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authorDan Goodliffe <dan@randomdan.homeip.net>2024-08-28 03:48:19 +0100
committerDan Goodliffe <dan@randomdan.homeip.net>2024-08-28 03:48:19 +0100
commitae9087aea7aa2b19bf78daa6593d14dfba98183d (patch)
tree0263fd2580239c9ac55a4cc775b2a3c3e3f14eb7
parentSet stencil texture min/mag filters (diff)
downloadilt-ae9087aea7aa2b19bf78daa6593d14dfba98183d.tar.bz2
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Initial cut of shadow map creation with support for billboard shadows
-rw-r--r--gfx/gl/shaders/shadowDynamicPointStencil.fs16
-rw-r--r--gfx/gl/shaders/shadowDynamicPointStencil.gs32
-rw-r--r--gfx/gl/shaders/shadowDynamicPointStencil.vs17
-rw-r--r--gfx/gl/shadowMapper.cpp18
-rw-r--r--gfx/gl/shadowMapper.h11
5 files changed, 93 insertions, 1 deletions
diff --git a/gfx/gl/shaders/shadowDynamicPointStencil.fs b/gfx/gl/shaders/shadowDynamicPointStencil.fs
new file mode 100644
index 0000000..57b8aa3
--- /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 sampler2D stencilDepth;
+flat in vec3 scale;
+in vec2 texCoord;
+
+void
+main()
+{
+ float stDepth = texture(stencilDepth, texCoord).r;
+ if (stDepth >= 1) {
+ discard;
+ }
+ gl_FragDepth = gl_FragCoord.z + (stDepth * scale.z);
+}
diff --git a/gfx/gl/shaders/shadowDynamicPointStencil.gs b/gfx/gl/shaders/shadowDynamicPointStencil.gs
new file mode 100644
index 0000000..6d707ae
--- /dev/null
+++ b/gfx/gl/shaders/shadowDynamicPointStencil.gs
@@ -0,0 +1,32 @@
+#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));
+
+uniform mat4 viewProjection[4];
+uniform int viewProjections;
+uniform vec3 sizes[4];
+uniform float size;
+
+in ivec3 vworldPos[];
+
+flat out vec3 scale;
+out vec2 texCoord;
+
+layout(points) in;
+layout(triangle_strip, max_vertices = 16) out;
+
+void
+main()
+{
+ 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);
+ texCoord = (corners[c] * 0.5) + 0.5;
+ EmitVertex();
+ }
+ EndPrimitive();
+ }
+}
diff --git a/gfx/gl/shaders/shadowDynamicPointStencil.vs b/gfx/gl/shaders/shadowDynamicPointStencil.vs
new file mode 100644
index 0000000..dadf9c2
--- /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 mat3 model;
+layout(location = 3) in ivec3 worldPos;
+uniform ivec3 viewPoint;
+uniform vec3 centre;
+
+out mat3 vmodel;
+out ivec3 vworldPos;
+
+void
+main()
+{
+ vmodel = model;
+ vworldPos = worldPos - viewPoint + ivec3(centre);
+}
diff --git a/gfx/gl/shadowMapper.cpp b/gfx/gl/shadowMapper.cpp
index 177bd22..ac161e2 100644
--- a/gfx/gl/shadowMapper.cpp
+++ b/gfx/gl/shadowMapper.cpp
@@ -3,11 +3,14 @@
#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/renderable.h"
@@ -115,7 +118,7 @@ ShadowMapper::update(const SceneProvider & scene, const Direction3D & dir, const
return lightProjection * lightViewDir;
});
for (const auto p : std::initializer_list<const ShadowProgram *> {
- &landmess, &dynamicPoint, &dynamicPointInst, &dynamicPointInstWithTextures}) {
+ &landmess, &dynamicPoint, &dynamicPointInst, &dynamicPointInstWithTextures, &stencilShadowProgram}) {
p->setView(out, sizes, lightViewPoint);
}
scene.shadows(*this);
@@ -166,3 +169,16 @@ 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 19c3d23..3aa224e 100644
--- a/gfx/gl/shadowMapper.h
+++ b/gfx/gl/shadowMapper.h
@@ -50,8 +50,19 @@ 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