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OpenGL: Implement rendering of lightmaps
This commit is contained in:
David Snopek
parent
654132cb9c
commit
749f60ee36
6 changed files with 350 additions and 27 deletions
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@ -1,7 +1,7 @@
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/* clang-format off */
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#[modes]
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mode_color =
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mode_color =
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mode_color_instancing = \n#define USE_INSTANCING
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mode_depth = #define MODE_RENDER_DEPTH
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mode_depth_instancing = #define MODE_RENDER_DEPTH \n#define USE_INSTANCING
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@ -14,6 +14,9 @@ DISABLE_LIGHT_OMNI = false
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DISABLE_LIGHT_SPOT = false
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DISABLE_FOG = false
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USE_RADIANCE_MAP = true
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USE_LIGHTMAP = false
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USE_SH_LIGHTMAP = false
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USE_LIGHTMAP_CAPTURE = false
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USE_MULTIVIEW = false
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RENDER_SHADOWS = false
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RENDER_SHADOWS_LINEAR = false
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@ -676,6 +679,10 @@ multiview_data;
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/* clang-format on */
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#define LIGHT_BAKE_DISABLED 0u
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#define LIGHT_BAKE_STATIC 1u
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#define LIGHT_BAKE_DYNAMIC 2u
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#ifndef MODE_RENDER_DEPTH
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// Directional light data.
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#if !defined(DISABLE_LIGHT_DIRECTIONAL) || (!defined(ADDITIVE_OMNI) && !defined(ADDITIVE_SPOT))
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@ -685,7 +692,8 @@ struct DirectionalLightData {
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mediump float energy;
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mediump vec3 color;
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mediump float size;
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mediump vec2 pad;
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lowp uint unused;
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lowp uint bake_mode;
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mediump float shadow_opacity;
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mediump float specular;
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};
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@ -718,6 +726,9 @@ struct LightData { // This structure needs to be as packed as possible.
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mediump float cone_angle;
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mediump float specular_amount;
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mediump float shadow_opacity;
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lowp vec3 pad;
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lowp uint bake_mode;
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};
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#if !defined(DISABLE_LIGHT_OMNI) || defined(ADDITIVE_OMNI)
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@ -834,6 +845,23 @@ float sample_shadow(highp sampler2DShadow shadow, float shadow_pixel_size, vec4
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#endif // !MODE_RENDER_DEPTH
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#ifndef DISABLE_LIGHTMAP
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#ifdef USE_LIGHTMAP
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uniform mediump sampler2DArray lightmap_textures; //texunit:-4
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uniform lowp uint lightmap_slice;
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uniform highp vec4 lightmap_uv_scale;
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uniform float lightmap_exposure_normalization;
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#ifdef USE_SH_LIGHTMAP
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uniform mediump mat3 lightmap_normal_xform;
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#endif // USE_SH_LIGHTMAP
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#endif // USE_LIGHTMAP
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#ifdef USE_LIGHTMAP_CAPTURE
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uniform mediump vec4[9] lightmap_captures;
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#endif // USE_LIGHTMAP_CAPTURE
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#endif // !DISABLE_LIGHTMAP
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#ifdef USE_MULTIVIEW
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uniform highp sampler2DArray depth_buffer; // texunit:-6
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uniform highp sampler2DArray color_buffer; // texunit:-5
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@ -1406,7 +1434,6 @@ void main() {
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#endif
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// Calculate Reflection probes
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// Calculate Lightmaps
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#if defined(CUSTOM_RADIANCE_USED)
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specular_light = mix(specular_light, custom_radiance.rgb, custom_radiance.a);
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@ -1431,6 +1458,61 @@ void main() {
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ambient_light = mix(ambient_light, custom_irradiance.rgb, custom_irradiance.a);
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#endif // CUSTOM_IRRADIANCE_USED
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#ifndef DISABLE_LIGHTMAP
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#ifdef USE_LIGHTMAP_CAPTURE
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{
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vec3 wnormal = mat3(scene_data.inv_view_matrix) * normal;
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const float c1 = 0.429043;
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const float c2 = 0.511664;
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const float c3 = 0.743125;
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const float c4 = 0.886227;
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const float c5 = 0.247708;
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ambient_light += (c1 * lightmap_captures[8].rgb * (wnormal.x * wnormal.x - wnormal.y * wnormal.y) +
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c3 * lightmap_captures[6].rgb * wnormal.z * wnormal.z +
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c4 * lightmap_captures[0].rgb -
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c5 * lightmap_captures[6].rgb +
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2.0 * c1 * lightmap_captures[4].rgb * wnormal.x * wnormal.y +
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2.0 * c1 * lightmap_captures[7].rgb * wnormal.x * wnormal.z +
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2.0 * c1 * lightmap_captures[5].rgb * wnormal.y * wnormal.z +
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2.0 * c2 * lightmap_captures[3].rgb * wnormal.x +
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2.0 * c2 * lightmap_captures[1].rgb * wnormal.y +
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2.0 * c2 * lightmap_captures[2].rgb * wnormal.z) *
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scene_data.emissive_exposure_normalization;
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}
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#else
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#ifdef USE_LIGHTMAP
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{
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vec3 uvw;
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uvw.xy = uv2 * lightmap_uv_scale.zw + lightmap_uv_scale.xy;
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uvw.z = float(lightmap_slice);
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#ifdef USE_SH_LIGHTMAP
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uvw.z *= 4.0; // SH textures use 4 times more data.
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vec3 lm_light_l0 = textureLod(lightmap_textures, uvw + vec3(0.0, 0.0, 0.0), 0.0).rgb;
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vec3 lm_light_l1n1 = textureLod(lightmap_textures, uvw + vec3(0.0, 0.0, 1.0), 0.0).rgb;
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vec3 lm_light_l1_0 = textureLod(lightmap_textures, uvw + vec3(0.0, 0.0, 2.0), 0.0).rgb;
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vec3 lm_light_l1p1 = textureLod(lightmap_textures, uvw + vec3(0.0, 0.0, 3.0), 0.0).rgb;
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vec3 n = normalize(lightmap_normal_xform * normal);
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ambient_light += lm_light_l0 * 0.282095f;
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ambient_light += lm_light_l1n1 * 0.32573 * n.y * lightmap_exposure_normalization;
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ambient_light += lm_light_l1_0 * 0.32573 * n.z * lightmap_exposure_normalization;
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ambient_light += lm_light_l1p1 * 0.32573 * n.x * lightmap_exposure_normalization;
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if (metallic > 0.01) { // Since the more direct bounced light is lost, we can kind of fake it with this trick.
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vec3 r = reflect(normalize(-vertex), normal);
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specular_light += lm_light_l1n1 * 0.32573 * r.y * lightmap_exposure_normalization;
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specular_light += lm_light_l1_0 * 0.32573 * r.z * lightmap_exposure_normalization;
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specular_light += lm_light_l1p1 * 0.32573 * r.x * lightmap_exposure_normalization;
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}
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#else
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ambient_light += textureLod(lightmap_textures, uvw, 0.0).rgb * lightmap_exposure_normalization;
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#endif
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}
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#endif // USE_LIGHTMAP
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#endif // USE_LIGHTMAP_CAPTURE
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#endif // !DISABLE_LIGHTMAP
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{
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#if defined(AMBIENT_LIGHT_DISABLED)
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ambient_light = vec3(0.0, 0.0, 0.0);
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@ -1466,6 +1548,11 @@ void main() {
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#ifndef DISABLE_LIGHT_DIRECTIONAL
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for (uint i = uint(0); i < scene_data.directional_light_count; i++) {
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#if defined(USE_LIGHTMAP) && !defined(DISABLE_LIGHTMAP)
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if (directional_lights[i].bake_mode == LIGHT_BAKE_STATIC) {
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continue;
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}
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#endif
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light_compute(normal, normalize(directional_lights[i].direction), normalize(view), directional_lights[i].size, directional_lights[i].color * directional_lights[i].energy, true, 1.0, f0, roughness, metallic, 1.0, albedo, alpha,
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#ifdef LIGHT_BACKLIGHT_USED
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backlight,
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@ -1490,6 +1577,11 @@ void main() {
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if (i >= omni_light_count) {
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break;
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}
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#if defined(USE_LIGHTMAP) && !defined(DISABLE_LIGHTMAP)
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if (omni_lights[omni_light_indices[i]].bake_mode == LIGHT_BAKE_STATIC) {
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continue;
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}
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#endif
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light_process_omni(omni_light_indices[i], vertex, view, normal, f0, roughness, metallic, 1.0, albedo, alpha,
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#ifdef LIGHT_BACKLIGHT_USED
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backlight,
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@ -1513,6 +1605,11 @@ void main() {
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if (i >= spot_light_count) {
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break;
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}
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#if defined(USE_LIGHTMAP) && !defined(DISABLE_LIGHTMAP)
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if (spot_lights[spot_light_indices[i]].bake_mode == LIGHT_BAKE_STATIC) {
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continue;
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}
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#endif
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light_process_spot(spot_light_indices[i], vertex, view, normal, f0, roughness, metallic, 1.0, albedo, alpha,
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#ifdef LIGHT_BACKLIGHT_USED
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backlight,
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