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terrain.cpp: Cache some lightmap-related calculations
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@past-due
past-due committed Sep 11, 2023
1 parent 0280666 commit f57c9a3
Showing 1 changed file with 23 additions and 23 deletions.
46 changes: 23 additions & 23 deletions src/terrain.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,15 @@ static size_t lightmapWidth;
static size_t lightmapHeight;
/// Lightmap image
static std::unique_ptr<iV_Image> lightmapPixmap;
/// Lightmap values
struct LightmapCalculatedValues
{
glm::vec4 paramsXLight = glm::vec4();
glm::vec4 paramsYLight = glm::vec4();
glm::mat4 lightMatrix = glm::mat4(); // shift the lightmap half a tile as lights are supposed to be placed at the center of a tile
glm::mat4 ModelUVLightmap = glm::mat4();
};
static LightmapCalculatedValues lightmapValues;
/// Ticks per lightmap refresh
static const unsigned int LIGHTMAP_REFRESH = 80;

Expand Down Expand Up @@ -1467,6 +1476,13 @@ bool initTerrain()
debug(LOG_TERRAIN, "the size of the map is %ix%i", mapWidth, mapHeight);
debug(LOG_TERRAIN, "lightmap texture size is %zu x %zu", lightmapWidth, lightmapHeight);

lightmapValues.paramsXLight = glm::vec4(1.0f / world_coord(mapWidth) *((float)mapWidth / (float)lightmapWidth), 0, 0, 0);
lightmapValues.paramsYLight = glm::vec4(0, 0, -1.0f / world_coord(mapHeight) *((float)mapHeight / (float)lightmapHeight), 0);

// shift the lightmap half a tile as lights are supposed to be placed at the center of a tile
lightmapValues.lightMatrix = glm::translate(glm::vec3(1.f / (float)lightmapWidth / 2, 1.f / (float)lightmapHeight / 2, 0.f));
lightmapValues.ModelUVLightmap = lightmapValues.lightMatrix * glm::transpose(glm::mat4(lightmapValues.paramsXLight, lightmapValues.paramsYLight, glm::vec4(0,0,1,0), glm::vec4(0,0,0,1)));

// Prepare the lightmap pixmap and texture
lightmapPixmap = std::unique_ptr<iV_Image>(new iV_Image());

Expand Down Expand Up @@ -1942,9 +1958,7 @@ void perFrameTerrainUpdates()

void drawTerrainDepthOnly(const glm::mat4 &mvp)
{
const glm::vec4 paramsXLight(1.0f / world_coord(mapWidth) *((float)mapWidth / (float)lightmapWidth), 0, 0, 0);
const glm::vec4 paramsYLight(0, 0, -1.0f / world_coord(mapHeight) *((float)mapHeight / (float)lightmapHeight), 0);
drawDepthOnlyForDepthMap(mvp, paramsXLight, paramsYLight, false);
drawDepthOnlyForDepthMap(mvp, lightmapValues.paramsXLight, lightmapValues.paramsYLight, false);
}

/**
Expand All @@ -1954,12 +1968,10 @@ void drawTerrainDepthOnly(const glm::mat4 &mvp)
*/
void drawTerrain(const glm::mat4 &mvp, const glm::mat4& viewMatrix, const Vector3f &cameraPos, const Vector3f &sunPos, const ShadowCascadesInfo& shadowCascades)
{
const glm::vec4 paramsXLight(1.0f / world_coord(mapWidth) *((float)mapWidth / (float)lightmapWidth), 0, 0, 0);
const glm::vec4 paramsYLight(0, 0, -1.0f / world_coord(mapHeight) *((float)mapHeight / (float)lightmapHeight), 0);

// shift the lightmap half a tile as lights are supposed to be placed at the center of a tile
const glm::mat4 lightMatrix = glm::translate(glm::vec3(1.f / (float)lightmapWidth / 2, 1.f / (float)lightmapHeight / 2, 0.f));
const auto ModelUVLightmap = lightMatrix * glm::transpose(glm::mat4(paramsXLight, paramsYLight, glm::vec4(0,0,1,0), glm::vec4(0,0,0,1)));
const glm::vec4& paramsXLight = lightmapValues.paramsXLight;
const glm::vec4& paramsYLight = lightmapValues.paramsYLight;
const glm::mat4& lightMatrix = lightmapValues.lightMatrix;
const glm::mat4& ModelUVLightmap = lightmapValues.ModelUVLightmap;

if (true)
{
Expand Down Expand Up @@ -2005,12 +2017,6 @@ void drawWaterNormalImpl(const glm::mat4 &ModelViewProjection, const Vector3f &c
return; // no water
}

const glm::vec4 paramsXLight(1.0f / world_coord(mapWidth) *((float)mapWidth / (float)lightmapWidth), 0, 0, 0);
const glm::vec4 paramsYLight(0, 0, -1.0f / world_coord(mapHeight) *((float)mapHeight / (float)lightmapHeight), 0);
// shift the lightmap half a tile as lights are supposed to be placed at the center of a tile
const glm::mat4 lightMatrix = glm::translate(glm::vec3(1.f / (float)lightmapWidth / 2, 1.f / (float)lightmapHeight / 2, 0.f));
const auto ModelUVLightmap = lightMatrix * glm::transpose(glm::mat4(paramsXLight, paramsYLight, glm::vec4(0,0,1,0), glm::vec4(0,0,0,1)));

const glm::vec4 paramsX(0, 0, -1.0f / world_coord(4), 0);
const glm::vec4 paramsY(1.0f / world_coord(4), 0, 0, 0);
const glm::vec4 paramsX2(0, 0, -1.0f / world_coord(5), 0);
Expand All @@ -2027,7 +2033,7 @@ void drawWaterNormalImpl(const glm::mat4 &ModelViewProjection, const Vector3f &c
lightmap_texture);
PSO::get().bind_vertex_buffers(waterVBO);
PSO::get().bind_constants({
ModelViewProjection, ModelUVLightmap, ModelUV1, ModelUV2,
ModelViewProjection, lightmapValues.ModelUVLightmap, ModelUV1, ModelUV2,
glm::vec4(cameraPos, 0), glm::vec4(glm::normalize(sunPos), 0),
pie_GetLighting0(LIGHT_EMISSIVE), pie_GetLighting0(LIGHT_AMBIENT), pie_GetLighting0(LIGHT_DIFFUSE), pie_GetLighting0(LIGHT_SPECULAR),
getFogColorVec4(), renderState.fogEnabled, renderState.fogBegin, renderState.fogEnd,
Expand Down Expand Up @@ -2069,12 +2075,6 @@ void drawWaterHighImpl(const glm::mat4 &ModelViewProjection, const Vector3f &cam
return; // no water
}

const glm::vec4 paramsXLight(1.0f / world_coord(mapWidth) *((float)mapWidth / (float)lightmapWidth), 0, 0, 0);
const glm::vec4 paramsYLight(0, 0, -1.0f / world_coord(mapHeight) *((float)mapHeight / (float)lightmapHeight), 0);
// shift the lightmap half a tile as lights are supposed to be placed at the center of a tile
const glm::mat4 lightMatrix = glm::translate(glm::vec3(1.f / (float)lightmapWidth / 2, 1.f / (float)lightmapHeight / 2, 0.f));
const auto ModelUVLightmap = lightMatrix * glm::transpose(glm::mat4(paramsXLight, paramsYLight, glm::vec4(0,0,1,0), glm::vec4(0,0,0,1)));

const glm::vec4 paramsX(0, 0, -1.0f / world_coord(4), 0);
const glm::vec4 paramsY(1.0f / world_coord(4), 0, 0, 0);
const glm::vec4 paramsX2(0, 0, -1.0f / world_coord(5), 0);
Expand All @@ -2093,7 +2093,7 @@ void drawWaterHighImpl(const glm::mat4 &ModelViewProjection, const Vector3f &cam
lightmap_texture);
PSO::get().bind_vertex_buffers(waterVBO);
PSO::get().bind_constants({
ModelViewProjection, ModelUVLightmap, ModelUV1, ModelUV2,
ModelViewProjection, lightmapValues.ModelUVLightmap, ModelUV1, ModelUV2,
glm::vec4(cameraPos, 0), glm::vec4(glm::normalize(sunPos), 0),
pie_GetLighting0(LIGHT_EMISSIVE), pie_GetLighting0(LIGHT_AMBIENT), pie_GetLighting0(LIGHT_DIFFUSE), pie_GetLighting0(LIGHT_SPECULAR),
getFogColorVec4(), renderState.fogEnabled, renderState.fogBegin, renderState.fogEnd,
Expand Down

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