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-rw-r--r--gfx/gl/program.h6
-rw-r--r--gfx/gl/sceneProvider.cpp2
-rw-r--r--gfx/gl/sceneRenderer.cpp28
-rw-r--r--gfx/gl/sceneRenderer.h3
-rw-r--r--gfx/gl/sceneShader.cpp2
-rw-r--r--gfx/gl/shaders/shadowDynamicPointStencil.fs16
-rw-r--r--gfx/gl/shaders/shadowDynamicPointStencil.gs36
-rw-r--r--gfx/gl/shaders/shadowDynamicPointStencil.vs17
-rw-r--r--gfx/gl/shaders/shadowStencil.fs18
-rw-r--r--gfx/gl/shaders/shadowStencil.gs28
-rw-r--r--gfx/gl/shaders/shadowStencil.vs20
-rw-r--r--gfx/gl/shadowMapper.cpp80
-rw-r--r--gfx/gl/shadowMapper.h21
-rw-r--r--gfx/gl/shadowStenciller.cpp74
-rw-r--r--gfx/gl/shadowStenciller.h27
15 files changed, 345 insertions, 33 deletions
diff --git a/gfx/gl/program.h b/gfx/gl/program.h
index c89a128..20be1aa 100644
--- a/gfx/gl/program.h
+++ b/gfx/gl/program.h
@@ -33,6 +33,12 @@ public:
return location;
}
+ explicit
+ operator bool() const
+ {
+ return location >= 0;
+ }
+
protected:
GLint location;
};
diff --git a/gfx/gl/sceneProvider.cpp b/gfx/gl/sceneProvider.cpp
index 2e8604c..4e271db 100644
--- a/gfx/gl/sceneProvider.cpp
+++ b/gfx/gl/sceneProvider.cpp
@@ -5,7 +5,7 @@ void
SceneProvider::environment(const SceneShader &, const SceneRenderer & renderer) const
{
renderer.setAmbientLight({0.5F, 0.5F, 0.5F});
- renderer.setDirectionalLight({0.6F, 0.6F, 0.6F}, {-1, 1, -1}, *this);
+ renderer.setDirectionalLight({0.6F, 0.6F, 0.6F}, {{-quarter_pi, -quarter_pi}}, *this);
}
void
diff --git a/gfx/gl/sceneRenderer.cpp b/gfx/gl/sceneRenderer.cpp
index e0938f2..b2a7d78 100644
--- a/gfx/gl/sceneRenderer.cpp
+++ b/gfx/gl/sceneRenderer.cpp
@@ -62,7 +62,7 @@ SceneRenderer::render(const SceneProvider & scene) const
shader.setViewProjection(camera.getPosition(), camera.getViewProjection());
glViewport(0, 0, size.x, size.y);
- // Geometry pass
+ // Geometry/colour pass - writes albedo, normal and position textures
glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
glEnable(GL_BLEND);
glEnable(GL_CULL_FACE);
@@ -73,7 +73,13 @@ SceneRenderer::render(const SceneProvider & scene) const
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
scene.content(shader);
- // Illumination pass
+ // Environment pass -
+ // * ambient - clears illumination texture - see setAmbientLight
+ // * directional - updates shadowMapper, reads normal and position, writes illumination - see setDirectionalLight
+ scene.environment(shader, *this);
+
+ // Scene lights pass -
+ // * per light - reads normal and position, writes illumination
glBindFramebuffer(GL_FRAMEBUFFER, gBufferIll);
glBlendFunc(GL_ONE, GL_ONE);
glActiveTexture(GL_TEXTURE0);
@@ -82,11 +88,10 @@ SceneRenderer::render(const SceneProvider & scene) const
glBindTexture(GL_TEXTURE_2D, gNormal);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D_ARRAY, shadowMapper);
- scene.environment(shader, *this);
glDisable(GL_DEPTH_TEST);
scene.lights(shader);
- // Lighting pass
+ // Composition pass - reads albedo and illumination, writes output
glBindFramebuffer(GL_FRAMEBUFFER, output);
glViewport(0, 0, size.x, size.y);
glCullFace(GL_BACK);
@@ -109,14 +114,22 @@ SceneRenderer::setAmbientLight(const RGB & colour) const
}
void
-SceneRenderer::setDirectionalLight(const RGB & colour, const Direction3D & direction, const SceneProvider & scene) const
+SceneRenderer::setDirectionalLight(
+ const RGB & colour, const LightDirection & direction, const SceneProvider & scene) const
{
if (colour.r > 0 || colour.g > 0 || colour.b > 0) {
const auto lvp = shadowMapper.update(scene, direction, camera);
glBindFramebuffer(GL_FRAMEBUFFER, gBufferIll);
+ glBlendFunc(GL_ONE, GL_ONE);
+ glActiveTexture(GL_TEXTURE0);
+ glBindTexture(GL_TEXTURE_2D, gPosition);
+ glActiveTexture(GL_TEXTURE1);
+ glBindTexture(GL_TEXTURE_2D, gNormal);
+ glActiveTexture(GL_TEXTURE2);
+ glBindTexture(GL_TEXTURE_2D_ARRAY, shadowMapper);
glViewport(0, 0, size.x, size.y);
dirLight.use();
- dirLight.setDirectionalLight(colour, direction, camera.getPosition(), lvp);
+ dirLight.setDirectionalLight(colour, direction.vector(), camera.getPosition(), lvp);
renderQuad();
}
}
@@ -142,8 +155,7 @@ SceneRenderer::DirectionalLightProgram::setDirectionalLight(
return toTextureSpaceMat * m;
};
glUniform(colourLoc, c);
- const auto nd = glm::normalize(d);
- glUniform(directionLoc, nd);
+ glUniform(directionLoc, d);
glUniform(lightPointLoc, p);
glUniform(lightViewProjectionCountLoc, static_cast<GLuint>(lvp.size()));
glUniform(lightViewProjectionLoc, std::span<const glm::mat4> {lvp * toTextureSpace});
diff --git a/gfx/gl/sceneRenderer.h b/gfx/gl/sceneRenderer.h
index 4195bcf..93470f5 100644
--- a/gfx/gl/sceneRenderer.h
+++ b/gfx/gl/sceneRenderer.h
@@ -1,6 +1,7 @@
#pragma once
#include "camera.h"
+#include "gfx/lightDirection.h"
#include "glArrays.h"
#include "program.h"
#include "sceneProvider.h"
@@ -14,7 +15,7 @@ public:
void render(const SceneProvider &) const;
void setAmbientLight(const RGB & colour) const;
- void setDirectionalLight(const RGB & colour, const Direction3D & direction, const SceneProvider &) const;
+ void setDirectionalLight(const RGB & colour, const LightDirection & direction, const SceneProvider &) const;
Camera camera;
diff --git a/gfx/gl/sceneShader.cpp b/gfx/gl/sceneShader.cpp
index 4cbccb3..571538a 100644
--- a/gfx/gl/sceneShader.cpp
+++ b/gfx/gl/sceneShader.cpp
@@ -65,7 +65,7 @@ SceneShader::SceneProgram::setViewProjection(const GlobalPosition3D & viewPoint,
void
SceneShader::SceneProgram::setViewPort(const ViewPort & viewPort) const
{
- if (viewPortLoc >= 0) {
+ if (viewPortLoc) {
glUseProgram(*this);
glUniform(viewPortLoc, viewPort);
}
diff --git a/gfx/gl/shaders/shadowDynamicPointStencil.fs b/gfx/gl/shaders/shadowDynamicPointStencil.fs
new file mode 100644
index 0000000..fe91b07
--- /dev/null
+++ b/gfx/gl/shaders/shadowDynamicPointStencil.fs
@@ -0,0 +1,16 @@
+#version 330 core
+#extension GL_ARB_shading_language_420pack : enable
+
+layout(binding = 0) uniform sampler2DArray stencilDepth;
+flat in vec3 scale;
+in vec3 texCoord;
+
+void
+main()
+{
+ float stDepth = texture(stencilDepth, texCoord).r;
+ if (stDepth >= 1) {
+ discard;
+ }
+ gl_FragDepth = gl_FragCoord.z + ((stDepth - 0.5) * scale.z);
+}
diff --git a/gfx/gl/shaders/shadowDynamicPointStencil.gs b/gfx/gl/shaders/shadowDynamicPointStencil.gs
new file mode 100644
index 0000000..7e81d97
--- /dev/null
+++ b/gfx/gl/shaders/shadowDynamicPointStencil.gs
@@ -0,0 +1,36 @@
+#version 330 core
+#extension GL_ARB_viewport_array : enable
+
+const vec2[] corners = vec2[4](vec2(-1, -1), vec2(-1, 1), vec2(1, -1), vec2(1, 1));
+const float tau = 6.28318531;
+
+uniform mat4 viewProjection[4];
+uniform int viewProjections;
+uniform vec3 sizes[4];
+uniform float size;
+
+in float vmodelYaw[];
+in ivec3 vworldPos[];
+
+flat out vec3 scale;
+out vec3 texCoord;
+
+layout(points) in;
+layout(triangle_strip, max_vertices = 16) out;
+
+void
+main()
+{
+ int viewAngle = int(round(4.0 + (vmodelYaw[0] / tau))) % 8;
+ for (gl_Layer = 0; gl_Layer < viewProjections; ++gl_Layer) {
+ scale = 2.0 * size / sizes[gl_Layer];
+ vec4 pos = viewProjection[gl_Layer] * vec4(vworldPos[0], 1);
+ for (int c = 0; c < corners.length(); ++c) {
+ gl_Position = pos + vec4(scale.xy * corners[c], 0, 0);
+ gl_Position.z = max(gl_Position.z, -1);
+ texCoord = vec3((corners[c] * 0.5) + 0.5, viewAngle);
+ EmitVertex();
+ }
+ EndPrimitive();
+ }
+}
diff --git a/gfx/gl/shaders/shadowDynamicPointStencil.vs b/gfx/gl/shaders/shadowDynamicPointStencil.vs
new file mode 100644
index 0000000..0dd2d79
--- /dev/null
+++ b/gfx/gl/shaders/shadowDynamicPointStencil.vs
@@ -0,0 +1,17 @@
+#version 330 core
+#extension GL_ARB_shading_language_420pack : enable
+
+layout(location = 0) in ivec3 worldPos;
+layout(location = 1) in float modelYaw;
+uniform ivec3 viewPoint;
+uniform vec3 centre;
+
+out float vmodelYaw;
+out ivec3 vworldPos;
+
+void
+main()
+{
+ vmodelYaw = modelYaw;
+ vworldPos = worldPos - viewPoint + ivec3(centre);
+}
diff --git a/gfx/gl/shaders/shadowStencil.fs b/gfx/gl/shaders/shadowStencil.fs
new file mode 100644
index 0000000..1164cc9
--- /dev/null
+++ b/gfx/gl/shaders/shadowStencil.fs
@@ -0,0 +1,18 @@
+#version 330 core
+#extension GL_ARB_shading_language_420pack : enable
+
+layout(binding = 0) uniform sampler2D textureAlbedo;
+
+include(`materialDetail.glsl')
+include(`materialCommon.glsl')
+in vec2 gTexCoords;
+flat in MaterialDetail gMaterial;
+
+void
+main()
+{
+ if (getTextureColour(gMaterial, gTexCoords).a < 0.5) {
+ discard;
+ }
+ gl_FragDepth = gl_FragCoord.z;
+}
diff --git a/gfx/gl/shaders/shadowStencil.gs b/gfx/gl/shaders/shadowStencil.gs
new file mode 100644
index 0000000..2c3f9bd
--- /dev/null
+++ b/gfx/gl/shaders/shadowStencil.gs
@@ -0,0 +1,28 @@
+#version 330 core
+#extension GL_ARB_viewport_array : enable
+
+include(`materialDetail.glsl')
+
+layout(triangles) in;
+layout(triangle_strip, max_vertices = 24) out;
+
+uniform mat4 viewProjection[8];
+in vec3 FragPos[];
+in vec2 TexCoords[];
+flat in MaterialDetail Material[];
+out vec2 gTexCoords;
+flat out MaterialDetail gMaterial;
+
+void
+main()
+{
+ for (gl_Layer = 0; gl_Layer < viewProjection.length(); ++gl_Layer) {
+ for (int v = 0; v < FragPos.length(); ++v) {
+ gl_Position = viewProjection[gl_Layer] * vec4(FragPos[v], 1);
+ gTexCoords = TexCoords[v];
+ gMaterial = Material[v];
+ EmitVertex();
+ }
+ EndPrimitive();
+ }
+}
diff --git a/gfx/gl/shaders/shadowStencil.vs b/gfx/gl/shaders/shadowStencil.vs
new file mode 100644
index 0000000..a15c4fb
--- /dev/null
+++ b/gfx/gl/shaders/shadowStencil.vs
@@ -0,0 +1,20 @@
+#version 330 core
+#extension GL_ARB_shading_language_420pack : enable
+
+layout(binding = 1) uniform usampler2DRect materialData;
+
+include(`meshIn.glsl')
+include(`materialDetail.glsl')
+include(`getMaterialDetail.glsl')
+
+out vec3 FragPos;
+out vec2 TexCoords;
+flat out MaterialDetail Material;
+
+void
+main()
+{
+ TexCoords = texCoord;
+ Material = getMaterialDetail(material);
+ FragPos = position;
+}
diff --git a/gfx/gl/shadowMapper.cpp b/gfx/gl/shadowMapper.cpp
index a846a3d..1b95aa3 100644
--- a/gfx/gl/shadowMapper.cpp
+++ b/gfx/gl/shadowMapper.cpp
@@ -1,13 +1,20 @@
#include "shadowMapper.h"
#include "camera.h"
#include "collections.h"
+#include "game/gamestate.h"
#include "gfx/gl/shaders/fs-shadowDynamicPointInstWithTextures.h"
+#include "gfx/gl/shaders/fs-shadowDynamicPointStencil.h"
#include "gfx/gl/shaders/gs-commonShadowPoint.h"
#include "gfx/gl/shaders/gs-shadowDynamicPointInstWithTextures.h"
+#include "gfx/gl/shaders/gs-shadowDynamicPointStencil.h"
#include "gfx/gl/shaders/vs-shadowDynamicPoint.h"
#include "gfx/gl/shaders/vs-shadowDynamicPointInst.h"
#include "gfx/gl/shaders/vs-shadowDynamicPointInstWithTextures.h"
+#include "gfx/gl/shaders/vs-shadowDynamicPointStencil.h"
#include "gfx/gl/shaders/vs-shadowLandmass.h"
+#include "gfx/gl/shadowStenciller.h"
+#include "gfx/lightDirection.h"
+#include "gfx/renderable.h"
#include "gl_traits.h"
#include "location.h"
#include "maths.h"
@@ -45,13 +52,15 @@ ShadowMapper::ShadowMapper(const TextureAbsCoord & s) :
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
-constexpr std::array<GlobalDistance, ShadowMapper::SHADOW_BANDS + 1> shadowBands {
- 1000,
- 250000,
- 750000,
- 2500000,
- 10000000,
-};
+constexpr auto shadowBands
+ = []<GlobalDistance... ints>(const float scaleFactor, std::integer_sequence<GlobalDistance, ints...>) {
+ const auto base = 10'000'000 / pow(scaleFactor, sizeof...(ints) - 1);
+ return std::array {1, static_cast<GlobalDistance>((base * pow(scaleFactor, ints)))...};
+ }(6.6F, std::make_integer_sequence<GlobalDistance, ShadowMapper::SHADOW_BANDS>());
+
+static_assert(shadowBands.front() == 1);
+static_assert(shadowBands.back() == 10'000'000);
+static_assert(shadowBands.size() == ShadowMapper::SHADOW_BANDS + 1);
std::vector<std::array<RelativePosition3D, 4>>
ShadowMapper::getBandViewExtents(const Camera & camera, const glm::mat4 & lightViewDir)
@@ -72,34 +81,49 @@ ShadowMapper::getBandViewExtents(const Camera & camera, const glm::mat4 & lightV
}
ShadowMapper::Definitions
-ShadowMapper::update(const SceneProvider & scene, const Direction3D & dir, const Camera & camera) const
+ShadowMapper::update(const SceneProvider & scene, const LightDirection & dir, const Camera & camera) const
{
+ glCullFace(GL_FRONT);
+ glEnable(GL_DEPTH_TEST);
+
+ shadowStenciller.setLightDirection(dir);
+ for (const auto & [id, asset] : gameState->assets) {
+ if (const auto r = std::dynamic_pointer_cast<const Renderable>(asset)) {
+ r->updateStencil(shadowStenciller);
+ }
+ }
+
glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
glClear(GL_DEPTH_BUFFER_BIT);
- glCullFace(GL_FRONT);
glViewport(0, 0, size.x, size.y);
- const auto lightViewDir = glm::lookAt({}, dir, up);
+ const auto lightViewDir = glm::lookAt({}, dir.vector(), up);
const auto lightViewPoint = camera.getPosition();
const auto bandViewExtents = getBandViewExtents(camera, lightViewDir);
Definitions out;
+ Sizes sizes;
std::transform(bandViewExtents.begin(), std::prev(bandViewExtents.end()), std::next(bandViewExtents.begin()),
std::back_inserter(out),
- [bands = bandViewExtents.size() - 2, &lightViewDir](const auto & near, const auto & far) mutable {
- const auto extents_minmax = [extents = std::span {near.begin(), far.end()}](auto && comp) {
- const auto mm = std::minmax_element(extents.begin(), extents.end(), comp);
- return std::make_pair(comp.get(*mm.first), comp.get(*mm.second));
- };
+ [bands = bandViewExtents.size() - 2, &lightViewDir, &sizes](const auto & near, const auto & far) mutable {
+ const auto extents_minmax
+ = [extents = std::span {near.begin(), far.end()}](auto && comp, RelativeDistance extra) {
+ const auto mm = std::minmax_element(extents.begin(), extents.end(), comp);
+ return std::make_pair(comp.get(*mm.first) - extra, comp.get(*mm.second) + extra);
+ };
+ const std::array extents = {extents_minmax(CompareBy {0}, 0), extents_minmax(CompareBy {1}, 0),
+ extents_minmax(CompareBy {2}, 10'000)};
const auto lightProjection = [](const auto & x, const auto & y, const auto & z) {
return glm::ortho(x.first, x.second, y.first, y.second, -z.second, -z.first);
- }(extents_minmax(CompareBy {0}), extents_minmax(CompareBy {1}), extents_minmax(CompareBy {2}));
+ }(extents[0], extents[1], extents[2]);
+ sizes.emplace_back(extents[0].second - extents[0].first, extents[1].second - extents[1].first,
+ extents[2].second - extents[2].first);
return lightProjection * lightViewDir;
});
for (const auto p : std::initializer_list<const ShadowProgram *> {
- &landmess, &dynamicPoint, &dynamicPointInst, &dynamicPointInstWithTextures}) {
- p->setView(out, lightViewPoint);
+ &landmess, &dynamicPoint, &dynamicPointInst, &dynamicPointInstWithTextures, &stencilShadowProgram}) {
+ p->setView(out, sizes, lightViewPoint);
}
scene.shadows(*this);
@@ -116,12 +140,15 @@ ShadowMapper::ShadowProgram::ShadowProgram(const Shader & vs, const Shader & gs,
}
void
-ShadowMapper::ShadowProgram::setView(
- const std::span<const glm::mat4> viewProjection, const GlobalPosition3D viewPoint) const
+ShadowMapper::ShadowProgram::setView(const std::span<const glm::mat4x4> viewProjection,
+ const std::span<const RelativePosition3D> sizes, const GlobalPosition3D viewPoint) const
{
use();
glUniform(viewPointLoc, viewPoint);
glUniform(viewProjectionLoc, viewProjection);
+ if (sizesLoc) {
+ glUniform(sizesLoc, sizes);
+ }
glUniform(viewProjectionsLoc, static_cast<GLint>(viewProjection.size()));
}
@@ -146,3 +173,16 @@ ShadowMapper::DynamicPoint::setModel(const Location & location) const
glUniform(modelLoc, location.getRotationTransform());
glUniform(modelPosLoc, location.pos);
}
+
+ShadowMapper::StencilShadowProgram::StencilShadowProgram() :
+ ShadowProgram {shadowDynamicPointStencil_vs, shadowDynamicPointStencil_gs, shadowDynamicPointStencil_fs}
+{
+}
+
+void
+ShadowMapper::StencilShadowProgram::use(const RelativePosition3D & centre, const float size) const
+{
+ Program::use();
+ glUniform(centreLoc, centre);
+ glUniform(sizeLoc, size);
+}
diff --git a/gfx/gl/shadowMapper.h b/gfx/gl/shadowMapper.h
index 73dadd0..951e29c 100644
--- a/gfx/gl/shadowMapper.h
+++ b/gfx/gl/shadowMapper.h
@@ -1,6 +1,7 @@
#pragma once
#include "config/types.h"
+#include "gfx/gl/shadowStenciller.h"
#include "lib/glArrays.h"
#include "program.h"
#include <gfx/models/texture.h>
@@ -10,6 +11,7 @@
class SceneProvider;
class Camera;
+class LightDirection;
class ShadowMapper {
public:
@@ -18,20 +20,23 @@ public:
static constexpr std::size_t SHADOW_BANDS {4};
using Definitions = std::vector<glm::mat4x4>;
+ using Sizes = std::vector<RelativePosition3D>;
- [[nodiscard]] Definitions update(const SceneProvider &, const Direction3D & direction, const Camera &) const;
+ [[nodiscard]] Definitions update(const SceneProvider &, const LightDirection & direction, const Camera &) const;
class ShadowProgram : public Program {
public:
explicit ShadowProgram(const Shader & vs);
explicit ShadowProgram(const Shader & vs, const Shader & gs, const Shader & fs);
- void setView(const std::span<const glm::mat4>, const GlobalPosition3D) const;
+ void setView(const std::span<const glm::mat4x4>, const std::span<const RelativePosition3D>,
+ const GlobalPosition3D) const;
void use() const;
private:
RequiredUniformLocation viewProjectionLoc {*this, "viewProjection"};
RequiredUniformLocation viewProjectionsLoc {*this, "viewProjections"};
+ UniformLocation sizesLoc {*this, "sizes"};
RequiredUniformLocation viewPointLoc {*this, "viewPoint"};
};
@@ -46,8 +51,19 @@ public:
RequiredUniformLocation modelPosLoc {*this, "modelPos"};
};
+ class StencilShadowProgram : public ShadowProgram {
+ public:
+ StencilShadowProgram();
+ void use(const RelativePosition3D & centre, const float size) const;
+
+ private:
+ RequiredUniformLocation centreLoc {*this, "centre"};
+ RequiredUniformLocation sizeLoc {*this, "size"};
+ };
+
ShadowProgram landmess, dynamicPointInst, dynamicPointInstWithTextures;
DynamicPoint dynamicPoint;
+ StencilShadowProgram stencilShadowProgram;
// NOLINTNEXTLINE(hicpp-explicit-conversions)
operator GLuint() const
@@ -61,4 +77,5 @@ private:
glFrameBuffer depthMapFBO;
glTexture depthMap;
TextureAbsCoord size;
+ mutable ShadowStenciller shadowStenciller;
};
diff --git a/gfx/gl/shadowStenciller.cpp b/gfx/gl/shadowStenciller.cpp
new file mode 100644
index 0000000..86b77e4
--- /dev/null
+++ b/gfx/gl/shadowStenciller.cpp
@@ -0,0 +1,74 @@
+#include "shadowStenciller.h"
+#include "gfx/gl/program.h"
+#include "gfx/gl/shaders/fs-shadowStencil.h"
+#include "gfx/gl/shaders/gs-shadowStencil.h"
+#include "gfx/gl/shaders/vs-shadowStencil.h"
+#include "gfx/lightDirection.h"
+#include "gfx/models/mesh.h"
+#include "glArrays.h"
+#include "gl_traits.h"
+#include "maths.h"
+#include <stdexcept>
+
+ShadowStenciller::ShadowStenciller() :
+ shadowCaster {shadowStencil_vs, shadowStencil_gs, shadowStencil_fs}, viewProjections {}
+{
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ glDrawBuffer(GL_NONE);
+ glReadBuffer(GL_NONE);
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+void
+ShadowStenciller::setLightDirection(const LightDirection & lightDir)
+{
+ viewProjections = [&lightDir]<GLint... Ep>(std::integer_sequence<GLint, Ep...>) {
+ constexpr float STEP = two_pi / STENCIL_ANGLES<decltype(two_pi)>;
+ return std::array {rotate_pitch<4>(half_pi - lightDir.position().y)
+ * rotate_yaw<4>((Ep * STEP) - lightDir.position().x)...};
+ }(std::make_integer_sequence<GLint, STENCIL_ANGLES<GLint>>());
+}
+
+glTexture
+ShadowStenciller::createStencilTexture(GLsizei width, GLsizei height)
+{
+ glTexture stencil;
+ glBindTexture(GL_TEXTURE_2D_ARRAY, stencil);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+ glTexParameter(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameter(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameter(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameter(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+ glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_DEPTH_COMPONENT, width, height, STENCIL_ANGLES<GLint>, 0,
+ GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, nullptr);
+
+ return stencil;
+}
+
+void
+ShadowStenciller::renderStencil(const glTexture & stencil, const MeshBase & mesh, const Texture::AnyPtr texture) const
+{
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, stencil, 0);
+ if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+ throw std::runtime_error("Stencil framebuffer not complete!");
+ }
+ if (texture) {
+ texture->bind();
+ }
+ glUseProgram(shadowCaster);
+ glClear(GL_DEPTH_BUFFER_BIT);
+ const auto stencilSize = Texture::getSize(stencil);
+ glViewport(0, 0, stencilSize.x, stencilSize.y);
+ const auto & centre = mesh.getDimensions().centre;
+ const auto & size = mesh.getDimensions().size;
+ glUniform(viewProjectionLoc,
+ std::span<const glm::mat4> {viewProjections *
+ [extentsMat = glm::translate(glm::ortho(-size, size, -size, size, -size, size), -centre)](
+ const auto & viewProjection) {
+ return viewProjection * extentsMat;
+ }});
+ mesh.Draw();
+}
diff --git a/gfx/gl/shadowStenciller.h b/gfx/gl/shadowStenciller.h
new file mode 100644
index 0000000..f774ac7
--- /dev/null
+++ b/gfx/gl/shadowStenciller.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include "gfx/gl/program.h"
+#include "gfx/models/mesh.h"
+#include "gfx/models/texture.h"
+#include "glArrays.h"
+
+class LightDirection;
+
+class ShadowStenciller {
+public:
+ template<typename T> static constexpr T STENCIL_ANGLES = 8;
+
+ ShadowStenciller();
+
+ [[nodiscard]]
+ static glTexture createStencilTexture(GLsizei width, GLsizei height);
+ void setLightDirection(const LightDirection & lightDir);
+ void renderStencil(const glTexture &, const MeshBase &, Texture::AnyPtr texture) const;
+
+private:
+ glFrameBuffer fbo;
+ Program shadowCaster;
+ Program::RequiredUniformLocation viewProjectionLoc {shadowCaster, "viewProjection"};
+
+ std::array<glm::mat4, STENCIL_ANGLES<size_t>> viewProjections;
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 11:41:36 +0000