mutter/cogl/tests/conform/test-point-size-attribute.c

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Add support for per-vertex point sizes This adds a new function to enable per-vertex point size on a pipeline. This can be set with cogl_pipeline_set_per_vertex_point_size(). Once enabled the point size can be set either by drawing with an attribute named 'cogl_point_size_in' or by writing to the 'cogl_point_size_out' builtin from a snippet. There is a feature flag which must be checked for before using per-vertex point sizes. This will only be set on GL >= 2.0 or on GLES 2.0. GL will only let you set a per-vertex point size from GLSL by writing to gl_PointSize. This is only available in GL2 and not in the older GLSL extensions. The per-vertex point size has its own pipeline state flag so that it can be part of the state that affects vertex shader generation. Having to enable the per vertex point size with a separate function is a bit awkward. Ideally it would work like the color attribute where you can just set it for every vertex in your primitive with cogl_pipeline_set_color or set it per-vertex by just using the attribute. This is harder to get working with the point size because we need to generate a different vertex shader depending on what attributes are bound. I think if we wanted to make this work transparently we would still want to internally have a pipeline property describing whether the shader was generated with per-vertex support so that it would work with the shader cache correctly. Potentially we could make the per-vertex property internal and automatically make a weak pipeline whenever the attribute is bound. However we would then also need to automatically detect when an application is writing to cogl_point_size_out from a snippet. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 8495d9c1c15ce389885a9356d965eabd97758115) Conflicts: cogl/cogl-context.c cogl/cogl-pipeline-private.h cogl/cogl-pipeline.c cogl/cogl-private.h cogl/driver/gl/cogl-pipeline-progend-fixed.c cogl/driver/gl/gl/cogl-pipeline-progend-fixed-arbfp.c
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#include <cogl/cogl.h>
#include "test-utils.h"
/* This test assumes the GL driver supports point sizes up to 16
pixels. Cogl should probably have some way of querying the size so
we start from that instead */
#define MAX_POINT_SIZE 16
#define MIN_POINT_SIZE 4
#define N_POINTS (MAX_POINT_SIZE - MIN_POINT_SIZE + 1)
/* The size of the area that we'll paint each point in */
#define POINT_BOX_SIZE (MAX_POINT_SIZE * 2)
typedef struct
{
float x, y;
float point_size;
} PointVertex;
static int
calc_coord_offset (int pos, int pos_index, int point_size)
{
switch (pos_index)
{
case 0: return pos - point_size / 2 - 2;
case 1: return pos - point_size / 2 + 2;
case 2: return pos + point_size / 2 - 2;
case 3: return pos + point_size / 2 + 2;
}
g_assert_not_reached ();
}
static void
verify_point_size (CoglFramebuffer *test_fb,
int x_pos,
int y_pos,
int point_size)
{
int y, x;
for (y = 0; y < 4; y++)
for (x = 0; x < 4; x++)
{
CoglBool in_point = x >= 1 && x <= 2 && y >= 1 && y <= 2;
uint32_t expected_pixel = in_point ? 0x00ff00ff : 0xff0000ff;
test_utils_check_pixel (test_fb,
calc_coord_offset (x_pos, x, point_size),
calc_coord_offset (y_pos, y, point_size),
expected_pixel);
}
}
static CoglPrimitive *
create_primitive (const char *attribute_name)
{
PointVertex vertices[N_POINTS];
CoglAttributeBuffer *buffer;
CoglAttribute *attributes[2];
CoglPrimitive *prim;
int i;
for (i = 0; i < N_POINTS; i++)
{
vertices[i].x = i * POINT_BOX_SIZE + POINT_BOX_SIZE / 2;
vertices[i].y = POINT_BOX_SIZE / 2;
vertices[i].point_size = MAX_POINT_SIZE - i;
}
buffer = cogl_attribute_buffer_new (test_ctx,
sizeof (vertices),
vertices);
attributes[0] = cogl_attribute_new (buffer,
"cogl_position_in",
sizeof (PointVertex),
G_STRUCT_OFFSET (PointVertex, x),
2, /* n_components */
COGL_ATTRIBUTE_TYPE_FLOAT);
attributes[1] = cogl_attribute_new (buffer,
attribute_name,
sizeof (PointVertex),
G_STRUCT_OFFSET (PointVertex, point_size),
1, /* n_components */
COGL_ATTRIBUTE_TYPE_FLOAT);
prim = cogl_primitive_new_with_attributes (COGL_VERTICES_MODE_POINTS,
N_POINTS,
attributes,
2 /* n_attributes */);
for (i = 0; i < 2; i++)
cogl_object_unref (attributes[i]);
return prim;
}
static void
do_test (const char *attribute_name,
void (* pipeline_setup_func) (CoglPipeline *pipeline))
{
int fb_width = cogl_framebuffer_get_width (test_fb);
int fb_height = cogl_framebuffer_get_height (test_fb);
CoglPrimitive *primitive;
CoglPipeline *pipeline;
int i;
cogl_framebuffer_orthographic (test_fb,
0, 0, /* x_1, y_1 */
fb_width, /* x_2 */
fb_height /* y_2 */,
-1, 100 /* near/far */);
cogl_framebuffer_clear4f (test_fb,
COGL_BUFFER_BIT_COLOR,
1.0f, 0.0f, 0.0f, 1.0f);
primitive = create_primitive (attribute_name);
pipeline = cogl_pipeline_new (test_ctx);
cogl_pipeline_set_color4ub (pipeline, 0x00, 0xff, 0x00, 0xff);
cogl_pipeline_set_per_vertex_point_size (pipeline, TRUE, NULL);
if (pipeline_setup_func)
pipeline_setup_func (pipeline);
Add _primitive_draw to replace _framebuffer_draw_primitive When splitting out the CoglPath api we saw that we would be left with inconsistent drawing apis if the drawing apis in core Cogl were lumped into the cogl_framebuffer_ api considering other Cogl sub-libraries or that others will want to create higher level drawing apis outside of Cogl but can't use the same namespace. So that we can aim for a more consistent style this adds a cogl_primitive_draw() api, comparable to cogl_path_fill() or cogl_pango_show_layout() that's intended to replace cogl_framebuffer_draw_primitive() Note: the attribute and rectangle drawing apis are still in the cogl_framebuffer_ namespace and this might potentially change but in these cases there is no single object representing the thing being drawn so it seems a more reasonable they they live in the framebuffer namespace for now. Note: the cogl_framebuffer_draw_primitive() api isn't removed by this patch so it can more conveniently be cherry picked to the 1.16 branch so we can mark it deprecated for a short while. Even though it's marked as experimental api we know that there are people using the api so we'd like to give them a chance to switch to the new api. Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit 418912b93ff81a47f9b38114d05335ab76277c48) Conflicts: cogl-pango/cogl-pango-display-list.c cogl/Makefile.am cogl/cogl-framebuffer.c cogl/cogl-pipeline-layer-state.h cogl/cogl2-path.c cogl/driver/gl/cogl-clip-stack-gl.c
2013-07-09 18:47:29 -04:00
cogl_primitive_draw (primitive, test_fb, pipeline);
Add support for per-vertex point sizes This adds a new function to enable per-vertex point size on a pipeline. This can be set with cogl_pipeline_set_per_vertex_point_size(). Once enabled the point size can be set either by drawing with an attribute named 'cogl_point_size_in' or by writing to the 'cogl_point_size_out' builtin from a snippet. There is a feature flag which must be checked for before using per-vertex point sizes. This will only be set on GL >= 2.0 or on GLES 2.0. GL will only let you set a per-vertex point size from GLSL by writing to gl_PointSize. This is only available in GL2 and not in the older GLSL extensions. The per-vertex point size has its own pipeline state flag so that it can be part of the state that affects vertex shader generation. Having to enable the per vertex point size with a separate function is a bit awkward. Ideally it would work like the color attribute where you can just set it for every vertex in your primitive with cogl_pipeline_set_color or set it per-vertex by just using the attribute. This is harder to get working with the point size because we need to generate a different vertex shader depending on what attributes are bound. I think if we wanted to make this work transparently we would still want to internally have a pipeline property describing whether the shader was generated with per-vertex support so that it would work with the shader cache correctly. Potentially we could make the per-vertex property internal and automatically make a weak pipeline whenever the attribute is bound. However we would then also need to automatically detect when an application is writing to cogl_point_size_out from a snippet. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 8495d9c1c15ce389885a9356d965eabd97758115) Conflicts: cogl/cogl-context.c cogl/cogl-pipeline-private.h cogl/cogl-pipeline.c cogl/cogl-private.h cogl/driver/gl/cogl-pipeline-progend-fixed.c cogl/driver/gl/gl/cogl-pipeline-progend-fixed-arbfp.c
2012-11-08 11:56:02 -05:00
cogl_object_unref (pipeline);
cogl_object_unref (primitive);
/* Verify all of the points where drawn at the right size */
for (i = 0; i < N_POINTS; i++)
verify_point_size (test_fb,
i * POINT_BOX_SIZE + POINT_BOX_SIZE / 2, /* x */
POINT_BOX_SIZE / 2, /* y */
MAX_POINT_SIZE - i /* point size */);
if (cogl_test_verbose ())
g_print ("OK\n");
}
void
test_point_size_attribute (void)
{
do_test ("cogl_point_size_in", NULL);
}
static void
setup_snippet (CoglPipeline *pipeline)
{
CoglSnippet *snippet;
snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_POINT_SIZE,
"attribute float "
"my_super_duper_point_size_attrib;\n",
NULL);
cogl_snippet_set_replace (snippet,
"cogl_point_size_out = "
"my_super_duper_point_size_attrib;\n");
cogl_pipeline_add_snippet (pipeline, snippet);
cogl_object_unref (snippet);
}
void
test_point_size_attribute_snippet (void)
{
do_test ("my_super_duper_point_size_attrib", setup_snippet);
}