Mastering Graphics Programming with Vulkan by Marco Castorina & Gabriel Sassone

Author:Marco Castorina & Gabriel Sassone
Language: eng
Format: epub
Publisher: Packt
Published: 2023-11-15T00:00:00+00:00

This solution provides a very efficient way to loop through the active lights for a given fragment.

CPU lights assignment

We’ll now look at the implementation. During each frame, we perform the following steps:

We start by sorting the lights by their depth value:float z_far = 100.0f;

for ( u32 i = 0; i < k_num_lights; ++i ) {

Light& light = lights[ i ];

vec4s p{ light.world_position.x,

light.world_position.y,

light.world_position.z, 1.0f };

vec3s p_min = glms_vec3_add( light.world_position,

glms_vec3_scale(

light_camera_dir,

-light.radius ) );

vec3s p_max = glms_vec3_add( light.world_position,

glms_vec3_scale(

light_camera_dir,

light.radius ) );

vec4s projected_p = glms_mat4_mulv(

world_to_camera, p );

vec4s projected_p_min = glms_mat4_mulv(

world_to_camera, p_min4 );

vec4s projected_p_max = glms_mat4_mulv(

world_to_camera, p_max4 );

SortedLight& sorted_light = sorted_lights[ i ];

sorted_light.light_index = i;

sorted_light.projected_z = ( -projected_p.z –

scene_data.z_near ) / ( z_far –

scene_data.z_near );

sorted_light.projected_z_min = ( -

projected_p_min.z - scene_data.z_near ) / (

z_far - scene_data.z_near );

sorted_light.projected_z_max = ( -

projected_p_max.z - scene_data.z_near ) / (

z_far - scene_data.z_near );

}

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