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Implement hard shadows

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Abdelrahman Said 2024-09-14 18:48:07 +01:00
parent db42dd3d9e
commit 2f086fe548
1 changed files with 13 additions and 3 deletions
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16
src/shader/main_shader.c
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@ -1,6 +1,7 @@
#include "main_shader.h"
#include "img.h"
#include "obj.h"
#include "render.h"
#include "shader.h"
#include "utils.h"
#include "vec.h"
@ -38,6 +39,15 @@ FragmentResult diffuse_shader_fragment(void *shader, const V3f *barycentric, con
V3f normal = mat3x3_mul_vec3(normal_mat, (*barycentric));
V2f uv = mat2x3_mul_vec3(uv_mat, (*barycentric));
V4f shadow_position_h = V3_to_V4(position);
shadow_position_h = mat4x4_mul_vec4(shdr->shadow_matrix, shadow_position_h);
V3f shadow_position = project_vec4(shadow_position_h);
// Calculate shadow
const Render *shadow_pass = &(g_render_passes[RENDER_PASS_SHADOW]);
f32 shadow_z = get_pixel(f32, &(shadow_pass->depth), shadow_position.x, shadow_position.y);
f32 shadow = 0.3f + 0.7f * (shadow_z < shadow_position.z + 10.0f);
#pragma region darboux_frame_tangent_normals
/**
* Based on the following section of the tinyrenderer tutorial
@ -96,9 +106,9 @@ FragmentResult diffuse_shader_fragment(void *shader, const V3f *barycentric, con
f32 g = clamp(intensity + shdr->ambient.g, 0.0f, 1.0f);
f32 b = clamp(intensity + shdr->ambient.b, 0.0f, 1.0f);
output.r *= r;
output.g *= g;
output.b *= b;
output.r *= r * shadow;
output.g *= g * shadow;
output.b *= b * shadow;
return (FragmentResult){.colour = output};
}