diff options
Diffstat (limited to 'drivers/gles3/shaders/scene.glsl')
| -rw-r--r-- | drivers/gles3/shaders/scene.glsl | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/gles3/shaders/scene.glsl b/drivers/gles3/shaders/scene.glsl index 6dd04af6b6..a2d29a9480 100644 --- a/drivers/gles3/shaders/scene.glsl +++ b/drivers/gles3/shaders/scene.glsl @@ -36,6 +36,7 @@ ADDITIVE_OMNI = false ADDITIVE_SPOT = false RENDER_MATERIAL = false SECOND_REFLECTION_PROBE = false +LIGHTMAP_BICUBIC_FILTER = false #[vertex] @@ -923,6 +924,10 @@ uniform lowp uint lightmap_slice; uniform highp vec4 lightmap_uv_scale; uniform float lightmap_exposure_normalization; +#ifdef LIGHTMAP_BICUBIC_FILTER +uniform highp vec2 lightmap_texture_size; +#endif + #ifdef USE_SH_LIGHTMAP uniform mediump mat3 lightmap_normal_xform; #endif // USE_SH_LIGHTMAP @@ -1414,6 +1419,67 @@ void reflection_process(samplerCube reflection_map, #endif // !MODE_RENDER_DEPTH +#ifdef LIGHTMAP_BICUBIC_FILTER +// w0, w1, w2, and w3 are the four cubic B-spline basis functions +float w0(float a) { + return (1.0 / 6.0) * (a * (a * (-a + 3.0) - 3.0) + 1.0); +} + +float w1(float a) { + return (1.0 / 6.0) * (a * a * (3.0 * a - 6.0) + 4.0); +} + +float w2(float a) { + return (1.0 / 6.0) * (a * (a * (-3.0 * a + 3.0) + 3.0) + 1.0); +} + +float w3(float a) { + return (1.0 / 6.0) * (a * a * a); +} + +// g0 and g1 are the two amplitude functions +float g0(float a) { + return w0(a) + w1(a); +} + +float g1(float a) { + return w2(a) + w3(a); +} + +// h0 and h1 are the two offset functions +float h0(float a) { + return -1.0 + w1(a) / (w0(a) + w1(a)); +} + +float h1(float a) { + return 1.0 + w3(a) / (w2(a) + w3(a)); +} + +vec4 textureArray_bicubic(sampler2DArray tex, vec3 uv, vec2 texture_size) { + vec2 texel_size = vec2(1.0) / texture_size; + + uv.xy = uv.xy * texture_size + vec2(0.5); + + vec2 iuv = floor(uv.xy); + vec2 fuv = fract(uv.xy); + + float g0x = g0(fuv.x); + float g1x = g1(fuv.x); + float h0x = h0(fuv.x); + float h1x = h1(fuv.x); + float h0y = h0(fuv.y); + float h1y = h1(fuv.y); + + vec2 p0 = (vec2(iuv.x + h0x, iuv.y + h0y) - vec2(0.5)) * texel_size; + vec2 p1 = (vec2(iuv.x + h1x, iuv.y + h0y) - vec2(0.5)) * texel_size; + vec2 p2 = (vec2(iuv.x + h0x, iuv.y + h1y) - vec2(0.5)) * texel_size; + vec2 p3 = (vec2(iuv.x + h1x, iuv.y + h1y) - vec2(0.5)) * texel_size; + + return (g0(fuv.y) * (g0x * texture(tex, vec3(p0, uv.z)) + g1x * texture(tex, vec3(p1, uv.z)))) + + (g1(fuv.y) * (g0x * texture(tex, vec3(p2, uv.z)) + g1x * texture(tex, vec3(p3, uv.z)))); +} +#endif //LIGHTMAP_BICUBIC_FILTER + void main() { //lay out everything, whatever is unused is optimized away anyway vec3 vertex = vertex_interp; @@ -1721,10 +1787,18 @@ void main() { #ifdef USE_SH_LIGHTMAP uvw.z *= 4.0; // SH textures use 4 times more data. + +#ifdef LIGHTMAP_BICUBIC_FILTER + vec3 lm_light_l0 = textureArray_bicubic(lightmap_textures, uvw + vec3(0.0, 0.0, 0.0), lightmap_texture_size).rgb; + vec3 lm_light_l1n1 = textureArray_bicubic(lightmap_textures, uvw + vec3(0.0, 0.0, 1.0), lightmap_texture_size).rgb; + vec3 lm_light_l1_0 = textureArray_bicubic(lightmap_textures, uvw + vec3(0.0, 0.0, 2.0), lightmap_texture_size).rgb; + vec3 lm_light_l1p1 = textureArray_bicubic(lightmap_textures, uvw + vec3(0.0, 0.0, 3.0), lightmap_texture_size).rgb; +#else vec3 lm_light_l0 = textureLod(lightmap_textures, uvw + vec3(0.0, 0.0, 0.0), 0.0).rgb; vec3 lm_light_l1n1 = textureLod(lightmap_textures, uvw + vec3(0.0, 0.0, 1.0), 0.0).rgb; vec3 lm_light_l1_0 = textureLod(lightmap_textures, uvw + vec3(0.0, 0.0, 2.0), 0.0).rgb; vec3 lm_light_l1p1 = textureLod(lightmap_textures, uvw + vec3(0.0, 0.0, 3.0), 0.0).rgb; +#endif vec3 n = normalize(lightmap_normal_xform * normal); @@ -1739,8 +1813,12 @@ void main() { specular_light += lm_light_l1p1 * 0.32573 * r.x * lightmap_exposure_normalization; } #else +#ifdef LIGHTMAP_BICUBIC_FILTER + ambient_light += textureArray_bicubic(lightmap_textures, uvw, lightmap_texture_size).rgb * lightmap_exposure_normalization; +#else ambient_light += textureLod(lightmap_textures, uvw, 0.0).rgb * lightmap_exposure_normalization; #endif +#endif } #endif // USE_LIGHTMAP #endif // USE_LIGHTMAP_CAPTURE |