diff options
| author | azagaya <azagaya.games@gmail.com> | 2019-08-08 10:24:44 -0300 |
|---|---|---|
| committer | azagaya <azagaya.games@gmail.com> | 2019-09-06 13:55:49 -0300 |
| commit | b8358680670efd75a1a91ea516d1316e2c3fad18 (patch) | |
| tree | 2f2d84a64fb1633303e4aa14a06a168c5c1cd647 /drivers/gles3/shaders | |
| parent | 3a6102a6f716904bb158819146e3fed7590b8106 (diff) | |
Create shadow_vec for altering shadow computation
In 2.1 and 3.0, light_vec could be modified for altering shadow_computations.
But it broke shadows when rotating light. shadow_vec would do the same, but without breaking
shadows in rotated lights if not used.
Add inverse light transformation to shadow vec, so it's not affected when rotating lights;
Added usage define for shadow vec.
For shadow vec working properly when rotating a light, it's needed to multiply it by light_matrix normalized. Added usage define in order to don't do that if shadow_vec not used.
Diffstat (limited to 'drivers/gles3/shaders')
| -rw-r--r-- | drivers/gles3/shaders/canvas.glsl | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/drivers/gles3/shaders/canvas.glsl b/drivers/gles3/shaders/canvas.glsl index 10c8764b8e..e83f53d648 100644 --- a/drivers/gles3/shaders/canvas.glsl +++ b/drivers/gles3/shaders/canvas.glsl @@ -345,6 +345,7 @@ void light_compute( inout vec4 light_color, vec2 light_uv, inout vec4 shadow_color, + inout vec2 shadow_vec, vec3 normal, vec2 uv, #if defined(SCREEN_UV_USED) @@ -512,6 +513,7 @@ FRAGMENT_SHADER_CODE #ifdef USE_LIGHTING vec2 light_vec = transformed_light_uv; + vec2 shadow_vec = transformed_light_uv; if (normal_used) { normal.xy = mat2(local_rot.xy, local_rot.zw) * normal.xy; @@ -539,6 +541,7 @@ FRAGMENT_SHADER_CODE real_light_color, light_uv, real_light_shadow_color, + shadow_vec, normal, uv, #if defined(SCREEN_UV_USED) @@ -557,11 +560,16 @@ FRAGMENT_SHADER_CODE color *= light; #ifdef USE_SHADOWS - // Reset light_vec to compute shadows, the shadow map is created from the light origin, so it only - // makes sense to compute shadows from there. - light_vec = light_uv_interp.zw; - - float angle_to_light = -atan(light_vec.x, light_vec.y); +#ifdef SHADOW_VEC_USED + mat3 inverse_light_matrix = mat3(light_matrix); + inverse_light_matrix[0] = normalize(inverse_light_matrix[0]); + inverse_light_matrix[1] = normalize(inverse_light_matrix[1]); + inverse_light_matrix[2] = normalize(inverse_light_matrix[2]); + shadow_vec = (mat3(inverse_light_matrix) * vec3(shadow_vec, 0.0)).xy; +#else + shadow_vec = light_uv_interp.zw; +#endif + float angle_to_light = -atan(shadow_vec.x, shadow_vec.y); float PI = 3.14159265358979323846264; /*int i = int(mod(floor((angle_to_light+7.0*PI/6.0)/(4.0*PI/6.0))+1.0, 3.0)); // +1 pq os indices estao em ordem 2,0,1 nos arrays float ang*/ @@ -572,18 +580,18 @@ FRAGMENT_SHADER_CODE vec2 point; float sh; if (abs_angle < 45.0 * PI / 180.0) { - point = light_vec; + point = shadow_vec; sh = 0.0 + (1.0 / 8.0); } else if (abs_angle > 135.0 * PI / 180.0) { - point = -light_vec; + point = -shadow_vec; sh = 0.5 + (1.0 / 8.0); } else if (angle_to_light > 0.0) { - point = vec2(light_vec.y, -light_vec.x); + point = vec2(shadow_vec.y, -shadow_vec.x); sh = 0.25 + (1.0 / 8.0); } else { - point = vec2(-light_vec.y, light_vec.x); + point = vec2(-shadow_vec.y, shadow_vec.x); sh = 0.75 + (1.0 / 8.0); } |