diff options
Diffstat (limited to 'drivers/gles3/shaders/canvas.glsl')
| -rw-r--r-- | drivers/gles3/shaders/canvas.glsl | 149 |
1 files changed, 148 insertions, 1 deletions
diff --git a/drivers/gles3/shaders/canvas.glsl b/drivers/gles3/shaders/canvas.glsl index 23db41802e..ca806304c5 100644 --- a/drivers/gles3/shaders/canvas.glsl +++ b/drivers/gles3/shaders/canvas.glsl @@ -10,6 +10,7 @@ mode_instanced = #define USE_ATTRIBUTES \n#define USE_INSTANCING #[specializations] DISABLE_LIGHTING = false +USE_RGBA_SHADOWS = false #[vertex] @@ -213,8 +214,8 @@ void main() { #ifndef DISABLE_LIGHTING uniform sampler2D atlas_texture; //texunit:-2 +uniform sampler2D shadow_atlas_texture; //texunit:-3 #endif // DISABLE_LIGHTING -//uniform sampler2D shadow_atlas_texture; //texunit:-3 uniform sampler2D screen_texture; //texunit:-4 uniform sampler2D sdf_texture; //texunit:-5 uniform sampler2D normal_texture; //texunit:-6 @@ -245,6 +246,35 @@ layout(std140) uniform MaterialUniforms{ #endif #GLOBALS + +float vec4_to_float(vec4 p_vec) { + return dot(p_vec, vec4(1.0 / (255.0 * 255.0 * 255.0), 1.0 / (255.0 * 255.0), 1.0 / 255.0, 1.0)) * 2.0 - 1.0; +} + +vec2 screen_uv_to_sdf(vec2 p_uv) { + return screen_to_sdf * p_uv; +} + +float texture_sdf(vec2 p_sdf) { + vec2 uv = p_sdf * sdf_to_tex.xy + sdf_to_tex.zw; + float d = vec4_to_float(texture(sdf_texture, uv)); + d *= SDF_MAX_LENGTH; + return d * tex_to_sdf; +} + +vec2 texture_sdf_normal(vec2 p_sdf) { + vec2 uv = p_sdf * sdf_to_tex.xy + sdf_to_tex.zw; + + const float EPSILON = 0.001; + return normalize(vec2( + vec4_to_float(texture(sdf_texture, uv + vec2(EPSILON, 0.0))) - vec4_to_float(texture(sdf_texture, uv - vec2(EPSILON, 0.0))), + vec4_to_float(texture(sdf_texture, uv + vec2(0.0, EPSILON))) - vec4_to_float(texture(sdf_texture, uv - vec2(0.0, EPSILON))))); +} + +vec2 sdf_to_screen_uv(vec2 p_sdf) { + return p_sdf * sdf_to_screen; +} + #ifndef DISABLE_LIGHTING #ifdef LIGHT_CODE_USED @@ -299,6 +329,70 @@ vec3 light_normal_compute(vec3 light_vec, vec3 normal, vec3 base_color, vec3 lig } } +#ifdef USE_RGBA_SHADOWS + +#define SHADOW_DEPTH(m_uv) (dot(textureLod(shadow_atlas_texture, (m_uv), 0.0), vec4(1.0 / (255.0 * 255.0 * 255.0), 1.0 / (255.0 * 255.0), 1.0 / 255.0, 1.0)) * 2.0 - 1.0) + +#else + +#define SHADOW_DEPTH(m_uv) (textureLod(shadow_atlas_texture, (m_uv), 0.0).r) + +#endif + +#define SHADOW_TEST(m_uv) \ + { \ + highp float sd = SHADOW_DEPTH(m_uv); \ + shadow += step(sd, shadow_uv.z / shadow_uv.w); \ + } + +//float distance = length(shadow_pos); +vec4 light_shadow_compute(uint light_base, vec4 light_color, vec4 shadow_uv +#ifdef LIGHT_CODE_USED + , + vec3 shadow_modulate +#endif +) { + float shadow = 0.0; + uint shadow_mode = light_array[light_base].flags & LIGHT_FLAGS_FILTER_MASK; + + if (shadow_mode == LIGHT_FLAGS_SHADOW_NEAREST) { + SHADOW_TEST(shadow_uv.xy); + } else if (shadow_mode == LIGHT_FLAGS_SHADOW_PCF5) { + vec2 shadow_pixel_size = vec2(light_array[light_base].shadow_pixel_size, 0.0); + SHADOW_TEST(shadow_uv.xy - shadow_pixel_size * 2.0); + SHADOW_TEST(shadow_uv.xy - shadow_pixel_size); + SHADOW_TEST(shadow_uv.xy); + SHADOW_TEST(shadow_uv.xy + shadow_pixel_size); + SHADOW_TEST(shadow_uv.xy + shadow_pixel_size * 2.0); + shadow /= 5.0; + } else { //PCF13 + vec2 shadow_pixel_size = vec2(light_array[light_base].shadow_pixel_size, 0.0); + SHADOW_TEST(shadow_uv.xy - shadow_pixel_size * 6.0); + SHADOW_TEST(shadow_uv.xy - shadow_pixel_size * 5.0); + SHADOW_TEST(shadow_uv.xy - shadow_pixel_size * 4.0); + SHADOW_TEST(shadow_uv.xy - shadow_pixel_size * 3.0); + SHADOW_TEST(shadow_uv.xy - shadow_pixel_size * 2.0); + SHADOW_TEST(shadow_uv.xy - shadow_pixel_size); + SHADOW_TEST(shadow_uv.xy); + SHADOW_TEST(shadow_uv.xy + shadow_pixel_size); + SHADOW_TEST(shadow_uv.xy + shadow_pixel_size * 2.0); + SHADOW_TEST(shadow_uv.xy + shadow_pixel_size * 3.0); + SHADOW_TEST(shadow_uv.xy + shadow_pixel_size * 4.0); + SHADOW_TEST(shadow_uv.xy + shadow_pixel_size * 5.0); + SHADOW_TEST(shadow_uv.xy + shadow_pixel_size * 6.0); + shadow /= 13.0; + } + + vec4 shadow_color = unpackUnorm4x8(light_array[light_base].shadow_color); +#ifdef LIGHT_CODE_USED + shadow_color.rgb *= shadow_modulate; +#endif + + shadow_color.a *= light_color.a; //respect light alpha + + return mix(light_color, shadow_color, shadow); +} + void light_blend_compute(uint light_base, vec4 light_color, inout vec3 color) { uint blend_mode = light_array[light_base].flags & LIGHT_FLAGS_BLEND_MASK; @@ -527,6 +621,19 @@ void main() { } #endif + if (bool(light_array[light_base].flags & LIGHT_FLAGS_HAS_SHADOW)) { + vec2 shadow_pos = (vec4(shadow_vertex, 0.0, 1.0) * mat4(light_array[light_base].shadow_matrix[0], light_array[light_base].shadow_matrix[1], vec4(0.0, 0.0, 1.0, 0.0), vec4(0.0, 0.0, 0.0, 1.0))).xy; //multiply inverse given its transposed. Optimizer removes useless operations. + + vec4 shadow_uv = vec4(shadow_pos.x, light_array[light_base].shadow_y_ofs, shadow_pos.y * light_array[light_base].shadow_zfar_inv, 1.0); + + light_color = light_shadow_compute(light_base, light_color, shadow_uv +#ifdef LIGHT_CODE_USED + , + shadow_modulate.rgb +#endif + ); + } + light_blend_compute(light_base, light_color, color.rgb); } @@ -584,6 +691,46 @@ void main() { light_color.a = 0.0; } + if (bool(light_array[light_base].flags & LIGHT_FLAGS_HAS_SHADOW)) { + vec2 shadow_pos = (vec4(shadow_vertex, 0.0, 1.0) * mat4(light_array[light_base].shadow_matrix[0], light_array[light_base].shadow_matrix[1], vec4(0.0, 0.0, 1.0, 0.0), vec4(0.0, 0.0, 0.0, 1.0))).xy; //multiply inverse given its transposed. Optimizer removes useless operations. + + vec2 pos_norm = normalize(shadow_pos); + vec2 pos_abs = abs(pos_norm); + vec2 pos_box = pos_norm / max(pos_abs.x, pos_abs.y); + vec2 pos_rot = pos_norm * mat2(vec2(0.7071067811865476, -0.7071067811865476), vec2(0.7071067811865476, 0.7071067811865476)); //is there a faster way to 45 degrees rot? + float tex_ofs; + float dist; + if (pos_rot.y > 0.0) { + if (pos_rot.x > 0.0) { + tex_ofs = pos_box.y * 0.125 + 0.125; + dist = shadow_pos.x; + } else { + tex_ofs = pos_box.x * -0.125 + (0.25 + 0.125); + dist = shadow_pos.y; + } + } else { + if (pos_rot.x < 0.0) { + tex_ofs = pos_box.y * -0.125 + (0.5 + 0.125); + dist = -shadow_pos.x; + } else { + tex_ofs = pos_box.x * 0.125 + (0.75 + 0.125); + dist = -shadow_pos.y; + } + } + + dist *= light_array[light_base].shadow_zfar_inv; + + //float distance = length(shadow_pos); + vec4 shadow_uv = vec4(tex_ofs, light_array[light_base].shadow_y_ofs, dist, 1.0); + + light_color = light_shadow_compute(light_base, light_color, shadow_uv +#ifdef LIGHT_CODE_USED + , + shadow_modulate.rgb +#endif + ); + } + light_blend_compute(light_base, light_color, color.rgb); } #endif |