[renderer] Add Draw_AddFont for registering a font

It's implemented only in the Vulkan renderer, partly because there's a
lot of experimenting going on with it, but the glyphs do get transferred
to the GPU (checked in render doc). No rendering is done yet: still
thinking about whether to do a quick-and-dirty test, or to add HarfBuzz
immediately, and the design surrounding that.

include/QF/GL/qf_draw.h

@@ -29,6 +29,7 @@
 #define __gl_draw_h
 
 struct qpic_s;
+struct rfont_s;
 
 void gl_Draw_Init (void);
 void gl_Draw_Shutdown (void);
@@ -54,6 +55,7 @@ void gl_Draw_Pic (int x, int y, struct qpic_s *pic);
 void gl_Draw_Picf (float x, float y, struct qpic_s *pic);
 void gl_Draw_SubPic(int x, int y, struct qpic_s *pic,
 					  int srcx, int srcy, int width, int height);
+void gl_Draw_AddFont (struct rfont_s *font);
 
 void GL_Set2D (void);
 void GL_Set2DScaled (void);

include/QF/GLSL/qf_draw.h

@@ -29,6 +29,7 @@
 #define __QF_GLSL_qf_draw_h
 
 struct qpic_s;
+struct rfont_s;
 
 void glsl_Draw_Init (void);
 void glsl_Draw_Shutdown (void);
@@ -54,6 +55,7 @@ void glsl_Draw_Pic (int x, int y, struct qpic_s *pic);
 void glsl_Draw_Picf (float x, float y, struct qpic_s *pic);
 void glsl_Draw_SubPic(int x, int y, struct qpic_s *pic,
 					  int srcx, int srcy, int width, int height);
+void glsl_Draw_AddFont (struct rfont_s *font);
 
 void GLSL_Set2D (void);
 void GLSL_Set2DScaled (void);

include/QF/Vulkan/qf_draw.h

@@ -31,6 +31,7 @@
 struct vulkan_ctx_s;
 struct qfv_renderframe_s;
 struct qpic_s;
+struct rfont_s;
 
 void Vulkan_Draw_Init (struct vulkan_ctx_s *ctx);
 void Vulkan_Draw_Shutdown (struct vulkan_ctx_s *ctx);
@@ -71,6 +72,7 @@ void Vulkan_Draw_Picf (float x, float y, struct qpic_s *pic,
 void Vulkan_Draw_SubPic(int x, int y, struct qpic_s *pic,
 						int srcx, int srcy, int width, int height,
 						struct vulkan_ctx_s *ctx);
+void Vulkan_Draw_AddFont (struct rfont_s *font, struct vulkan_ctx_s *ctx);
 
 void Vulkan_Set2D (struct vulkan_ctx_s *ctx);
 void Vulkan_Set2DScaled (struct vulkan_ctx_s *ctx);

include/QF/draw.h

@@ -243,6 +243,10 @@ void Draw_Picf (float x, float y, qpic_t *pic);
 	\param height vertical size of the sub-region to be drawn
 */
 void Draw_SubPic(int x, int y, qpic_t *pic, int srcx, int srcy, int width, int height);
+
+struct rfont_s;
+void Draw_AddFont (struct rfont_s *font);
+
 ///@}
 
 #endif//__QF_draw_h

include/QF/plugin/vid_render.h

@@ -78,6 +78,7 @@ typedef struct vid_model_funcs_s {
 } vid_model_funcs_t;
 
 struct tex_s;
+struct rfont_s;
 typedef void (*capfunc_t) (struct tex_s *screencap, void *data);
 
 typedef struct vid_render_funcs_s {
@@ -103,6 +104,7 @@ typedef struct vid_render_funcs_s {
 	void (*Draw_Pic) (int x, int y, qpic_t *pic);
 	void (*Draw_Picf) (float x, float y, qpic_t *pic);
 	void (*Draw_SubPic) (int x, int y, qpic_t *pic, int srcx, int srcy, int width, int height);
+	void (*Draw_AddFont) (struct rfont_s *font);
 
 
 	struct psystem_s *(*ParticleSystem) (void);

libs/video/renderer/gl/gl_draw.c

@@ -1018,3 +1018,8 @@ gl_Draw_BlendScreen (quat_t color)
 	qfglColor3ubv (color_white);
 	qfglEnable (GL_TEXTURE_2D);
 }
+
+void
+gl_Draw_AddFont (struct rfont_s *font)
+{
+}

libs/video/renderer/glsl/glsl_draw.c

@@ -841,3 +841,8 @@ glsl_Draw_BlendScreen (quat_t color)
 		return;
 	draw_blendscreen (color);
 }
+
+void
+glsl_Draw_AddFont (struct rfont_s *font)
+{
+}

libs/video/renderer/r_progs.c

@@ -343,7 +343,7 @@ bi_Font_Load (progs_t *pr, void *_res)
 
 	QFile      *font_file = QFS_FOpenFile (font_path);
 	rfont_t    *font = R_FontLoad (font_file, font_size, preload);
-	(void)font;
+	r_funcs->Draw_AddFont (font);
 }
 
 static const char *

libs/video/renderer/sw/draw.c

@@ -974,3 +974,8 @@ Draw_BlendScreen (quat_t color)
 	}
 	vid.vid_internal->set_palette (vid.vid_internal->data, pal);
 }
+
+void
+Draw_AddFont (struct rfont_s *font)
+{
+}

libs/video/renderer/vid_render_gl.c

@@ -507,6 +507,7 @@ vid_render_funcs_t gl_vid_render_funcs = {
 	gl_Draw_Pic,
 	gl_Draw_Picf,
 	gl_Draw_SubPic,
+	gl_Draw_AddFont,
 
 	gl_ParticleSystem,
 	gl_R_Init,

libs/video/renderer/vid_render_glsl.c

@@ -451,6 +451,7 @@ vid_render_funcs_t glsl_vid_render_funcs = {
 	glsl_Draw_Pic,
 	glsl_Draw_Picf,
 	glsl_Draw_SubPic,
+	glsl_Draw_AddFont,
 
 	glsl_ParticleSystem,
 	glsl_R_Init,

libs/video/renderer/vid_render_sw.c

@@ -471,6 +471,7 @@ vid_render_funcs_t sw_vid_render_funcs = {
 	Draw_Pic,
 	Draw_Picf,
 	Draw_SubPic,
+	Draw_AddFont,
 
 	sw_ParticleSystem,
 	sw_R_Init,

libs/video/renderer/vid_render_vulkan.c

@@ -261,6 +261,12 @@ vulkan_Draw_SubPic (int x, int y, qpic_t *pic, int srcx, int srcy, int width, in
 	Vulkan_Draw_SubPic (x, y, pic, srcx, srcy, width, height, vulkan_ctx);
 }
 
+static void
+vulkan_Draw_AddFont (struct rfont_s *font)
+{
+	Vulkan_Draw_AddFont (font, vulkan_ctx);
+}
+
 static void
 vulkan_begin_frame (void)
 {
@@ -749,6 +755,7 @@ vid_render_funcs_t vulkan_vid_render_funcs = {
 	vulkan_Draw_Pic,
 	vulkan_Draw_Picf,
 	vulkan_Draw_SubPic,
+	vulkan_Draw_AddFont,
 
 	vulkan_ParticleSystem,
 	vulkan_R_Init,

libs/video/renderer/vulkan/vulkan_draw.c

@@ -52,6 +52,7 @@
 #include "compat.h"
 #include "QF/Vulkan/qf_draw.h"
 #include "QF/Vulkan/qf_matrices.h"
+#include "QF/Vulkan/qf_texture.h"
 #include "QF/Vulkan/qf_vid.h"
 #include "QF/Vulkan/barrier.h"
 #include "QF/Vulkan/buffer.h"
@@ -66,6 +67,7 @@
 #include "QF/Vulkan/staging.h"
 #include "QF/ui/view.h"
 
+#include "r_font.h"
 #include "r_internal.h"
 #include "vid_vulkan.h"
 
@@ -97,6 +99,8 @@ typedef struct drawframeset_s
 typedef struct drawctx_s {
 	VkSampler   sampler;
 	scrap_t    *scrap;
+	rfont_t    *font;
+	qfv_tex_t  *font_tex;
 	qfv_stagebuf_t *stage;
 	qpic_t     *crosshair;
 	qpic_t     *conchars;
@@ -369,6 +373,9 @@ Vulkan_Draw_Shutdown (vulkan_ctx_t *ctx)
 	delete_memsuper (dctx->string_memsuper);
 	QFV_DestroyScrap (dctx->scrap);
 	QFV_DestroyStagingBuffer (dctx->stage);
+	if (dctx->font_tex) {
+		Vulkan_UnloadTex (ctx, dctx->font_tex);
+	}
 }
 
 void
@@ -943,3 +950,25 @@ Vulkan_Draw_BlendScreen (quat_t color, vulkan_ctx_t *ctx)
 		draw_blendscreen (c, ctx);
 	}
 }
+
+void
+Vulkan_Draw_AddFont (rfont_t *font, vulkan_ctx_t *ctx)
+{
+	drawctx_t  *dctx = ctx->draw_context;
+
+	if (dctx->font_tex) {
+		Vulkan_UnloadTex (ctx, dctx->font_tex);
+		dctx->font_tex = 0;
+	}
+	dctx->font = font;
+	if (dctx->font) {
+		tex_t       tex = {
+			.width = font->scrap.width,
+			.height = font->scrap.height,
+			.format = tex_l,
+			.loaded = 1,
+			.data = font->scrap_bitmap,
+		};
+		dctx->font_tex = Vulkan_LoadTex (ctx, &tex, 0, "draw.font");
+	}
+}