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This commit is contained in:
Saikari
2026-02-20 02:53:20 +03:00
parent 0546272493
commit f363fa6f1a
1 changed files with 36 additions and 23 deletions
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59
examples/example_barycentric.cpp
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@@ -14,26 +14,32 @@ static const char* vertexShaderSource = R"(
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aColor;
layout (location = 2) in float aPointSize;
layout (location = 3) in float aIsLine;
out vec3 vColor;
out float vIsLine;
void main() {
gl_Position = vec4(aPos, 1.0);
vColor = aColor;
gl_PointSize = aPointSize;
vIsLine = aIsLine;
}
)";
static const char* fragmentShaderSource = R"(
#version 330 core
in vec3 vColor;
in float vIsLine;
out vec4 FragColor;
void main() {
// Calculate distance from center of the point
vec2 coord = gl_PointCoord - vec2(0.5);
if(length(coord) > 0.5)
discard;
if (vIsLine < 0.5) {
// Calculate distance from center of the point
vec2 coord = gl_PointCoord - vec2(0.5);
if(length(coord) > 0.5)
discard;
}
FragColor = vec4(vColor, 1.0);
}
@@ -61,10 +67,12 @@ void drawChar(char c, float x, float y, float scale, const Vector3<float>& color
lines.push_back(x + x1*w); lines.push_back(y + y1*h); lines.push_back(0.0f);
lines.push_back(color.x); lines.push_back(color.y); lines.push_back(color.z);
lines.push_back(1.0f); // size
lines.push_back(1.0f); // isLine
lines.push_back(x + x2*w); lines.push_back(y + y2*h); lines.push_back(0.0f);
lines.push_back(color.x); lines.push_back(color.y); lines.push_back(color.z);
lines.push_back(1.0f); // size
lines.push_back(1.0f); // isLine
};
switch(c) {
@@ -155,6 +163,7 @@ int main() {
pointCloud.push_back(P.x); pointCloud.push_back(P.y); pointCloud.push_back(P.z);
pointCloud.push_back(u); pointCloud.push_back(v); pointCloud.push_back(w);
pointCloud.push_back(2.0f); // size
pointCloud.push_back(0.0f); // isLine
}
}
}
@@ -165,25 +174,29 @@ int main() {
glBindVertexArray(VAO_cloud);
glBindBuffer(GL_ARRAY_BUFFER, VBO_cloud);
glBufferData(GL_ARRAY_BUFFER, pointCloud.size() * sizeof(float), pointCloud.data(), GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)(3 * sizeof(float)));
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)(6 * sizeof(float)));
glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(3, 1, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(7 * sizeof(float)));
glEnableVertexAttribArray(3);
GLuint VAO_dyn, VBO_dyn;
glGenVertexArrays(1, &VAO_dyn);
glGenBuffers(1, &VBO_dyn);
glBindVertexArray(VAO_dyn);
glBindBuffer(GL_ARRAY_BUFFER, VBO_dyn);
glBufferData(GL_ARRAY_BUFFER, 1000 * 7 * sizeof(float), NULL, GL_DYNAMIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)0);
glBufferData(GL_ARRAY_BUFFER, 1000 * 8 * sizeof(float), NULL, GL_DYNAMIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)(3 * sizeof(float)));
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)(6 * sizeof(float)));
glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(3, 1, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(7 * sizeof(float)));
glEnableVertexAttribArray(3);
glEnable(GL_PROGRAM_POINT_SIZE);
glEnable(GL_BLEND);
@@ -197,7 +210,7 @@ int main() {
// Draw the point cloud (the iterated points)
glBindVertexArray(VAO_cloud);
glDrawArrays(GL_POINTS, 0, pointCloud.size() / 7);
glDrawArrays(GL_POINTS, 0, pointCloud.size() / 8);
// Animate the white dot to simulate dragging
float t = glfwGetTime();
@@ -231,22 +244,22 @@ int main() {
std::vector<float> dynData = {
// Lines from P to A, B, C
P.x, P.y, P.z, u, v, w, 1.0f,
A.x, A.y, A.z, 1.0f, 0.0f, 0.0f, 1.0f,
P.x, P.y, P.z, u, v, w, 1.0f, 1.0f,
A.x, A.y, A.z, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
P.x, P.y, P.z, u, v, w, 1.0f,
B.x, B.y, B.z, 0.0f, 1.0f, 0.0f, 1.0f,
P.x, P.y, P.z, u, v, w, 1.0f, 1.0f,
B.x, B.y, B.z, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,
P.x, P.y, P.z, u, v, w, 1.0f,
C.x, C.y, C.z, 0.0f, 0.0f, 1.0f, 1.0f,
P.x, P.y, P.z, u, v, w, 1.0f, 1.0f,
C.x, C.y, C.z, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
// The animated dot itself (White)
P.x, P.y, P.z, 1.0f, 1.0f, 1.0f, sizeP,
P.x, P.y, P.z, 1.0f, 1.0f, 1.0f, sizeP, 0.0f,
// The 3 corner dots
A.x, A.y, A.z, 1.0f, 0.0f, 0.0f, sizeA,
B.x, B.y, B.z, 0.0f, 1.0f, 0.0f, sizeB,
C.x, C.y, C.z, 0.0f, 0.0f, 1.0f, sizeC
A.x, A.y, A.z, 1.0f, 0.0f, 0.0f, sizeA, 0.0f,
B.x, B.y, B.z, 0.0f, 1.0f, 0.0f, sizeB, 0.0f,
C.x, C.y, C.z, 0.0f, 0.0f, 1.0f, sizeC, 0.0f
};
char bufA[16], bufB[16], bufC[16];
@@ -271,7 +284,7 @@ int main() {
glDrawArrays(GL_LINES, 0, 6);
// Draw text lines
int numTextVertices = (dynData.size() / 7) - 10;
int numTextVertices = (dynData.size() / 8) - 10;
if (numTextVertices > 0) {
glDrawArrays(GL_LINES, 10, numTextVertices);
}