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I hate font rendering

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This commit is contained in:
Alessandro Mauri 2023-01-30 00:19:44 +01:00
parent 4162e6d302
commit 357884e2fb
8 changed files with 5345 additions and 14 deletions
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27
opengl-ren/main.c
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@ -1,5 +1,3 @@
#include <SDL2/SDL_events.h>
#include <stddef.h>
#define _POSIX_C_SOURCE 200809l
#include <sys/mman.h>
@ -47,8 +45,8 @@ typedef struct PACKED {
} vec4;
// a vertex has a position and a color
struct PACKED vertex {
vec2 pos;
struct PACKED vertex {
vec2 pos;
vec2 texture;
vec4 color;
};
@ -83,12 +81,12 @@ void grow_stack(int step)
if(!vstack.v)
err(-1, "Could not allocate stack #S: %s", strerror(errno));
memset(&(vstack.v[vstack.size]), 0, step*sizeof(*(vstack.v)));
vstack.size += step;
vstack.size += step;
}
void push(struct vertex v)
{
if (vstack.idx <= vstack.size)
if (vstack.idx >= vstack.size)
grow_stack(6);
vstack.v[vstack.idx++] = v;
}
@ -412,30 +410,30 @@ void import_font(const char *path)
img = (const struct _ff *)map;
fw = ntohl(img->w);
fh = ntohl(img->h);
glGenTextures(1, &ren.font_texture);
glBindTexture(GL_TEXTURE_2D, ren.font_texture);
// farbfeld image
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, fw, fh, 0, GL_RGBA, GL_UNSIGNED_SHORT, img->bytes);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
munmap((void *)map, size);
}
void push_text(int x, int y, const char *s)
void push_text(int x, int y, float scale, const char *s)
{
for (; *s; s++) {
int u, v;
int idx = *s - ' ';
u = idx % (fw / gw);
v = (idx / (fw / gw)) % (fh / gh);
vstack_push_quad_t(x, y, gw*2, gh*2, u*gw, v*gh);
x += gw*2;
vstack_push_quad_t(x, y, gw*scale, gh*scale, u*gw, v*gh);
x += gw*scale;
if (*s == '\n')
y += gh;
}
@ -501,7 +499,7 @@ int main (void)
vstack_push_quad_c(0, 0, 100, 100, magenta);
vstack_push_quad_c(200, 0, 10, 10, magenta);
vstack_push_quad_c(10, 150, 100, 100, magenta);
push_text(250, 250, "ò Ciao Victoria <3");
push_text(250, 250, 1.0f, "Ciao Victoria <3");
update_hash();
ren_drawvertbuffer();
@ -514,6 +512,7 @@ int main (void)
glDisableVertexAttribArray(vertindex);
glDisableVertexAttribArray(colindex);
glDeleteTextures(1, &ren.font_texture);
glDeleteBuffers(1, &ren.gl_vertbuffer);
SDL_GL_DeleteContext(ren.gl);
SDL_DestroyWindow(ren.w);
SDL_Quit();