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Make usage of SDL renderer optional

This commit is contained in:
Francesco Abbate 2021-04-29 14:15:24 +02:00
parent 7c79105d2f
commit 3d84fe5488
8 changed files with 201 additions and 107 deletions
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5
meson.build
View File

@ -40,6 +40,11 @@ if host_machine.system() == 'windows'
lite_rc += windows.compile_resources('res.rc')
endif
# On macos we need to use the SDL renderer to support retina displays
if get_option('renderer') or host_machine.system() == 'darwin'
lite_cargs += '-DLITE_USE_SDL_RENDERER'
endif
subdir('lib/font_renderer')
subdir('src')

1
meson_options.txt
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@ -1,2 +1,3 @@
option('portable', type : 'boolean', value : false, description: 'Portable install')
option('renderer', type : 'boolean', value : false, description: 'Use SDL renderer')

4
src/api/system.c
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@ -109,7 +109,7 @@ top:
case SDL_WINDOWEVENT:
if (e.window.event == SDL_WINDOWEVENT_RESIZED) {
ren_setup_renderer();
ren_resize_window();
lua_pushstring(L, "resized");
/* The size below will be in points. */
lua_pushnumber(L, e.window.data1);
@ -318,7 +318,7 @@ static int f_set_window_size(lua_State *L) {
double y = luaL_checknumber(L, 4);
SDL_SetWindowSize(window, w, h);
SDL_SetWindowPosition(window, x, y);
ren_setup_renderer();
ren_resize_window();
return 0;
}

1
src/meson.build
View File

@ -5,6 +5,7 @@ lite_sources = [
'api/renderer_font.c',
'api/system.c',
'renderer.c',
'renwindow.c',
'fontdesc.c',
'rencache.c',
'main.c',

145
src/renderer.c
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@ -2,8 +2,9 @@
#include <stdbool.h>
#include <assert.h>
#include <math.h>
#include "renderer.h"
#include "font_renderer.h"
#include "renderer.h"
#include "renwindow.h"
#define MAX_GLYPHSET 256
#define REPLACEMENT_CHUNK_SIZE 8
@ -31,17 +32,7 @@ struct RenFont {
FR_Renderer *renderer;
};
struct Renderer {
SDL_Window *window;
SDL_Renderer *renderer;
SDL_Texture *texture;
SDL_Surface *surface;
FR_Clip_Area clip; /* Clipping rect in pixel coordinates. */
int surface_scale;
};
static struct Renderer renderer = {0};
static RenWindow window_renderer = {0};
static void* check_alloc(void *ptr) {
if (!ptr) {
@ -69,34 +60,6 @@ static const char* utf8_to_codepoint(const char *p, unsigned *dst) {
}
static int get_surface_scale() {
int w_pixels, h_pixels;
int w_points, h_points;
SDL_GL_GetDrawableSize(renderer.window, &w_pixels, &h_pixels);
SDL_GetWindowSize(renderer.window, &w_points, &h_points);
/* We consider that the ratio pixel/point will always be an integer and
it is the same along the x and the y axis. */
assert(w_pixels % w_points == 0 && h_pixels % h_points == 0 && w_pixels / w_points == h_pixels / h_points);
return w_pixels / w_points;
}
static FR_Clip_Area scaled_clip(const RenRect rect, const int scale) {
return (FR_Clip_Area) {rect.x * scale, rect.y * scale, (rect.x + rect.width) * scale, (rect.y + rect.height) * scale};
}
static void init_window_surface() {
if (renderer.surface) {
SDL_FreeSurface(renderer.surface);
}
int w, h;
SDL_GL_GetDrawableSize(renderer.window, &w, &h);
renderer.surface = SDL_CreateRGBSurfaceWithFormat(0, w, h, 32, SDL_PIXELFORMAT_BGRA32);
renderer.clip = scaled_clip((RenRect) { 0, 0, w, h }, 1);
}
void ren_cp_replace_init(CPReplaceTable *rep_table) {
rep_table->size = 0;
rep_table->replacements = NULL;
@ -128,78 +91,43 @@ void ren_cp_replace_add(CPReplaceTable *rep_table, const char *src, const char *
}
void ren_free_window_resources() {
SDL_DestroyWindow(renderer.window);
SDL_DestroyRenderer(renderer.renderer);
SDL_DestroyTexture(renderer.texture);
renderer.window = NULL;
renderer.renderer = NULL;
}
static void setup_renderer(int w, int h) {
/* Note that w and h here should always be in pixels and obtained from
a call to SDL_GL_GetDrawableSize(). */
if (renderer.renderer) {
SDL_DestroyRenderer(renderer.renderer);
SDL_DestroyTexture(renderer.texture);
}
renderer.renderer = SDL_CreateRenderer(renderer.window, -1, 0);
// May be we could use: SDL_CreateTextureFromSurface(sdlRenderer, mySurface);
renderer.texture = SDL_CreateTexture(renderer.renderer, SDL_PIXELFORMAT_BGRA32, SDL_TEXTUREACCESS_STREAMING, w, h);
renderer.surface_scale = get_surface_scale();
renwin_free(&window_renderer);
}
void ren_init(SDL_Window *win) {
assert(win);
renderer.window = win;
init_window_surface();
renderer.surface_scale = get_surface_scale();
window_renderer.window = win;
renwin_init_surface(&window_renderer);
renwin_clip_to_surface(&window_renderer);
}
void ren_setup_renderer() {
int new_w, new_h;
SDL_GL_GetDrawableSize(renderer.window, &new_w, &new_h);
/* Note that (w, h) may differ from (new_w, new_h) on retina displays. */
if (new_w != renderer.surface->w || new_h != renderer.surface->h) {
init_window_surface();
setup_renderer(new_w, new_h);
}
void ren_resize_window() {
renwin_resize_surface(&window_renderer);
}
void ren_update_rects(RenRect *rects, int count) {
static bool initial_frame = true;
if (initial_frame) {
int w, h;
SDL_ShowWindow(renderer.window);
SDL_GL_GetDrawableSize(renderer.window, &w, &h);
setup_renderer(w, h);
renwin_show_window(&window_renderer);
initial_frame = false;
}
const int scale = renderer.surface_scale;
for (int i = 0; i < count; i++) {
const RenRect *r = &rects[i];
const int x = scale * r->x, y = scale * r->y;
const int w = scale * r->width, h = scale * r->height;
const SDL_Rect sr = {.x = x, .y = y, .w = w, .h = h};
int32_t *pixels = ((int32_t *) renderer.surface->pixels) + x + renderer.surface->w * y;
SDL_UpdateTexture(renderer.texture, &sr, pixels, renderer.surface->w * 4);
}
SDL_RenderCopy(renderer.renderer, renderer.texture, NULL, NULL);
SDL_RenderPresent(renderer.renderer);
renwin_update_rects(&window_renderer, rects, count);
}
void ren_set_clip_rect(RenRect rect) {
renderer.clip = scaled_clip(rect, renderer.surface_scale);
renwin_set_clip_rect(&window_renderer, rect);
}
void ren_get_size(int *x, int *y) {
const int scale = renderer.surface_scale;
*x = renderer.surface->w / scale;
*y = renderer.surface->h / scale;
RenWindow *ren = &window_renderer;
const int scale = renwin_surface_scale(ren);
SDL_Surface *surface = renwin_get_surface(ren);
*x = surface->w / scale;
*y = surface->h / scale;
}
@ -313,7 +241,7 @@ int ren_get_font_width(FontDesc *font_desc, const char *text, int *subpixel_scal
int x = 0;
const char *p = text;
unsigned codepoint;
const int surface_scale = renderer.surface_scale;
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
while (*p) {
p = utf8_to_codepoint(p, &codepoint);
@ -332,7 +260,7 @@ int ren_get_font_width(FontDesc *font_desc, const char *text, int *subpixel_scal
int ren_get_font_height(FontDesc *font_desc) {
const int surface_scale = renderer.surface_scale;
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
return (font->height + surface_scale / 2) / surface_scale;
}
@ -359,7 +287,7 @@ static inline RenColor blend_pixel(RenColor dst, RenColor src) {
void ren_draw_rect(RenRect rect, RenColor color) {
if (color.a == 0) { return; }
const int surface_scale = renderer.surface_scale;
const int surface_scale = renwin_surface_scale(&window_renderer);
/* transforms coordinates in pixels. */
rect.x *= surface_scale;
@ -367,16 +295,18 @@ void ren_draw_rect(RenRect rect, RenColor color) {
rect.width *= surface_scale;
rect.height *= surface_scale;
int x1 = rect.x < renderer.clip.left ? renderer.clip.left : rect.x;
int y1 = rect.y < renderer.clip.top ? renderer.clip.top : rect.y;
const RenRect clip = window_renderer.clip;
int x1 = rect.x < clip.x ? clip.x : rect.x;
int y1 = rect.y < clip.y ? clip.y : rect.y;
int x2 = rect.x + rect.width;
int y2 = rect.y + rect.height;
x2 = x2 > renderer.clip.right ? renderer.clip.right : x2;
y2 = y2 > renderer.clip.bottom ? renderer.clip.bottom : y2;
x2 = x2 > clip.x + clip.width ? clip.x + clip.width : x2;
y2 = y2 > clip.y + clip.height ? clip.y + clip.height : y2;
RenColor *d = (RenColor*) renderer.surface->pixels;
d += x1 + y1 * renderer.surface->w;
int dr = renderer.surface->w - (x2 - x1);
SDL_Surface *surface = renwin_get_surface(&window_renderer);
RenColor *d = (RenColor*) surface->pixels;
d += x1 + y1 * surface->w;
int dr = surface->w - (x2 - x1);
if (color.a == 0xff) {
rect_draw_loop(color);
@ -397,10 +327,17 @@ static int codepoint_replace(CPReplaceTable *rep_table, unsigned *codepoint) {
return 0;
}
static FR_Clip_Area clip_area_from_rect(const RenRect r) {
return (FR_Clip_Area) {r.x, r.y, r.x + r.width, r.y + r.height};
}
static void draw_text_impl(RenFont *font, const char *text, int x_subpixel, int y_pixel, RenColor color,
CPReplaceTable *replacements, RenColor replace_color)
{
SDL_Surface *surf = renderer.surface;
SDL_Surface *surf = renwin_get_surface(&window_renderer);
FR_Clip_Area clip = clip_area_from_rect(window_renderer.clip);
const char *p = text;
unsigned codepoint;
const FR_Color color_fr = { .r = color.r, .g = color.g, .b = color.b };
@ -419,7 +356,7 @@ static void draw_text_impl(RenFont *font, const char *text, int x_subpixel, int
color_rep = color_fr;
}
if (color.a != 0) {
FR_Blend_Glyph(font->renderer, &renderer.clip,
FR_Blend_Glyph(font->renderer, &clip,
x_subpixel, y_pixel, (uint8_t *) surf->pixels, surf->w, set->image, g, color_rep);
}
x_subpixel += xadvance_original_cp;
@ -430,7 +367,7 @@ static void draw_text_impl(RenFont *font, const char *text, int x_subpixel, int
void ren_draw_text_subpixel(FontDesc *font_desc, const char *text, int x_subpixel, int y, RenColor color,
CPReplaceTable *replacements, RenColor replace_color)
{
const int surface_scale = renderer.surface_scale;
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
draw_text_impl(font, text, x_subpixel, surface_scale * y, color, replacements, replace_color);
}
@ -438,7 +375,7 @@ void ren_draw_text_subpixel(FontDesc *font_desc, const char *text, int x_subpixe
void ren_draw_text(FontDesc *font_desc, const char *text, int x, int y, RenColor color,
CPReplaceTable *replacements, RenColor replace_color)
{
const int surface_scale = renderer.surface_scale;
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
const int subpixel_scale = surface_scale * FR_Subpixel_Scale(font->renderer);
draw_text_impl(font, text, subpixel_scale * x, surface_scale * y, color, replacements, replace_color);
@ -459,7 +396,7 @@ int ren_font_subpixel_round(int width, int subpixel_scale, int orientation) {
int ren_get_font_subpixel_scale(FontDesc *font_desc) {
const int surface_scale = renderer.surface_scale;
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
return FR_Subpixel_Scale(font->renderer) * surface_scale;
}

2
src/renderer.h
View File

@ -36,7 +36,7 @@ typedef struct CPReplaceTable CPReplaceTable;
void ren_init(SDL_Window *win);
void ren_setup_renderer();
void ren_resize_window();
void ren_update_rects(RenRect *rects, int count);
void ren_set_clip_rect(RenRect rect);
void ren_get_size(int *x, int *y); /* Reports the size in points. */

125
src/renwindow.c Normal file
View File

@ -0,0 +1,125 @@
#include <assert.h>
#include "renwindow.h"
#ifdef LITE_USE_SDL_RENDERER
static int query_surface_scale(RenWindow *ren) {
int w_pixels, h_pixels;
int w_points, h_points;
SDL_GL_GetDrawableSize(ren->window, &w_pixels, &h_pixels);
SDL_GetWindowSize(ren->window, &w_points, &h_points);
/* We consider that the ratio pixel/point will always be an integer and
it is the same along the x and the y axis. */
assert(w_pixels % w_points == 0 && h_pixels % h_points == 0 && w_pixels / w_points == h_pixels / h_points);
return w_pixels / w_points;
}
#endif
void renwin_init_surface(RenWindow *ren) {
#ifdef LITE_USE_SDL_RENDERER
if (ren->surface) {
SDL_FreeSurface(ren->surface);
}
int w, h;
SDL_GL_GetDrawableSize(ren->window, &w, &h);
ren->surface = SDL_CreateRGBSurfaceWithFormat(0, w, h, 32, SDL_PIXELFORMAT_BGRA32);
ren->surface_scale = query_surface_scale(ren);
#endif
}
int renwin_surface_scale(RenWindow *ren) {
#ifdef LITE_USE_SDL_RENDERER
return ren->surface_scale;
#else
return 1;
#endif
}
static RenRect scaled_rect(const RenRect rect, const int scale) {
return (RenRect) {rect.x * scale, rect.y * scale, rect.width * scale, rect.height * scale};
}
void renwin_clip_to_surface(RenWindow *ren) {
SDL_Surface *surface = renwin_get_surface(ren);
ren->clip = (RenRect) {0, 0, surface->w, surface->h};
}
void renwin_set_clip_rect(RenWindow *ren, RenRect rect) {
ren->clip = scaled_rect(rect, renwin_surface_scale(ren));
}
SDL_Surface *renwin_get_surface(RenWindow *ren) {
#ifdef LITE_USE_SDL_RENDERER
return ren->surface;
#else
return SDL_GetWindowSurface(ren->window);
#endif
}
#ifdef LITE_USE_SDL_RENDERER
static void setup_renderer(RenWindow *ren, int w, int h) {
/* Note that w and h here should always be in pixels and obtained from
a call to SDL_GL_GetDrawableSize(). */
if (ren->renderer) {
SDL_DestroyRenderer(ren->renderer);
SDL_DestroyTexture(ren->texture);
}
ren->renderer = SDL_CreateRenderer(ren->window, -1, 0);
ren->texture = SDL_CreateTexture(ren->renderer, SDL_PIXELFORMAT_BGRA32, SDL_TEXTUREACCESS_STREAMING, w, h);
ren->surface_scale = query_surface_scale(ren);
}
#endif
void renwin_resize_surface(RenWindow *ren) {
#ifdef LITE_USE_SDL_RENDERER
int new_w, new_h;
SDL_GL_GetDrawableSize(ren->window, &new_w, &new_h);
/* Note that (w, h) may differ from (new_w, new_h) on retina displays. */
if (new_w != ren->surface->w || new_h != ren->surface->h) {
renwin_init_surface(ren);
renwin_clip_to_surface(ren);
setup_renderer(ren, new_w, new_h);
}
#endif
}
void renwin_show_window(RenWindow *ren) {
SDL_ShowWindow(ren->window);
#ifdef LITE_USE_SDL_RENDERER
int w, h;
SDL_GL_GetDrawableSize(ren->window, &w, &h);
setup_renderer(ren, w, h);
#endif
}
void renwin_update_rects(RenWindow *ren, RenRect *rects, int count) {
#ifdef LITE_USE_SDL_RENDERER
const int scale = ren->surface_scale;
for (int i = 0; i < count; i++) {
const RenRect *r = &rects[i];
const int x = scale * r->x, y = scale * r->y;
const int w = scale * r->width, h = scale * r->height;
const SDL_Rect sr = {.x = x, .y = y, .w = w, .h = h};
int32_t *pixels = ((int32_t *) ren->surface->pixels) + x + ren->surface->w * y;
SDL_UpdateTexture(ren->texture, &sr, pixels, ren->surface->w * 4);
}
SDL_RenderCopy(ren->renderer, ren->texture, NULL, NULL);
SDL_RenderPresent(ren->renderer);
#else
SDL_UpdateWindowSurfaceRects(ren->window, (SDL_Rect*) rects, count);
#endif
}
void renwin_free(RenWindow *ren) {
SDL_DestroyWindow(ren->window);
ren->window = NULL;
#ifdef LITE_USE_SDL_RENDERER
SDL_DestroyRenderer(ren->renderer);
SDL_DestroyTexture(ren->texture);
SDL_FreeSurface(ren->surface);
#endif
}

25
src/renwindow.h Normal file
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@ -0,0 +1,25 @@
#include <SDL.h>
#include "renderer.h"
struct RenWindow {
SDL_Window *window;
RenRect clip; /* Clipping rect in pixel coordinates. */
#ifdef LITE_USE_SDL_RENDERER
SDL_Renderer *renderer;
SDL_Texture *texture;
SDL_Surface *surface;
int surface_scale;
#endif
};
typedef struct RenWindow RenWindow;
void renwin_init_surface(RenWindow *ren);
int renwin_surface_scale(RenWindow *ren);
void renwin_clip_to_surface(RenWindow *ren);
void renwin_set_clip_rect(RenWindow *ren, RenRect rect);
void renwin_resize_surface(RenWindow *ren);
void renwin_show_window(RenWindow *ren);
void renwin_update_rects(RenWindow *ren, RenRect *rects, int count);
void renwin_free(RenWindow *ren);
SDL_Surface *renwin_get_surface(RenWindow *ren);