color management

include/render/gles2.h

@@ -33,6 +33,7 @@ struct wlr_gles2_pixel_format {
 };
 
 struct wlr_gles2_tex_shader {
+	// attribute locations
 	GLuint program;
 	GLint proj;
 	GLint invert_y;
@@ -40,6 +41,11 @@ struct wlr_gles2_tex_shader {
 	GLint alpha;
 	GLint pos_attrib;
 	GLint tex_attrib;
+	GLuint color_table;
+	GLint  color_enable;
+
+	// source components
+	const GLchar *head, *util, *main;
 };
 
 struct wlr_gles2_renderer {
@@ -110,4 +116,20 @@ void pop_gles2_marker(void);
 #define PUSH_GLES2_DEBUG push_gles2_marker(_WLR_FILENAME, __func__)
 #define POP_GLES2_DEBUG pop_gles2_marker()
 
+// color engine
+
+void color_engine_setup(void);
+GLuint color_build_lut(struct wlr_color_config *input, struct wlr_color_config *output);
+void color_convert(struct wlr_color_config *ic, struct wlr_color_config *oc, const float input[static 4], float output[static 4]);
+
+#define COLOR_LUT_SIZE 64
+
+/**
+ * Ignore half a texel near every edge because those
+ * areas are not interpolated. See GPU Gems 2, Ch. 24 for details.
+ *
+ * offset = (0.5 / COLOR_LUT_SIZE)
+ */
+#define COLOR_OFFSET "0.007813"
+
 #endif

include/wlr/render/color.h

@@ -0,0 +1,19 @@
+#ifndef _WLR_COLOR_H
+#define _WLR_COLOR_H
+
+struct wlr_color_config {
+    char *icc_profile_path; // not null
+};
+
+/**
+ * Create a color config.
+ *
+ * icc_profile_path should not be NULL.
+ * It will be copied into the config.
+ */
+struct wlr_color_config *wlr_color_config_load(const char *icc_profile_path);
+
+struct wlr_color_config *wlr_color_config_copy(struct wlr_color_config *value);
+void wlr_color_config_free(struct wlr_color_config *config);
+
+#endif

include/wlr/render/wlr_renderer.h

@@ -24,6 +24,7 @@ struct wlr_drm_format_set;
 
 struct wlr_renderer {
 	const struct wlr_renderer_impl *impl;
+	struct wlr_color_config *color;
 
 	bool rendering;
 

include/wlr/render/wlr_texture.h

@@ -12,12 +12,16 @@
 #include <stdint.h>
 #include <wayland-server-protocol.h>
 #include <wlr/render/dmabuf.h>
+#include <wlr/render/color.h>
 
 struct wlr_renderer;
 struct wlr_texture_impl;
 
 struct wlr_texture {
 	const struct wlr_texture_impl *impl;
+	struct wlr_color_config *color;
+	struct wlr_texture *colored;
+
 	uint32_t width, height;
 };
 

include/wlr/types/wlr_surface.h

@@ -128,6 +128,8 @@ struct wlr_surface {
 
 	struct wl_listener renderer_destroy;
 
+	struct wlr_color_config *color;
+
 	void *data;
 };