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gpu: Implement conic gradients

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This commit is contained in:
Benjamin Otte
2023-09-07 17:21:41 +02:00
parent 59ad96bc30
commit c34b2df412
4 changed files with 44 additions and 2 deletions
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24
gsk/gpu/gskgpunodeprocessor.c
View File

@@ -819,6 +819,26 @@ gsk_gpu_node_processor_create_radial_gradient_pattern (GskGpuNodeProcessor *self
return TRUE;
}
static gboolean
gsk_gpu_node_processor_create_conic_gradient_pattern (GskGpuNodeProcessor *self,
GskGpuBufferWriter *writer,
GskRenderNode *node,
GskGpuShaderImage *images,
gsize n_images,
gsize *out_n_images)
{
gsk_gpu_buffer_writer_append_uint (writer, GSK_GPU_PATTERN_CONIC_GRADIENT);
gsk_gpu_buffer_writer_append_point (writer,
gsk_conic_gradient_node_get_center (node),
&self->offset);
gsk_gpu_buffer_writer_append_float (writer, gsk_conic_gradient_node_get_angle (node));
gsk_gpu_buffer_writer_append_color_stops (writer,
gsk_conic_gradient_node_get_color_stops (node, NULL),
gsk_conic_gradient_node_get_n_color_stops (node));
return TRUE;
}
static gboolean
gsk_gpu_node_processor_create_glyph_pattern (GskGpuNodeProcessor *self,
GskGpuBufferWriter *writer,
@@ -1017,8 +1037,8 @@ static const struct
},
[GSK_CONIC_GRADIENT_NODE] = {
0,
NULL,
NULL,
gsk_gpu_node_processor_add_node_as_pattern,
gsk_gpu_node_processor_create_conic_gradient_pattern,
},
[GSK_BORDER_NODE] = {
0,

1
gsk/gpu/gskgputypesprivate.h
View File

@@ -38,5 +38,6 @@ typedef enum {
GSK_GPU_PATTERN_REPEATING_LINEAR_GRADIENT,
GSK_GPU_PATTERN_RADIAL_GRADIENT,
GSK_GPU_PATTERN_REPEATING_RADIAL_GRADIENT,
GSK_GPU_PATTERN_CONIC_GRADIENT,
} GskGpuPatternType;

1
gsk/gpu/shaders/enums.glsl
View File

@@ -15,5 +15,6 @@
#define GSK_GPU_PATTERN_REPEATING_LINEAR_GRADIENT 7u
#define GSK_GPU_PATTERN_RADIAL_GRADIENT 8u
#define GSK_GPU_PATTERN_REPEATING_RADIAL_GRADIENT 9u
#define GSK_GPU_PATTERN_CONIC_GRADIENT 10u
#endif

20
gsk/gpu/shaders/pattern.glsl
View File

@@ -165,6 +165,23 @@ radial_gradient_pattern (inout uint reader,
return gradient_get_color (gradient, offset - d_offset, offset + d_offset);
}
vec4
conic_gradient_pattern (inout uint reader,
vec2 pos)
{
vec2 center = read_vec2 (reader);
float angle = read_float (reader);
Gradient gradient = read_gradient (reader);
/* scaling modifies angles, so be sure to use right coordinate system */
pos = pos / push.scale - center;
float offset = atan (pos.y, pos.x);
offset = fract (degrees (offset + angle) / 360.0);
float d_offset = 0.5 * fwidth (offset);
return gradient_get_color (gradient, offset - d_offset, offset + d_offset);
}
vec4
color_pattern (inout uint reader)
{
@@ -214,6 +231,9 @@ pattern (uint reader,
case GSK_GPU_PATTERN_REPEATING_RADIAL_GRADIENT:
color = radial_gradient_pattern (reader, pos, true);
break;
case GSK_GPU_PATTERN_CONIC_GRADIENT:
color = conic_gradient_pattern (reader, pos);
break;
}
}
}