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Text rendering and lower number of rendering funcs

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main
Cameron Murphy Reikes 1 year ago
parent 81ebac71d8
commit 449eceea63
2 changed files with 107 additions and 51 deletions
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main.c
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@ -190,6 +190,7 @@ typedef HMM_Vec4 Color;
#define WHITE (Color){1.0f, 1.0f, 1.0f, 1.0f}
#define BLACK (Color){0.0f, 0.0f, 0.0f, 1.0f}
#define RED (Color){1.0f, 0.0f, 0.0f, 1.0f}
HMM_Vec2 screen_size() {
return HMM_V2((float)sapp_width(), (float)sapp_height());
@ -210,6 +211,20 @@ HMM_Vec2 cam_offset() {
return HMM_AddV2(cam.pos, HMM_MulV2F(screen_size(), 0.5f));
}
// in pixels
HMM_Vec2 img_size(sg_image img) {
sg_image_info info = sg_query_image_info(img);
return HMM_V2((float)info.width, (float)info.height);
}
// full region in pixels
AABB full_region(sg_image img) {
return (AABB) {
.upper_left = HMM_V2(0.0f, 0.0f),
.lower_right = img_size(img),
};
}
// screen coords are in pixels counting from bottom left as (0,0), Y+ is up
HMM_Vec2 world_to_screen(HMM_Vec2 world) {
HMM_Vec2 to_return = world;
@ -285,7 +300,15 @@ bool overlapping(AABB a, AABB b) {
// points must be of length 4, and be in the order: upper left, upper right, lower right, lower left
// the points are in pixels in screen space. The image region is in pixel space of the image
void draw_quad_all_parameters(HMM_Vec2 *points, sg_image image, AABB image_region, Color tint) {
void draw_quad(bool world_space, HMM_Vec2 *points_in, sg_image image, AABB image_region, Color tint) {
HMM_Vec2 points[4] = {0};
memcpy(points, points_in, sizeof(points));
if(world_space) {
for(int i = 0; i < 4; i++) {
points[i] = world_to_screen(points[i]);
}
}
AABB cam_aabb = { .upper_left = HMM_V2(0.0, screen_size().Y), .lower_right = HMM_V2(screen_size().X, 0.0) };
AABB points_bounding_box = { .upper_left = HMM_V2(INFINITY, -INFINITY), .lower_right = HMM_V2(-INFINITY, INFINITY) };
@ -340,27 +363,70 @@ void draw_quad_all_parameters(HMM_Vec2 *points, sg_image image, AABB image_regio
sg_draw(0, 6, 1);
}
void draw_quad_world_all(HMM_Vec2 *points, sg_image image, AABB image_region, Color tint) {
HMM_Vec2 into_screen[4] = {0};
memcpy(into_screen, points, sizeof(into_screen));
for(int i = 0; i < 4; i++) {
into_screen[i] = world_to_screen(into_screen[i]);
}
draw_quad_all_parameters(into_screen, image, image_region, tint);
}
// in pixels
HMM_Vec2 img_size(sg_image img) {
sg_image_info info = sg_query_image_info(img);
return HMM_V2((float)info.width, (float)info.height);
void colorbox(bool world_space, HMM_Vec2 upper_left, HMM_Vec2 lower_right, Color color) {
HMM_Vec2 size = HMM_SubV2(lower_right, upper_left);
size.Y *= -1.0;
assert(size.Y >= 0.0);
HMM_Vec2 points[4] = {
HMM_AddV2(upper_left, HMM_V2(0.0f, 0.0f)),
HMM_AddV2(upper_left, HMM_V2(size.X, 0.0f)),
HMM_AddV2(upper_left, HMM_V2(size.X, -size.Y)),
HMM_AddV2(upper_left, HMM_V2(0.0f, -size.Y)),
};
draw_quad(world_space, points, image_white_square, full_region(image_white_square), color);
}
// full region in pixels
AABB full_region(sg_image img) {
return (AABB) {
.upper_left = HMM_V2(0.0f, 0.0f),
.lower_right = img_size(img),
};
// returns bounds. To measure text you can set dry run to true and get the bounds
AABB draw_text(bool world_space, bool dry_run, const char *text, size_t length, HMM_Vec2 pos, Color color) {
size_t text_len = strlen(text);
AABB bounds = {0};
float y = 0.0;
float x = 0.0;
for(int i = 0; i < text_len; i++) {
stbtt_aligned_quad q;
float old_y = y;
stbtt_GetBakedQuad(cdata, 512, 512, text[i]-32, &x, &y, &q, 1);
float difference = y - old_y;
y = old_y + difference;
HMM_Vec2 size = HMM_V2(q.x1 - q.x0, q.y1 - q.y0);
if(size.Y > 0.0 && size.X > 0.0) { // spaces (and maybe other characters) produce quads of size 0
HMM_Vec2 points[4] = {
HMM_AddV2(HMM_V2(q.x0, -q.y0), HMM_V2(0.0f, 0.0f)),
HMM_AddV2(HMM_V2(q.x0, -q.y0), HMM_V2(size.X, 0.0f)),
HMM_AddV2(HMM_V2(q.x0, -q.y0), HMM_V2(size.X, -size.Y)),
HMM_AddV2(HMM_V2(q.x0, -q.y0), HMM_V2(0.0f, -size.Y)),
};
AABB font_atlas_region = (AABB) {
.upper_left = HMM_V2(q.s0, q.t0),
.lower_right = HMM_V2(q.s1, q.t1),
};
font_atlas_region.upper_left.X *= img_size(image_font).X;
font_atlas_region.lower_right.X *= img_size(image_font).X;
font_atlas_region.upper_left.Y *= img_size(image_font).Y;
font_atlas_region.lower_right.Y *= img_size(image_font).Y;
for(int i = 0; i < 4; i++) {
bounds.upper_left.X = min(bounds.upper_left.X, points[i].X);
bounds.upper_left.Y = max(bounds.upper_left.Y, points[i].Y);
bounds.lower_right.X = max(bounds.lower_right.X, points[i].X);
bounds.lower_right.Y = min(bounds.lower_right.Y, points[i].Y);
}
for(int i = 0; i < 4; i++) {
points[i] = HMM_AddV2(points[i], pos);
}
if(!dry_run) {
draw_quad(world_space, points, image_font, font_atlas_region, color);
}
}
}
return bounds;
}
double time = 0.0;
@ -376,6 +442,7 @@ void frame(void) {
double dt_double = 0.0;
{
dt_double = stm_sec(stm_diff(stm_now(), last_frame_time));
dt_double = min(dt_double, 5.0 / 60.0); // clamp dt at maximum 5 frames, avoid super huge dt
time += dt_double;
last_frame_time = stm_now();
}
@ -413,7 +480,7 @@ void frame(void) {
}
}
if(info == NULL) info = &mystery_tile;
draw_quad_world_all(points, *info->img, info->regions[0], WHITE);
draw_quad(true, points, *info->img, info->regions[0], WHITE);
}
}
}
@ -423,40 +490,29 @@ void frame(void) {
{
HMM_Vec2 points[4] = {0};
quad_points_centered_size(points, HMM_V2(0.0, 0.0), HMM_V2(250.0, 250.0));
draw_quad_world_all(points, image_font,full_region(image_font), BLACK);
draw_quad(true, points, image_font,full_region(image_font), BLACK);
}
#ifdef DEVTOOLS
// statistics
{
// background panel
colorbox(false, HMM_V2(0.0, 0.0), HMM_V2(200.0, -200.0), (Color){1.0, 1.0, 1.0, 0.5});
char frametime[128] = {0};
snprintf(frametime, 128, "Frametime: %.1f ms", dt*1000.0);
draw_text(false, false, frametime, strlen(frametime), HMM_V2(0.0, 0.0), BLACK);
}
#endif
const char *text = "great idea";
// measure text
{
AABB bounds = draw_text(true, true, text, strlen(text), HMM_V2(0.0, 0.0), BLACK);
colorbox(true, bounds.upper_left, bounds.lower_right, (Color){1.0,0.0,0.0,0.5});
}
// draw text
const char *text = "Hello, can anybody hear me?";
{
float x = 0.0;
float y = 0.0;
for(int i = 0; i < strlen(text); i++) {
stbtt_aligned_quad q;
float old_y = y;
stbtt_GetBakedQuad(cdata, 512, 512, text[i]-32, &x, &y, &q, 1);
float difference = y - old_y;
y = old_y + difference;
HMM_Vec2 size = HMM_V2(q.x1 - q.x0, q.y1 - q.y0);
HMM_Vec2 points[4] = {
HMM_AddV2(HMM_V2(q.x0, -q.y0), HMM_V2(0.0f, 0.0f)),
HMM_AddV2(HMM_V2(q.x0, -q.y0), HMM_V2(size.X, 0.0f)),
HMM_AddV2(HMM_V2(q.x0, -q.y0), HMM_V2(size.X, -size.Y)),
HMM_AddV2(HMM_V2(q.x0, -q.y0), HMM_V2(0.0f, -size.Y)),
};
AABB region = (AABB){
.upper_left = HMM_V2(q.s0, q.t0),
.lower_right = HMM_V2(q.s1, q.t1),
};
region.upper_left.X *= img_size(image_font).X;
region.lower_right.X *= img_size(image_font).X;
region.upper_left.Y *= img_size(image_font).Y;
region.lower_right.Y *= img_size(image_font).Y;
draw_quad_world_all(points, image_font, region, BLACK);
}
draw_text(true, false, text, strlen(text), HMM_V2(0.0, 0.0), BLACK);
}
// merchant
@ -471,7 +527,7 @@ void frame(void) {
region.upper_left = HMM_V2( (float)((index % ((int)img_size(image_merchant).X/cell_size)) * cell_size), 0.0);
region.lower_right = HMM_V2(region.upper_left.X + (float)cell_size, (float)cell_size);
draw_quad_world_all(points, image_merchant, region, WHITE);
draw_quad(true, points, image_merchant, region, WHITE);
sg_end_pass();
sg_commit();

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