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Dynamic tessellation based on slope 

TODO normals do not reflect slope tessellation
This commit is contained in:
Jack 2024-08-28 22:24:23 -04:00
parent 9fa18ac69e
commit 85533814e1
4 changed files with 39 additions and 15 deletions
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10
imgui.ini
View File

@ -30,20 +30,20 @@ DockId=0x00000003,0
[Window][Viewport]
Pos=0,34
Size=2134,1641
Size=2178,1641
Collapsed=0
DockId=0x00000003,0
[Window][Scene Settings]
Pos=2137,34
Size=743,1641
Pos=2181,34
Size=699,1641
Collapsed=0
DockId=0x00000004,0
[Docking][Data]
DockSpace ID=0x6F42A598 Window=0xE80F322C Pos=0,34 Size=2880,1641 Split=X Selected=0x9F2D9299
DockNode ID=0x00000001 Parent=0x6F42A598 SizeRef=0,0 Split=X Selected=0x13926F0B
DockNode ID=0x00000003 Parent=0x00000001 SizeRef=2134,701 CentralNode=1 Selected=0x13926F0B
DockNode ID=0x00000004 Parent=0x00000001 SizeRef=743,701 Selected=0x413E6147
DockNode ID=0x00000003 Parent=0x00000001 SizeRef=578,701 CentralNode=1 Selected=0x13926F0B
DockNode ID=0x00000004 Parent=0x00000001 SizeRef=699,701 Selected=0x413E6147
DockNode ID=0x00000002 Parent=0x6F42A598 SizeRef=419,701 Selected=0xF69494A7

36
shaders/tessellation_ctrl.glsl
View File

@ -26,19 +26,43 @@ out TC_OUT {
vec2 texCoord;
} tc_out[];
float getHeight(vec2 uv) {
return texture(heightTexture, uv).r * displacementScale;
}
float calculateSlope() {
float step = 1.0f / (float(gridDensity) * maxTessellation + 1.0f);
// Find surrounding heights
float hLeft = getHeight(tc_in[gl_InvocationID].texCoord + vec2(-step, 0.0f));
float hRight = getHeight(tc_in[gl_InvocationID].texCoord + vec2(step, 0.0f));
float hUp = getHeight(tc_in[gl_InvocationID].texCoord + vec2(0.0f, step));
float hDown = getHeight(tc_in[gl_InvocationID].texCoord + vec2(0.0f, -step));
float slopeX = abs(hLeft - hRight);
float slopeY = abs(hUp - hDown);
float maxSlope = max(slopeX, slopeY);
return maxSlope;
}
void main() {
// Pass through position and texture coordinates to the tessellation evaluation shader
tc_out[gl_InvocationID].position = tc_in[gl_InvocationID].position;
tc_out[gl_InvocationID].texCoord = tc_in[gl_InvocationID].texCoord;
float slope = calculateSlope();
float tessLevel = tessellationFactor * (1.0f + slope * 10.0f);
// Set tessellation levels
if (gl_InvocationID == 0) {
gl_TessLevelOuter[0] = maxTessellation;
gl_TessLevelOuter[1] = maxTessellation;
gl_TessLevelOuter[2] = maxTessellation;
gl_TessLevelOuter[3] = maxTessellation;
gl_TessLevelOuter[0] = tessLevel;
gl_TessLevelOuter[1] = tessLevel;
gl_TessLevelOuter[2] = tessLevel;
gl_TessLevelOuter[3] = tessLevel;
gl_TessLevelInner[0] = maxTessellation;
gl_TessLevelInner[1] = maxTessellation;
gl_TessLevelInner[0] = tessLevel;
gl_TessLevelInner[1] = tessLevel;
}
}

1
source/interface.cpp
View File

@ -20,7 +20,6 @@ void ApplyUIScaling(GLFWwindow* window) {
ImGuiIO& io = ImGui::GetIO();
io.Fonts->Clear();
std::cout << "Current Path: " << std::filesystem::current_path() << std::endl;
#ifdef _WIN32
io.Fonts->AddFontFromFileTTF("imgui/misc/fonts/JetBrainsMono/JetBrainsMono-Medium.ttf", 8.0f * scale);

7
source/scene.cpp
View File

@ -240,8 +240,7 @@ void Scene::Display(GLFWwindow* window) {
glUseProgram(shader_program_);
//glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
// glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
Window* viewport = Interface::GetWindowByName(windows_, "Viewport");
if (viewport && viewport->size.x > 0 && viewport->size.y > 0) {
@ -270,7 +269,9 @@ void Scene::Display(GLFWwindow* window) {
glPatchParameteri(GL_PATCH_VERTICES, 4);
glDrawElements(GL_PATCHES, indices.size(), GL_UNSIGNED_INT, 0);
//glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
FBO::Unbind();
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
FBO::Bind(lht_fbo_);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);