE_TYPE_FLOAT);
attributes[1] = cogl_attribute_new (attribute_buffer,
"cogl_tex_coord_in",
sizeof (Vert),
G_STRUCT_OFFSET (Vert, s),
3, /* n_components */
COGL_ATTRIBUTE_TYPE_FLOAT);
primitive = cogl_primitive_new_with_attributes (COGL_VERTICES_MODE_TRIANGLES,
6 * TEX_DEPTH,
attributes,
2 /* n_attributes */);
cogl_primitive_set_indices (primitive,
cogl_get_rectangle_indices (test_ctx,
TEX_DEPTH),
6 * TEX_DEPTH);
cogl_primitive_draw (primitive, test_fb, pipeline);
g_free (verts);
cogl_object_unref (primitive);
cogl_object_unref (attributes[0]);
cogl_object_unref (attributes[1]);
cogl_object_unref (attribute_buffer);
cogl_object_unref (pipeline);
}
