Commit f1a3930ec80a7d8217e1f04a54057d4fb8a69603
2024-01-31T11:46:20
pick some code from cairo demo
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diff --git a/libc3/window/sdl2/demo/mandelbrot_f128.c b/libc3/window/sdl2/demo/mandelbrot_f128.c
index af6857e..2a1fcaa 100644
--- a/libc3/window/sdl2/demo/mandelbrot_f128.c
+++ b/libc3/window/sdl2/demo/mandelbrot_f128.c
@@ -24,6 +24,44 @@ static GLuint g_mandelbrot_f128_texture = 0;
static bool mandelbrot_f128_resize (s_sequence *seq);
static bool mandelbrot_f128_update (s_sequence *seq);
+bool mandelbrot_f128_button (s_sequence *seq, u8 button, sw x, sw y)
+{
+ s_map *map;
+ f128 *next_x;
+ f128 *next_y;
+ f128 *next_z;
+ s_window_cairo *win;
+ assert(seq);
+ win = seq->window;
+ assert(win);
+ assert(seq->tag.type == TAG_MAP);
+ map = &seq->tag.data.map;
+ assert(map->count == 9);
+ assert(map->key[1].type == TAG_SYM);
+ assert(map->key[1].data.sym == sym_1("next_x"));
+ assert(map->value[1].type == TAG_F128);
+ next_x = &map->value[1].data.f128;
+ assert(map->key[2].type == TAG_SYM);
+ assert(map->key[2].data.sym == sym_1("next_y"));
+ assert(map->value[2].type == TAG_F128);
+ next_y = &map->value[2].data.f128;
+ assert(map->key[3].type == TAG_SYM);
+ assert(map->key[3].data.sym == sym_1("next_z"));
+ assert(map->value[3].type == TAG_F128);
+ next_z = &map->value[3].data.f128;
+ if (button == 1) {
+ *next_x = *next_x + *next_z * (x - (f128) win->w / 2);
+ *next_y = *next_y + *next_z * (y - (f128) win->h / 2);
+ }
+ else if (button == 5) {
+ *next_z = *next_z * exp2l(0.5);
+ }
+ else if (button == 4) {
+ *next_z = *next_z * exp2l(-0.5);
+ }
+ return true;
+}
+
bool mandelbrot_f128_load (s_sequence *seq)
{
s_map *map;
@@ -48,18 +86,20 @@ bool mandelbrot_f128_load (s_sequence *seq)
tag_init_sym( map->key + 7, sym_1("y"));
tag_init_f128( map->value + 7, 0.0);
tag_init_sym( map->key + 8, sym_1("z"));
- tag_init_f128( map->value + 8, 0.01);
- glGenTextures(1, &g_mandelbrot_f128_texture);
+ tag_init_f128( map->value + 8, 0.0);
return true;
}
bool mandelbrot_f128_render (s_sequence *seq)
{
+ char a[80];
+ s_buf buf;
uw *h;
s_map *map;
f128 next_x;
f128 next_y;
f128 next_z;
+ s_str str;
uw *w;
s_window_sdl2 *win;
f128 *x;
@@ -160,6 +200,7 @@ static bool mandelbrot_f128_update (s_sequence *seq)
f128 _2z_xz_y;
f128 c_x;
f128 c_y;
+ u8 *data;
uw i;
uw j;
u8 k;
@@ -169,8 +210,8 @@ static bool mandelbrot_f128_update (s_sequence *seq)
f128 next_y;
f128 next_z;
u8 *pix;
- s_array *pixels;
- s_window_sdl2 *win;
+ uw stride;
+ s_window_cairo *win;
f128 z_x;
f128 z_y;
f128 z_x2;
@@ -199,12 +240,14 @@ static bool mandelbrot_f128_update (s_sequence *seq)
pixels = &map->value[4].data.array;
pix = pixels->data;
assert(pix);
+ stride = win->w * 4;
i = 0;
while (i < win->h) {
- c_y = next_y + next_z * (i - win->h / 2);
+ c_y = next_y + next_z * ((f128) i - win->h / 2);
+ pix = data + i * stride;
j = 0;
while (j < win->w) {
- c_x = next_x + next_z * (j - win->w / 2);
+ c_x = next_x + next_z * ((f128) j - win->w / 2);
z_x = c_x;
z_y = c_y;
k = 0;
@@ -218,22 +261,27 @@ static bool mandelbrot_f128_update (s_sequence *seq)
z_y2 = z_y * z_y;
k++;
}
- level = (f32) k / 255.0f;
+ level = 255 - k;
+ /*if (k)
+ printf("x %lu, y %lu, k %d, level %d", j, i, k, level);*/
pix[0] = level;
pix[1] = level;
pix[2] = level;
- pix[3] = 255;
pix += 4;
j++;
}
i++;
}
+ assert(glGetError() == GL_NO_ERROR);
glBindTexture(GL_TEXTURE_2D, g_mandelbrot_f128_texture);
+ assert(glGetError() == GL_NO_ERROR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ assert(glGetError() == GL_NO_ERROR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, win->w, win->h, 0,
GL_RGBA, GL_UNSIGNED_BYTE, pixels->data);
+ assert(glGetError() == GL_NO_ERROR);
return true;
}