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better rendering loop

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master
Alessandro Mauri 1 year ago
parent 938e2434e4
commit 4162e6d302
Signed by: alema
GPG Key ID: 2B7BF9531FF03BE8
1 changed files with 67 additions and 33 deletions
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  1. 100
      opengl-ren/main.c

100
opengl-ren/main.c
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@ -58,17 +58,6 @@ int w_height(SDL_Window *);
int w_width(SDL_Window *);
//#define VNUM(s) (sizeof(s)/sizeof(s[0]))
//struct vertex vertbuffer[] = {
// { .pos={.x= 0.75f, .y= 0.75f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
// { .pos={.x=-0.75f, .y=-0.75f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
// { .pos={.x= 0.75f, .y=-0.75f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
// { .pos={.x= 0.75f, .y= 0.75f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
// { .pos={.x=-0.75f, .y=-0.75f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
// { .pos={.x=-0.75f, .y= 0.75f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
//};
// this just descrives a farbfeld image
// https://tools.suckless.org/farbfeld/
struct PACKED _ff {
@ -83,6 +72,8 @@ unsigned int fw, fh;
struct {
struct vertex *v;
int size, idx;
int prev_idx;
unsigned long int hash, prev_hash;
} vstack = {0};
@ -95,12 +86,49 @@ void grow_stack(int step)
vstack.size += step;
}
int vstack_push_quad_c(int x, int y, int w, int h, vec4 color)
void push(struct vertex v)
{
if (vstack.idx <= vstack.size)
grow_stack(6);
vstack.v[vstack.idx++] = v;
}
void update_hash()
{
if (!vstack.idx)
return;
unsigned int hash = 0x5400F1B3;
unsigned char *v = (unsigned char *)vstack.v;
int size = vstack.idx;
for (; size; size--) {
hash += v[size-1];
hash += hash << 10;
hash ^= hash >> 6;
}
hash += hash << 3;
hash ^= hash >> 11;
hash += hash << 15;
vstack.hash = hash;
}
void force_changed()
{
vstack.prev_idx = 0;
}
int changed()
{
return vstack.prev_idx != vstack.idx || vstack.prev_hash != vstack.hash;
}
int vstack_push_quad_c(int x, int y, int w, int h, vec4 color)
{
// x4,y4 x3,y3
// +-------------+
// |(x,y) /|
@ -124,12 +152,12 @@ int vstack_push_quad_c(int x, int y, int w, int h, vec4 color)
y4 = y3 = (float)(hh - y) / hh;
y1 = y2 = (float)(hh - y-h) / hh;
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x1, .pos.y=y1, .color=color };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x2, .pos.y=y2, .color=color };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x3, .pos.y=y3, .color=color };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x1, .pos.y=y1, .color=color };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x3, .pos.y=y3, .color=color };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x4, .pos.y=y4, .color=color };
push((struct vertex){ .pos.x=x1, .pos.y=y1, .color=color });
push((struct vertex){ .pos.x=x2, .pos.y=y2, .color=color });
push((struct vertex){ .pos.x=x3, .pos.y=y3, .color=color });
push((struct vertex){ .pos.x=x1, .pos.y=y1, .color=color });
push((struct vertex){ .pos.x=x3, .pos.y=y3, .color=color });
push((struct vertex){ .pos.x=x4, .pos.y=y4, .color=color });
return 0;
}
@ -137,9 +165,6 @@ int vstack_push_quad_c(int x, int y, int w, int h, vec4 color)
int vstack_push_quad_t(int x, int y, int w, int h, int u, int v)
{
if (vstack.idx <= vstack.size)
grow_stack(6);
// x4,y4 x3,y3
// +-------------+
// |(x,y) /|
@ -171,12 +196,12 @@ int vstack_push_quad_t(int x, int y, int w, int h, int u, int v)
v1 = v2 = (float)(v+gh) / fh;
v3 = v4 = (float)(v) / fh;
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x1, .pos.y=y1, .texture.x=u1, .texture.y=v1 };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x2, .pos.y=y2, .texture.x=u2, .texture.y=v2 };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x3, .pos.y=y3, .texture.x=u3, .texture.y=v3 };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x1, .pos.y=y1, .texture.x=u1, .texture.y=v1 };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x3, .pos.y=y3, .texture.x=u3, .texture.y=v3 };
vstack.v[vstack.idx++] = (struct vertex){ .pos.x=x4, .pos.y=y4, .texture.x=u4, .texture.y=v4 };
push((struct vertex){ .pos.x=x1, .pos.y=y1, .texture.x=u1, .texture.y=v1 });
push((struct vertex){ .pos.x=x2, .pos.y=y2, .texture.x=u2, .texture.y=v2 });
push((struct vertex){ .pos.x=x3, .pos.y=y3, .texture.x=u3, .texture.y=v3 });
push((struct vertex){ .pos.x=x1, .pos.y=y1, .texture.x=u1, .texture.y=v1 });
push((struct vertex){ .pos.x=x3, .pos.y=y3, .texture.x=u3, .texture.y=v3 });
push((struct vertex){ .pos.x=x4, .pos.y=y4, .texture.x=u4, .texture.y=v4 });
return 0;
}
@ -184,6 +209,8 @@ int vstack_push_quad_t(int x, int y, int w, int h, int u, int v)
void vstack_clear(void)
{
vstack.prev_hash = vstack.hash;
vstack.prev_idx = vstack.idx;
vstack.idx = 0;
}
@ -343,12 +370,19 @@ void ren_initshaders()
void ren_drawvertbuffer()
{
if (!changed())
return;
glClear(GL_COLOR_BUFFER_BIT);
glBindBuffer(GL_ARRAY_BUFFER, ren.gl_vertbuffer);
// upload vertex data
glBufferData(GL_ARRAY_BUFFER, vstack.idx*sizeof(struct vertex), vstack.v, GL_DYNAMIC_DRAW);
if (vstack.idx != vstack.prev_idx)
glBufferData(GL_ARRAY_BUFFER, vstack.idx*sizeof(struct vertex), vstack.v, GL_DYNAMIC_DRAW);
else
glBufferSubData(GL_ARRAY_BUFFER, 0, vstack.idx*sizeof(struct vertex), vstack.v);
// draw vertex data
glDrawArrays(GL_TRIANGLES, 0, vstack.idx);
glBindBuffer(GL_ARRAY_BUFFER, 0);
SDL_GL_SwapWindow(ren.w);
}
@ -445,6 +479,7 @@ int main (void)
ren_initvertbuffer();
glClearColor(0.3f, 0.3f, 0.3f, 0.f);
glClear(GL_COLOR_BUFFER_BIT);
// event loop and drawing
SDL_Event ev = {0};
@ -454,10 +489,10 @@ int main (void)
switch (ev.type) {
case SDL_QUIT: running = 0; break;
case SDL_WINDOWEVENT:
glClear(GL_COLOR_BUFFER_BIT);
if(ev.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
glViewport(0, 0, w_width(ren.w), w_height(ren.w));
glScissor(0, 0, w_width(ren.w), w_height(ren.w));
force_changed();
}
break;
default: break;
@ -467,11 +502,10 @@ int main (void)
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");
update_hash();
ren_drawvertbuffer();
SDL_GL_SwapWindow(ren.w);
vstack_clear();
} while(running);

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