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polished the demo a bit

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This commit is contained in:
Reese Gallagher 2024-08-01 00:07:34 -04:00
parent 44a4e7f9dc
commit 6d6b751a95
1 changed files with 77 additions and 13 deletions
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88
examples/models/models_point_rendering.c
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@ -1,30 +1,38 @@
#include "raylib.h"
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#define NUM_POINTS 1000
#define MAX_POINTS 10000000
#define MIN_POINTS 1000
float randFloat()
{
return (float)rand() / RAND_MAX;
}
static Mesh GenMeshCustom(void)
static Mesh GenMeshCustom(int numPoints)
{
Mesh mesh = {
.triangleCount = 1,
.vertexCount = NUM_POINTS,
.vertices = (float *)MemAlloc(NUM_POINTS * 3 * sizeof(float)),
.vertexCount = numPoints,
.vertices = (float *)MemAlloc(numPoints * 3 * sizeof(float)),
.colors = (unsigned char*)MemAlloc(numPoints * 4 * sizeof(unsigned char)),
};
// https://en.wikipedia.org/wiki/Spherical_coordinate_system
for (int i = 0; i < NUM_POINTS; i++) {
for (int i = 0; i < numPoints; i++) {
float theta = PI * randFloat();
float phi = 2 * PI * randFloat();
float r = randFloat();
float r = 10.0f * randFloat();
mesh.vertices[i * 3 + 0] = r * sin(theta) * cos(phi);
mesh.vertices[i * 3 + 1] = r * sin(theta) * sin(phi);
mesh.vertices[i * 3 + 2] = r * cos(theta);
Color color = ColorFromHSV(r * 360.0f, 1.0f, 1.0f);
mesh.colors[i * 4 + 0] = color.r;
mesh.colors[i * 4 + 1] = color.g;
mesh.colors[i * 4 + 2] = color.b;
mesh.colors[i * 4 + 3] = color.a;
}
// Upload mesh data from CPU (RAM) to GPU (VRAM) memory
@ -44,25 +52,81 @@ int main()
InitWindow(800, 600, "Point Rendering");
Mesh mesh = GenMeshCustom();
Model model = LoadModelFromMesh(mesh);
Vector3 position = {0.0f, 0.0f, 0.0f};
bool drawSphere = true;
bool newMethod = true;
bool numPointsChanged = false;
int numPoints = 1000;
Mesh mesh = GenMeshCustom(numPoints);
Model model = LoadModelFromMesh(mesh);
SetTargetFPS(60);
while(!WindowShouldClose()) {
UpdateCamera(&camera, CAMERA_ORBITAL);
if (IsKeyPressed(KEY_SPACE)) drawSphere = !drawSphere;
if (IsKeyPressed(KEY_SPACE)) newMethod = !newMethod;
if (IsKeyPressed(KEY_UP)) {
numPoints = (numPoints * 10 > MAX_POINTS) ? MAX_POINTS : numPoints * 10;
numPointsChanged = true;
TraceLog(LOG_INFO, "num points %d", numPoints);
}
if (IsKeyPressed(KEY_DOWN)) {
numPoints = (numPoints / 10 < MIN_POINTS) ? MIN_POINTS : numPoints / 10;
numPointsChanged = true;
TraceLog(LOG_INFO, "num points %d", numPoints);
}
/* re-upload a different point cloud size */
if (numPointsChanged) {
UnloadModel(model);
mesh = GenMeshCustom(numPoints);
model = LoadModelFromMesh(mesh);
numPointsChanged = false;
}
BeginDrawing();
ClearBackground(BLACK);
BeginMode3D(camera);
/* The new method only uploads the points once to the GPU */
if (newMethod) {
DrawModelPoints(model, position, 1.0f, WHITE);
if (drawSphere)
DrawSphereWires(position, 1.0f, 10, 10, WHITE);
} else {
/* The old method must continually draw the "points" (lines) */
for (int i = 0; i < numPoints; i++) {
Vector3 pos = {
.x = mesh.vertices[i * 3 + 0],
.y = mesh.vertices[i * 3 + 1],
.z = mesh.vertices[i * 3 + 2],
};
Color color = {
.r = mesh.colors[i * 4 + 0],
.g = mesh.colors[i * 4 + 1],
.b = mesh.colors[i * 4 + 2],
.a = mesh.colors[i * 4 + 3],
};
DrawPoint3D(pos, color);
}
}
DrawSphereWires(position, 1.0f, 10, 10, YELLOW);
EndMode3D();
/* Text formatting */
Color color = WHITE;
int fps = GetFPS();
if ((fps < 30) && (fps >= 15)) color = ORANGE;
else if (fps < 15) color = RED;
DrawText(TextFormat("%2i FPS", fps), 20, 20, 40, color);
DrawText(TextFormat("Point Count %d", numPoints), 20, 550, 40, WHITE);
DrawText("Up - increase points", 20, 70, 20, WHITE);
DrawText("Down - decrease points", 20, 100, 20, WHITE);
DrawText("Space - draw mode", 20, 130, 20, WHITE);
if (newMethod) {
DrawText("DrawModelPoints", 20, 160, 20, GREEN);
} else {
DrawText("DrawPoint3D", 20, 160, 20, RED);
}
EndDrawing();
}