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particle_oriented_animated_quad_vbuf*: correct vertex buffer size calculation

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This commit is contained in:
Zack Buhman 2025-11-09 19:44:13 -06:00
parent a4c6f29cb4
commit 69904efe3f
2 changed files with 30 additions and 11 deletions
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6
src/particle_oriented_animated_quad_vbuf.cpp
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@ -667,7 +667,9 @@ int init_particles_vertexbuffer(int fd, int particles_length, float ** ptr_out)
};
const int vertex_count = 4;
const int size = particles_length * vertex_count * 2 * (sizeof (float)) * 2;
const int size = particles_length * vertex_count * 2 * (sizeof (float))
+ particles_length * vertex_count * 3 * (sizeof (float));
printf("%d size %d\n", particles_length, size);
void * ptr;
int handle = create_buffer(fd, size, &ptr);
@ -728,7 +730,7 @@ int main()
int colorbuffer_ix = 0;
float theta = PI * 0.5;
particle particles[10] = {};
particle particles[16 * 16] = {};
const int particles_length = (sizeof (particles)) / (sizeof (particles[0]));
vertexbuffer_handle = init_particles_vertexbuffer(fd, particles_length, &vertexbuffer_ptr);
init_particles(particles, particles_length);

25
src/particle_oriented_animated_quad_vbuf_pixel_shader.cpp
View File

@ -698,7 +698,8 @@ int init_particles_vertexbuffer(int fd, int particles_length, float ** ptr_out)
};
const int vertex_count = 4;
const int size = particles_length * vertex_count * 2 * (sizeof (float)) * 2;
const int size = particles_length * vertex_count * 2 * (sizeof (float))
+ particles_length * vertex_count * 2 * (sizeof (float));
void * ptr;
int handle = create_buffer(fd, size, &ptr);
@ -1007,7 +1008,7 @@ int _floatbuffer(const shaders& shaders,
};
const int vertex_count = 4;
T3(_3D_DRAW_IMMD_2, (1 + vertex_count * dwords_per_vtx) - 1);
TU( VAP_VF_CNTL__PRIM_TYPE(5) // triangle fan
TU( VAP_VF_CNTL__PRIM_TYPE(13) // quad list
| VAP_VF_CNTL__PRIM_WALK(3)
| VAP_VF_CNTL__INDEX_SIZE(0)
| VAP_VF_CNTL__VTX_REUSE_DIS(0)
@ -1042,13 +1043,29 @@ void check_particles2(floatbuffer_state& state)
particle_position * out_pos = (particle_position *)state.ptrs[fb_output + 0];
particle_velocity * out_vel = (particle_velocity *)state.ptrs[fb_output + 1];
int unequal = 0;
for (int i = 0; i < state.length; i++) {
bool pos_eq =
(in_pos[i].position.x == out_pos[i].position.x) &&
(in_pos[i].position.y == out_pos[i].position.y) &&
(in_pos[i].position.z == out_pos[i].position.z);
bool vel_eq =
(in_vel[i].velocity.x == out_vel[i].velocity.x) &&
(in_vel[i].velocity.y == out_vel[i].velocity.y) &&
(in_vel[i].velocity.z == out_vel[i].velocity.z);
if (!(pos_eq && vel_eq)) {
unequal += 1;
printf("[%d] %d %d %d %d\n", i, fb_input + 0, fb_input + 1, fb_output + 0, fb_output + 1);
printf(" in pos (% 3.04f % 3.04f % 3.04f)\n", in_pos[i].position.x, in_pos[i].position.y, in_pos[i].position.z);
printf(" in vel (% 3.04f % 3.04f % 3.04f)\n", in_vel[i].velocity.x, in_vel[i].velocity.y, in_vel[i].velocity.z);
printf(" out pos (% 3.04f % 3.04f % 3.04f)\n", out_pos[i].position.x, out_pos[i].position.y, out_pos[i].position.z);
printf(" out vel (% 3.04f % 3.04f % 3.04f)\n", out_vel[i].velocity.x, out_vel[i].velocity.y, out_vel[i].velocity.z);
}
}
printf("unequal %d\n", unequal);
}
int main()
@ -1090,8 +1107,8 @@ int main()
int colorbuffer_ix = 0;
float theta = PI * 0.5;
const int floatbuffer_width = 4;
const int floatbuffer_height = 4;
const int floatbuffer_width = 8;
const int floatbuffer_height = 8;
floatbuffer_state state = create_floatbuffers(fd, floatbuffer_width * floatbuffer_height);
vertexbuffer_handle = init_particles_vertexbuffer(fd, state.length, &vertexbuffer_ptr);