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Calculate light direction from position

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Abdelrahman Said 2024-08-24 23:16:11 +01:00
parent 62aa2fbc3b
commit 8ccc424b06
1 changed files with 7 additions and 3 deletions
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10
src/shader/shaders.c
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@ -130,9 +130,11 @@ internal FragmentResult phong_shader_fragment(void *shader,
// Ambient term // Ambient term
V3f intensity = num_mul_v3(g_ambient_light, model->material.ambient); V3f intensity = num_mul_v3(g_ambient_light, model->material.ambient);
V4f hdir = V3_to_V4(g_directional_light.direction); V4f hdir = V3_to_V4(g_directional_light.position);
hdir = mat4x4_mul_vec4(matrix, hdir); hdir = mat4x4_mul_vec4(matrix, hdir);
V3f light_dir = project_vec4(hdir); V3f light_pos = project_vec4(hdir);
normalise_v3(light_pos);
V3f light_dir = sub_v3(light_pos, data->position);
// Diffuse term // Diffuse term
f32 l_dot_n = dot_v3(norm, light_dir); f32 l_dot_n = dot_v3(norm, light_dir);
@ -147,7 +149,9 @@ internal FragmentResult phong_shader_fragment(void *shader,
// Specular term // Specular term
V3f _2_l_dot_n_norm = num_mul_v3(norm, 2.0f * l_dot_n); V3f _2_l_dot_n_norm = num_mul_v3(norm, 2.0f * l_dot_n);
V3f reflected = sub_v3(_2_l_dot_n_norm, light_dir); V3f reflected = sub_v3(_2_l_dot_n_norm, light_dir);
normalise_v3(reflected);
V3f v = sub_v3(g_eye, data->position); V3f v = sub_v3(g_eye, data->position);
normalise_v3(v);
f32 r_dot_v = dot_v3(reflected, v); f32 r_dot_v = dot_v3(reflected, v);
if (r_dot_v <= 0.0f) { if (r_dot_v <= 0.0f) {
goto RETURN_OUTPUT_COLOUR; goto RETURN_OUTPUT_COLOUR;
@ -193,7 +197,7 @@ internal M4x4f get_projection_matrix(ProjectionType projection_type) {
} }
internal f32 get_intensity(const V3f *normal) { internal f32 get_intensity(const V3f *normal) {
V3f light = g_directional_light.direction; V3f light = g_directional_light.position;
normalise_v3(light); normalise_v3(light);
f32 intensity = dot_v3((*normal), light); f32 intensity = dot_v3((*normal), light);