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examples_model_decals : Fixed unload crash, added buttons (#5306)

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themushroompirates
2025-10-26 18:15:45 +01:00
committed by GitHub
parent a818508158
commit e244cf297a
2 changed files with 283 additions and 214 deletions
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495
examples/models/models_decals.c
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@@ -43,8 +43,10 @@ typedef struct MeshBuilder {
static void AddTriangleToMeshBuilder(MeshBuilder *mb, Vector3 vertices[3]); static void AddTriangleToMeshBuilder(MeshBuilder *mb, Vector3 vertices[3]);
static void FreeMeshBuilder(MeshBuilder *mb); static void FreeMeshBuilder(MeshBuilder *mb);
static Mesh BuildMesh(MeshBuilder *mb); static Mesh BuildMesh(MeshBuilder *mb);
static Mesh GenMeshDecal(Mesh inputMesh, Ray ray); static Mesh GenMeshDecal(Model inputModel, Matrix projection, float decalSize, float decalOffset);
static Vector3 ClipSegment(Vector3 v0, Vector3 v1, Vector3 p, float s); static Vector3 ClipSegment(Vector3 v0, Vector3 v1, Vector3 p, float s);
#define FreeDecalMeshData() GenMeshDecal((Model){ .meshCount = -1.0f }, (Matrix){ 0 }, 0.0f, 0.0f)
static bool Button(Rectangle rec, char *label);
//------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------
// Program main entry point // Program main entry point
@@ -105,10 +107,6 @@ int main(void)
decalMaterial.maps[MATERIAL_MAP_DIFFUSE].texture = decalTexture; decalMaterial.maps[MATERIAL_MAP_DIFFUSE].texture = decalTexture;
decalMaterial.maps[MATERIAL_MAP_DIFFUSE].color = RAYWHITE; decalMaterial.maps[MATERIAL_MAP_DIFFUSE].color = RAYWHITE;
// We're going to use these to build up our decal meshes
// They'll resize automatically as we go, we'll free them at the end
MeshBuilder meshBuilders[2] = { 0 };
bool showModel = true; bool showModel = true;
Model decalModels[MAX_DECALS] = { 0 }; Model decalModels[MAX_DECALS] = { 0 };
int decalCount = 0; int decalCount = 0;
@@ -123,8 +121,6 @@ int main(void)
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT)) UpdateCamera(&camera, CAMERA_THIRD_PERSON); if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT)) UpdateCamera(&camera, CAMERA_THIRD_PERSON);
if (IsKeyPressed(KEY_SPACE)) showModel = !showModel;
// Display information about closest hit // Display information about closest hit
RayCollision collision = { 0 }; RayCollision collision = { 0 };
collision.distance = FLT_MAX; collision.distance = FLT_MAX;
@@ -165,206 +161,12 @@ int main(void)
// Spin the placement around a bit // Spin the placement around a bit
splat = MatrixMultiply(splat, MatrixRotateZ(DEG2RAD*((float)GetRandomValue(-180, 180)))); splat = MatrixMultiply(splat, MatrixRotateZ(DEG2RAD*((float)GetRandomValue(-180, 180))));
Matrix splatInv = MatrixInvert(splat);
// Reset the mesh builders Mesh decalMesh = GenMeshDecal(model, splat, decalSize, decalOffset);
meshBuilders[0].vertexCount = 0; if (decalMesh.vertexCount > 0) {
meshBuilders[1].vertexCount = 0;
// We'll be flip-flopping between the two mesh builders
// Reading from one and writing to the other, then swapping
int mbIndex = 0;
// First pass, just get any triangle inside the bounding box (for each mesh of the model)
for (int meshIndex = 0; meshIndex < model.meshCount; meshIndex++)
{
Mesh mesh = model.meshes[meshIndex];
for (int tri = 0; tri < mesh.triangleCount; tri++)
{
Vector3 vertices[3] = { 0 };
// The way we calculate the vertices of the mesh triangle
// depend on whether the mesh vertices are indexed or not
if (mesh.indices == 0)
{
for (int v = 0; v < 3; v++)
{
vertices[v] = (Vector3){
mesh.vertices[3*3*tri + 3*v + 0],
mesh.vertices[3*3*tri + 3*v + 1],
mesh.vertices[3*3*tri + 3*v + 2]
};
}
}
else
{
for (int v = 0; v < 3; v++)
{
vertices[v] = (Vector3){
mesh.vertices[ 3*mesh.indices[3*tri+0] + v],
mesh.vertices[ 3*mesh.indices[3*tri+1] + v],
mesh.vertices[ 3*mesh.indices[3*tri+2] + v]
};
}
}
// Transform all 3 vertices of the triangle
// and check if they are inside our decal box
int insideCount = 0;
for (int i = 0; i < 3; i++)
{
// To splat space
Vector3 v = Vector3Transform(vertices[i], splat);
if ((fabsf(v.x) < decalSize) || (fabsf(v.y) <= decalSize) || (fabsf(v.z) <= decalSize)) insideCount++;
// We need to keep the transformed vertex
vertices[i] = v;
}
// If any of them are inside, we add the triangle - we'll clip it later
if (insideCount > 0) AddTriangleToMeshBuilder(&meshBuilders[mbIndex], vertices);
}
}
// Clipping time! We need to clip against all 6 directions
Vector3 planes[6] = {
{ 1, 0, 0 },
{ -1, 0, 0 },
{ 0, 1, 0 },
{ 0, -1, 0 },
{ 0, 0, 1 },
{ 0, 0, -1 }
};
for (int face = 0; face < 6; face++)
{
// Swap current model builder (so we read from the one we just wrote to)
mbIndex = 1 - mbIndex;
MeshBuilder *inMesh = &meshBuilders[1 - mbIndex];
MeshBuilder *outMesh = &meshBuilders[mbIndex];
// Reset write builder
outMesh->vertexCount = 0;
float s = 0.5f*decalSize;
for (int i = 0; i < inMesh->vertexCount; i += 3)
{
Vector3 nV1, nV2, nV3, nV4;
float d1 = Vector3DotProduct(inMesh->vertices[ i + 0 ], planes[face] ) - s;
float d2 = Vector3DotProduct(inMesh->vertices[ i + 1 ], planes[face] ) - s;
float d3 = Vector3DotProduct(inMesh->vertices[ i + 2 ], planes[face] ) - s;
int v1Out = (d1 > 0);
int v2Out = (d2 > 0);
int v3Out = (d3 > 0);
// Calculate, how many vertices of the face lie outside of the clipping plane
int total = v1Out + v2Out + v3Out;
switch (total)
{
case 0:
{
// The entire face lies inside of the plane, no clipping needed
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){inMesh->vertices[i], inMesh->vertices[i+1], inMesh->vertices[i+2]});
} break;
case 1:
{
// One vertex lies outside of the plane, perform clipping
if (v1Out)
{
nV1 = inMesh->vertices[i + 1];
nV2 = inMesh->vertices[i + 2];
nV3 = ClipSegment(inMesh->vertices[i], nV1, planes[face], s);
nV4 = ClipSegment(inMesh->vertices[i], nV2, planes[face], s);
}
if (v2Out)
{
nV1 = inMesh->vertices[i];
nV2 = inMesh->vertices[i + 2];
nV3 = ClipSegment(inMesh->vertices[i + 1], nV1, planes[face], s);
nV4 = ClipSegment(inMesh->vertices[i + 1], nV2, planes[face], s);
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV3, nV2, nV1});
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV2, nV3, nV4});
break;
}
if (v3Out)
{
nV1 = inMesh->vertices[i];
nV2 = inMesh->vertices[i + 1];
nV3 = ClipSegment(inMesh->vertices[i + 2], nV1, planes[face], s);
nV4 = ClipSegment(inMesh->vertices[i + 2], nV2, planes[face], s);
}
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV1, nV2, nV3});
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV4, nV3, nV2});
} break;
case 2:
{
// Two vertices lies outside of the plane, perform clipping
if (!v1Out)
{
nV1 = inMesh->vertices[i];
nV2 = ClipSegment(nV1, inMesh->vertices[i + 1], planes[face], s);
nV3 = ClipSegment(nV1, inMesh->vertices[i + 2], planes[face], s);
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV1, nV2, nV3});
}
if (!v2Out)
{
nV1 = inMesh->vertices[i + 1];
nV2 = ClipSegment(nV1, inMesh->vertices[i + 2], planes[face], s);
nV3 = ClipSegment(nV1, inMesh->vertices[i], planes[face], s);
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV1, nV2, nV3});
}
if (!v3Out)
{
nV1 = inMesh->vertices[i + 2];
nV2 = ClipSegment(nV1, inMesh->vertices[i], planes[face], s);
nV3 = ClipSegment(nV1, inMesh->vertices[i + 1], planes[face], s);
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV1, nV2, nV3});
}
} break;
case 3: // The entire face lies outside of the plane, so let's discard the corresponding vertices
default: break;
}
}
}
// Now we just need to re-transform the vertices
MeshBuilder *theMesh = &meshBuilders[mbIndex];
// Allocate room for UVs
if (theMesh->vertexCount > 0)
{
theMesh->uvs = (Vector2 *)MemAlloc(sizeof(Vector2)*theMesh->vertexCount);
for (int i = 0; i < theMesh->vertexCount; i++)
{
// Calculate the UVs based on the projected coords
// They are clipped to (-decalSize .. decalSize) and we want them (0..1)
theMesh->uvs[i].x = (theMesh->vertices[i].x/decalSize + 0.5f);
theMesh->uvs[i].y = (theMesh->vertices[i].y/decalSize + 0.5f);
// From splat space to world space
theMesh->vertices[i] = Vector3Transform(theMesh->vertices[i], splatInv);
// Tiny nudge in the normal direction so it renders properly over the mesh
theMesh->vertices[i] = Vector3Add(theMesh->vertices[i], Vector3Scale(collision.normal, decalOffset));
}
// Decal model data ready, create it and add it
int decalIndex = decalCount++; int decalIndex = decalCount++;
decalModels[decalIndex] = LoadModelFromMesh(BuildMesh(theMesh)); decalModels[decalIndex] = LoadModelFromMesh(decalMesh);
decalModels[decalIndex].materials[0] = decalMaterial; decalModels[decalIndex].materials[0].maps[0] = decalMaterial.maps[0];
} }
} }
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
@@ -418,13 +220,20 @@ int main(void)
for (int i = 0; i < decalCount; i++) for (int i = 0; i < decalCount; i++)
{ {
DrawText(TextFormat("Decal #%d", i+1), x0, yPos, 10, LIME); if (i == 20) {
DrawText(TextFormat("%d", decalModels[i].meshes[0].vertexCount), x1, yPos, 10, LIME); DrawText("...", x0, yPos, 10, LIME);
DrawText(TextFormat("%d", decalModels[i].meshes[0].triangleCount), x2, yPos, 10, LIME); yPos += 15;
}
if (i < 20) {
DrawText(TextFormat("Decal #%d", i+1), x0, yPos, 10, LIME);
DrawText(TextFormat("%d", decalModels[i].meshes[0].vertexCount), x1, yPos, 10, LIME);
DrawText(TextFormat("%d", decalModels[i].meshes[0].triangleCount), x2, yPos, 10, LIME);
yPos += 15;
}
vertexCount += decalModels[i].meshes[0].vertexCount; vertexCount += decalModels[i].meshes[0].vertexCount;
triangleCount += decalModels[i].meshes[0].triangleCount; triangleCount += decalModels[i].meshes[0].triangleCount;
yPos += 15;
} }
DrawText("TOTAL", x0, yPos, 10, LIME); DrawText("TOTAL", x0, yPos, 10, LIME);
@@ -435,6 +244,23 @@ int main(void)
DrawText("Hold RMB to move camera", 10, 430, 10, GRAY); DrawText("Hold RMB to move camera", 10, 430, 10, GRAY);
DrawText("(c) Character model and texture from kenney.nl", screenWidth - 260, screenHeight - 20, 10, GRAY); DrawText("(c) Character model and texture from kenney.nl", screenWidth - 260, screenHeight - 20, 10, GRAY);
Rectangle rect = (Rectangle){ 10, screenHeight - 100, 100, 60 };
if (Button(rect, showModel ? "Hide Model" : "Show Model")) {
showModel = !showModel;
}
rect.x += rect.width + 10;
if (Button(rect, "Clear Decals")) {
for (int i = 0; i < decalCount; i++)
{
UnloadModel(decalModels[i]);
}
decalCount = 0;
}
DrawFPS(10, 10); DrawFPS(10, 10);
EndDrawing(); EndDrawing();
@@ -446,13 +272,14 @@ int main(void)
UnloadModel(model); UnloadModel(model);
UnloadTexture(modelTexture); UnloadTexture(modelTexture);
// TODO: WARNING: This line crashes program on closing for (int i = 0; i < decalCount; i++) {
//for (int i = 0; i < decalCount; i++) UnloadModel(decalModels[i]); UnloadModel(decalModels[i]);
}
UnloadTexture(decalTexture); UnloadTexture(decalTexture);
FreeMeshBuilder(&meshBuilders[0]); // Free the data for decal generation
FreeMeshBuilder(&meshBuilders[1]); FreeDecalMeshData();
CloseWindow(); // Close window and OpenGL context CloseWindow(); // Close window and OpenGL context
//-------------------------------------------------------------------------------------- //--------------------------------------------------------------------------------------
@@ -536,3 +363,245 @@ static Vector3 ClipSegment(Vector3 v0, Vector3 v1, Vector3 p, float s)
return position; return position;
} }
static Mesh GenMeshDecal(Model inputModel, Matrix projection, float decalSize, float decalOffset)
{
// We're going to use these to build up our decal meshes
// They'll resize automatically as we go, we'll free them at the end
static MeshBuilder meshBuilders[2] = { 0 };
// Ugly way of telling us to free the static MeshBuilder data
if (inputModel.meshCount == -1) {
FreeMeshBuilder(&meshBuilders[0]);
FreeMeshBuilder(&meshBuilders[1]);
return (Mesh){0};
}
// We're going to need the inverse matrix
Matrix invProj = MatrixInvert(projection);
// Reset the mesh builders
meshBuilders[0].vertexCount = 0;
meshBuilders[1].vertexCount = 0;
// We'll be flip-flopping between the two mesh builders
// Reading from one and writing to the other, then swapping
int mbIndex = 0;
// First pass, just get any triangle inside the bounding box (for each mesh of the model)
for (int meshIndex = 0; meshIndex < inputModel.meshCount; meshIndex++)
{
Mesh mesh = inputModel.meshes[meshIndex];
for (int tri = 0; tri < mesh.triangleCount; tri++)
{
Vector3 vertices[3] = { 0 };
// The way we calculate the vertices of the mesh triangle
// depend on whether the mesh vertices are indexed or not
if (mesh.indices == 0)
{
for (int v = 0; v < 3; v++)
{
vertices[v] = (Vector3){
mesh.vertices[3*3*tri + 3*v + 0],
mesh.vertices[3*3*tri + 3*v + 1],
mesh.vertices[3*3*tri + 3*v + 2]
};
}
}
else
{
for (int v = 0; v < 3; v++)
{
vertices[v] = (Vector3){
mesh.vertices[ 3*mesh.indices[3*tri+0] + v],
mesh.vertices[ 3*mesh.indices[3*tri+1] + v],
mesh.vertices[ 3*mesh.indices[3*tri+2] + v]
};
}
}
// Transform all 3 vertices of the triangle
// and check if they are inside our decal box
int insideCount = 0;
for (int i = 0; i < 3; i++)
{
// To projection space
Vector3 v = Vector3Transform(vertices[i], projection);
if ((fabsf(v.x) < decalSize) || (fabsf(v.y) <= decalSize) || (fabsf(v.z) <= decalSize)) insideCount++;
// We need to keep the transformed vertex
vertices[i] = v;
}
// If any of them are inside, we add the triangle - we'll clip it later
if (insideCount > 0) AddTriangleToMeshBuilder(&meshBuilders[mbIndex], vertices);
}
}
// Clipping time! We need to clip against all 6 directions
Vector3 planes[6] = {
{ 1, 0, 0 },
{ -1, 0, 0 },
{ 0, 1, 0 },
{ 0, -1, 0 },
{ 0, 0, 1 },
{ 0, 0, -1 }
};
for (int face = 0; face < 6; face++)
{
// Swap current model builder (so we read from the one we just wrote to)
mbIndex = 1 - mbIndex;
MeshBuilder *inMesh = &meshBuilders[1 - mbIndex];
MeshBuilder *outMesh = &meshBuilders[mbIndex];
// Reset write builder
outMesh->vertexCount = 0;
float s = 0.5f*decalSize;
for (int i = 0; i < inMesh->vertexCount; i += 3)
{
Vector3 nV1, nV2, nV3, nV4;
float d1 = Vector3DotProduct(inMesh->vertices[ i + 0 ], planes[face] ) - s;
float d2 = Vector3DotProduct(inMesh->vertices[ i + 1 ], planes[face] ) - s;
float d3 = Vector3DotProduct(inMesh->vertices[ i + 2 ], planes[face] ) - s;
int v1Out = (d1 > 0);
int v2Out = (d2 > 0);
int v3Out = (d3 > 0);
// Calculate, how many vertices of the face lie outside of the clipping plane
int total = v1Out + v2Out + v3Out;
switch (total)
{
case 0:
{
// The entire face lies inside of the plane, no clipping needed
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){inMesh->vertices[i], inMesh->vertices[i+1], inMesh->vertices[i+2]});
} break;
case 1:
{
// One vertex lies outside of the plane, perform clipping
if (v1Out)
{
nV1 = inMesh->vertices[i + 1];
nV2 = inMesh->vertices[i + 2];
nV3 = ClipSegment(inMesh->vertices[i], nV1, planes[face], s);
nV4 = ClipSegment(inMesh->vertices[i], nV2, planes[face], s);
}
if (v2Out)
{
nV1 = inMesh->vertices[i];
nV2 = inMesh->vertices[i + 2];
nV3 = ClipSegment(inMesh->vertices[i + 1], nV1, planes[face], s);
nV4 = ClipSegment(inMesh->vertices[i + 1], nV2, planes[face], s);
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV3, nV2, nV1});
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV2, nV3, nV4});
break;
}
if (v3Out)
{
nV1 = inMesh->vertices[i];
nV2 = inMesh->vertices[i + 1];
nV3 = ClipSegment(inMesh->vertices[i + 2], nV1, planes[face], s);
nV4 = ClipSegment(inMesh->vertices[i + 2], nV2, planes[face], s);
}
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV1, nV2, nV3});
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV4, nV3, nV2});
} break;
case 2:
{
// Two vertices lies outside of the plane, perform clipping
if (!v1Out)
{
nV1 = inMesh->vertices[i];
nV2 = ClipSegment(nV1, inMesh->vertices[i + 1], planes[face], s);
nV3 = ClipSegment(nV1, inMesh->vertices[i + 2], planes[face], s);
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV1, nV2, nV3});
}
if (!v2Out)
{
nV1 = inMesh->vertices[i + 1];
nV2 = ClipSegment(nV1, inMesh->vertices[i + 2], planes[face], s);
nV3 = ClipSegment(nV1, inMesh->vertices[i], planes[face], s);
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV1, nV2, nV3});
}
if (!v3Out)
{
nV1 = inMesh->vertices[i + 2];
nV2 = ClipSegment(nV1, inMesh->vertices[i], planes[face], s);
nV3 = ClipSegment(nV1, inMesh->vertices[i + 1], planes[face], s);
AddTriangleToMeshBuilder(outMesh, (Vector3[3]){nV1, nV2, nV3});
}
} break;
case 3: // The entire face lies outside of the plane, so let's discard the corresponding vertices
default: break;
}
}
}
// Now we just need to re-transform the vertices
MeshBuilder *theMesh = &meshBuilders[mbIndex];
// Allocate room for UVs
if (theMesh->vertexCount > 0)
{
theMesh->uvs = (Vector2 *)MemAlloc(sizeof(Vector2)*theMesh->vertexCount);
for (int i = 0; i < theMesh->vertexCount; i++)
{
// Calculate the UVs based on the projected coords
// They are clipped to (-decalSize .. decalSize) and we want them (0..1)
theMesh->uvs[i].x = (theMesh->vertices[i].x/decalSize + 0.5f);
theMesh->uvs[i].y = (theMesh->vertices[i].y/decalSize + 0.5f);
// Tiny nudge in the normal direction so it renders properly over the mesh
theMesh->vertices[i].z -= decalOffset;
// From projection space to world space
theMesh->vertices[i] = Vector3Transform(theMesh->vertices[i], invProj);
}
// Decal model data ready, create the mesh and return it
return BuildMesh(theMesh);
}
else
{
// Return a blank mesh as there's nothing to add
return (Mesh){ 0 };
}
}
static bool Button(Rectangle rec, char *label)
{
Color bgColor = GRAY;
bool pressed = false;
if (CheckCollisionPointRec(GetMousePosition(), rec)) {
bgColor = LIGHTGRAY;
if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
pressed = true;
}
}
DrawRectangleRec(rec, bgColor);
DrawRectangleLinesEx(rec, 2.0f, DARKGRAY);
float fontSize = 10.0f;
float textWidth = MeasureText(label, fontSize);
DrawText(label, (int)(rec.x + rec.width*0.5f - textWidth*0.5f), (int)(rec.y + rec.height*0.5f - fontSize*0.5f), fontSize, DARKGRAY);
return pressed;
}

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