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added mats, updated gradient, updated bmp.

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Yggdrasil75
2025-11-05 14:05:23 -05:00
parent 5a0d81134e
commit 6c6e420507
9 changed files with 839 additions and 67 deletions
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100
main.cpp
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@@ -41,76 +41,41 @@ int main(int argc, char* argv[]) {
Grid2 grid;
// Define our target colors at specific positions
Vec4 red = hexToVec4("ff0000"); // Top-left corner
Vec4 green = hexToVec4("00ff00"); // Center
Vec4 blue = hexToVec4("0000ff"); // Bottom-right corner
Vec4 white = hexToVec4("ffffff"); // Top-right corner
Vec4 black = hexToVec4("000000"); // Bottom-left corner
Vec4 white = hexToVec4("ffffff"); // Top-left corner (1,1)
Vec4 red = hexToVec4("ff0000"); // Top-right corner (1,-1)
Vec4 green = hexToVec4("00ff00"); // Center (0,0)
Vec4 blue = hexToVec4("0000ff"); // Bottom-left corner (-1,-1)
Vec4 black = hexToVec4("000000"); // Bottom-right corner (-1,1)
// Create gradient points
for (int y = 0; y < POINTS_PER_DIM; ++y) {
for (int x = 0; x < POINTS_PER_DIM; ++x) {
// Normalize coordinates to [0, 1]
float nx = static_cast<float>(x) / (POINTS_PER_DIM - 1);
float ny = static_cast<float>(y) / (POINTS_PER_DIM - 1);
// Normalize coordinates to [-1, 1]
float nx = (static_cast<float>(x) / (POINTS_PER_DIM - 1)) * 2.0f - 1.0f;
float ny = (static_cast<float>(y) / (POINTS_PER_DIM - 1)) * 2.0f - 1.0f;
// Create position in [-1, 1] range
Vec2 pos(nx * 2.0f - 1.0f, ny * 2.0f - 1.0f);
// Create position
Vec2 pos(nx, ny);
// Calculate interpolated color based on position
Vec4 color;
// Calculate weights for each corner based on distance
// We'll use bilinear interpolation
if (nx + ny <= 1.0f) {
// Lower triangle: interpolate between red, green, and black
if (nx <= 0.5f && ny <= 0.5f) {
// Bottom-left quadrant: red to black to green
float t1 = nx * 2.0f; // Horizontal interpolation
float t2 = ny * 2.0f; // Vertical interpolation
if (t1 + t2 <= 1.0f) {
// Interpolate between red and black
color = red * (1.0f - t1 - t2) + black * (t1 + t2);
} else {
// Interpolate between black and green
color = black * (2.0f - t1 - t2) + green * (t1 + t2 - 1.0f);
}
} else {
// Use bilinear interpolation for other areas
Vec4 topLeft = red;
Vec4 topRight = white;
Vec4 bottomLeft = black;
Vec4 bottomRight = green;
Vec4 top = topLeft * (1.0f - nx) + topRight * nx;
Vec4 bottom = bottomLeft * (1.0f - nx) + bottomRight * nx;
color = bottom * (1.0f - ny) + top * ny;
}
} else {
// Upper triangle: interpolate between green, blue, and white
if (nx >= 0.5f && ny >= 0.5f) {
// Top-right quadrant: green to white to blue
float t1 = (nx - 0.5f) * 2.0f; // Horizontal interpolation
float t2 = (ny - 0.5f) * 2.0f; // Vertical interpolation
if (t1 + t2 <= 1.0f) {
// Interpolate between green and white
color = green * (1.0f - t1 - t2) + white * (t1 + t2);
} else {
// Interpolate between white and blue
color = white * (2.0f - t1 - t2) + blue * (t1 + t2 - 1.0f);
}
} else {
// Use bilinear interpolation for other areas
Vec4 topLeft = red;
Vec4 topRight = white;
Vec4 bottomLeft = black;
Vec4 bottomRight = blue;
Vec4 top = topLeft * (1.0f - nx) + topRight * nx;
Vec4 bottom = bottomLeft * (1.0f - nx) + bottomRight * nx;
color = bottom * (1.0f - ny) + top * ny;
}
}
// Convert to [0,1] range for interpolation
float u = (nx + 1.0f) / 2.0f; // maps -1..1 to 0..1
float v = (ny + 1.0f) / 2.0f; // maps -1..1 to 0..1
// For a more natural gradient, we'll interpolate between the four corners
// and blend with the center color based on distance from center
// Bilinear interpolation between corners
Vec4 top = white * (1.0f - u) + red * u;
Vec4 bottom = blue * (1.0f - u) + black * u;
Vec4 cornerColor = top * (1.0f - v) + bottom * v;
// Calculate distance from center (0,0)
float distFromCenter = std::sqrt(nx * nx + ny * ny) / std::sqrt(2.0f); // normalize to [0,1]
Vec4 color = green * (1.0f - distFromCenter) + cornerColor * distFromCenter;
grid.addPoint(pos, color);
}
@@ -122,11 +87,12 @@ int main(int argc, char* argv[]) {
// Save as BMP
if (BMPWriter::saveBMP("output/gradient.bmp", imageData, WIDTH, HEIGHT)) {
std::cout << "Gradient image saved as 'gradient.bmp'" << std::endl;
std::cout << "Colors: " << std::endl;
std::cout << " Top-left: ff0000 (red)" << std::endl;
std::cout << "Color positions: " << std::endl;
std::cout << " Top-left: ffffff (white)" << std::endl;
std::cout << " Top-right: ff0000 (red)" << std::endl;
std::cout << " Center: 00ff00 (green)" << std::endl;
std::cout << " Bottom-right: 0000ff (blue)" << std::endl;
std::cout << " Gradient between ffffff and 000000 throughout" << std::endl;
std::cout << " Bottom-left: 0000ff (blue)" << std::endl;
std::cout << " Bottom-right: 000000 (black)" << std::endl;
} else {
std::cerr << "Failed to save gradient image" << std::endl;
return 1;