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ebb7fdb099
The alternative color state is used as the interpolation color state. Colors are transformed into that space on the CPU. For now we set the interpolation color state to SRGB, because ultimately we want to let callers specify it, so having something that's easy to map to that behavior is desirable. Otherwise we might have chosen to interpolate in the compositing colorstate. It also means that we need to premultiply colors on the CPU now because of the limitations of the shader colorstates APIs.
100 lines
3.9 KiB
C
100 lines
3.9 KiB
C
#include "config.h"
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#include "gskgpulineargradientopprivate.h"
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#include "gskgpuframeprivate.h"
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#include "gskgpuprintprivate.h"
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#include "gskrectprivate.h"
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#include "gpu/shaders/gskgpulineargradientinstance.h"
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#define VARIATION_SUPERSAMPLING (1 << 0)
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#define VARIATION_REPEATING (1 << 1)
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typedef struct _GskGpuLinearGradientOp GskGpuLinearGradientOp;
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struct _GskGpuLinearGradientOp
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{
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GskGpuShaderOp op;
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};
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static void
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gsk_gpu_linear_gradient_op_print_instance (GskGpuShaderOp *shader,
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gpointer instance_,
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GString *string)
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{
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GskGpuLineargradientInstance *instance = (GskGpuLineargradientInstance *) instance_;
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if (shader->variation & VARIATION_REPEATING)
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gsk_gpu_print_string (string, "repeating");
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gsk_gpu_print_rect (string, instance->rect);
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}
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static const GskGpuShaderOpClass GSK_GPU_LINEAR_GRADIENT_OP_CLASS = {
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{
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GSK_GPU_OP_SIZE (GskGpuLinearGradientOp),
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GSK_GPU_STAGE_SHADER,
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gsk_gpu_shader_op_finish,
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gsk_gpu_shader_op_print,
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#ifdef GDK_RENDERING_VULKAN
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gsk_gpu_shader_op_vk_command,
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#endif
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gsk_gpu_shader_op_gl_command
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},
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"gskgpulineargradient",
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sizeof (GskGpuLineargradientInstance),
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#ifdef GDK_RENDERING_VULKAN
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&gsk_gpu_lineargradient_info,
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#endif
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gsk_gpu_linear_gradient_op_print_instance,
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gsk_gpu_lineargradient_setup_attrib_locations,
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gsk_gpu_lineargradient_setup_vao
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};
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void
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gsk_gpu_linear_gradient_op (GskGpuFrame *frame,
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GskGpuShaderClip clip,
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GskGpuColorStates color_states,
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gboolean repeating,
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const graphene_rect_t *rect,
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const graphene_point_t *start,
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const graphene_point_t *end,
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const graphene_point_t *offset,
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const GskColorStop *stops,
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gsize n_stops)
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{
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GskGpuLineargradientInstance *instance;
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GdkColorState *color_state = gsk_gpu_color_states_get_alt (color_states);
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g_assert (n_stops > 1);
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g_assert (n_stops <= 7);
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g_assert (gsk_gpu_color_states_is_alt_premultiplied (color_states));
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gsk_gpu_shader_op_alloc (frame,
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&GSK_GPU_LINEAR_GRADIENT_OP_CLASS,
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color_states,
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(repeating ? VARIATION_REPEATING : 0) |
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(gsk_gpu_frame_should_optimize (frame, GSK_GPU_OPTIMIZE_GRADIENTS) ? VARIATION_SUPERSAMPLING : 0),
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clip,
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NULL,
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&instance);
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gsk_gpu_rect_to_float (rect, offset, instance->rect);
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gsk_gpu_point_to_float (start, offset, instance->startend);
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gsk_gpu_point_to_float (end, offset, &instance->startend[2]);
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gdk_color_state_from_rgba (color_state, &stops[MIN (n_stops - 1, 6)].color, instance->color6);
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instance->offsets1[2] = stops[MIN (n_stops - 1, 6)].offset;
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gdk_color_state_from_rgba (color_state, &stops[MIN (n_stops - 1, 5)].color, instance->color5);
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instance->offsets1[1] = stops[MIN (n_stops - 1, 5)].offset;
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gdk_color_state_from_rgba (color_state, &stops[MIN (n_stops - 1, 4)].color, instance->color4);
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instance->offsets1[0] = stops[MIN (n_stops - 1, 4)].offset;
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gdk_color_state_from_rgba (color_state, &stops[MIN (n_stops - 1, 3)].color, instance->color3);
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instance->offsets0[3] = stops[MIN (n_stops - 1, 3)].offset;
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gdk_color_state_from_rgba (color_state, &stops[MIN (n_stops - 1, 2)].color, instance->color2);
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instance->offsets0[2] = stops[MIN (n_stops - 1, 2)].offset;
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gdk_color_state_from_rgba (color_state, &stops[1].color, instance->color1);
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instance->offsets0[1] = stops[1].offset;
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gdk_color_state_from_rgba (color_state, &stops[0].color, instance->color0);
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instance->offsets0[0] = stops[0].offset;
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}
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