admin/mobile-game-core
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

feat: moving DVD-like box

Browse Source
This commit is contained in:
Amir Adal
2026-04-19 20:35:10 +02:00
parent 35874343d1
commit c08708b984
1 changed files with 59 additions and 60 deletions
Download Patch File Download Diff File Expand all files Collapse all files

119
main.cpp
View File

@@ -15,8 +15,8 @@
#define SCREEN_WIDTH 1600
#define SCREEN_HEIGHT 720
#define BOX_WIDTH 250
#define BOX_HEIGHT 250
#define BOX_WIDTH 100
#define BOX_HEIGHT 100
static SDL_Window *window = NULL;
@@ -25,45 +25,26 @@ static bool running = true;
static Uint8 color = 0x18;
static Uint64 elapsed = 0;
static float boxX = 0.f;
static float boxY = 0.f;
static float boxVelX = 1.f;
static float boxVelY = 1.f;
static float boxVelX = 0.5f;
static float boxVelY = 0.5f;
static float boxSpeed = 250.f;
static float boxSpeed = 300.f;
const char* vShader = "#version 300 es\n"
"layout (location = 0) in vec2 aPos;\n"
"uniform mat4 uTransform;\n"
"uniform vec4 uColor;\n"
"out vec4 color;\n"
"void main()\n"
"{\n"
" gl_Position = uTransform * vec4(aPos, 0.0, 1.0);\n"
" color = uColor;\n"
" gl_Position = vec4(aPos, 0.0, 1.0);\n"
"}";
const char* fShader = "#version 300 es\n"
"precision mediump float;\n"
"out vec4 fragColor;\n"
"in vec4 color;\n"
"void main()\n"
"{\n"
" fragColor = color;\n"
" fragColor = vec4(0.8, 0.8, 0.8, 1.0);\n"
"}";
void makeRotationZ(float angle, float* m)
{
float c = cosf(angle);
float s = sinf(angle);
// column-major (OpenGL style)
m[0] = c; m[4] = -s; m[8] = 0; m[12] = 0;
m[1] = s; m[5] = c; m[9] = 0; m[13] = 0;
m[2] = 0; m[6] = 0; m[10] = 1; m[14] = 0;
m[3] = 0; m[7] = 0; m[11] = 0; m[15] = 1;
}
void computeLetterbox(int windowW, int windowH,
int logicalW, int logicalH,
int* x, int* y, int* w, int* h)
@@ -80,6 +61,13 @@ void computeLetterbox(int windowW, int windowH,
*y = (windowH - *h) / 2;
}
struct Rect {
float x;
float y;
float w;
float h;
};
extern "C" int APP_MAIN(int argc, char **argv) {
SDL_SetAppMetadata("Example Renderer Primitives", "1.0", "com.example.renderer-primitives");
SDL_SetHint(SDL_HINT_ORIENTATIONS, "LandscapeLeft LandscapeRight");
@@ -141,15 +129,14 @@ extern "C" int APP_MAIN(int argc, char **argv) {
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
float vertices[] = {
// positions (x, y)
-0.5f, -0.5f,
0.5f, -0.5f,
0.5f, 0.5f,
-0.5f, -0.5f,
0.5f, 0.5f,
-0.5f, 0.5f};
float vertices[12] = {0};
Rect rect = {
.x = 50.f,
.y = 50.f,
.w = BOX_WIDTH,
.h = BOX_HEIGHT,
};
GLuint vao, vbo;
glGenVertexArrays(1, &vao);
@@ -157,7 +144,7 @@ extern "C" int APP_MAIN(int argc, char **argv) {
glBindVertexArray(vao);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_DYNAMIC_DRAW);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void *)0);
glEnableVertexAttribArray(0);
@@ -168,21 +155,18 @@ extern "C" int APP_MAIN(int argc, char **argv) {
int drawableW, drawableH;
SDL_GetWindowSizeInPixels(window, &drawableW, &drawableH);
#if defined(__ANDROID__)
int vx, vy, vw, vh;
computeLetterbox(drawableW, drawableH,
SCREEN_WIDTH, SCREEN_HEIGHT,
&vx, &vy, &vw, &vh);
glViewport(vx, vy, vw, vh);
#else
glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
#endif
glEnable(GL_DEPTH_TEST);
float transform[16];
float color[4];
color[0] = 0x18 / 255.f;
color[1] = 0xFF / 255.f;
color[2] = 0x18 / 255.f;
color[3] = 0xFF / 255.f;
while (running) {
SDL_Event event;
while (SDL_PollEvent(&event)) {
@@ -197,31 +181,46 @@ extern "C" int APP_MAIN(int argc, char **argv) {
// SDL_Log("dt: %f\n", dt);
dt /= 1000.f;
boxX += boxSpeed * boxVelX * dt;
boxY += boxSpeed * boxVelY * dt;
boxSpeed += 50.f * dt;
rect.x += boxSpeed * boxVelX * dt;
rect.y += boxSpeed * boxVelY * dt;
// boxSpeed += 50.f * dt;
if (boxX + BOX_WIDTH >= SCREEN_WIDTH || boxX <= 0) boxVelX *= -1.f;
if (boxY + BOX_HEIGHT >= SCREEN_HEIGHT || boxY <= 0) boxVelY *= -1.f;
if (rect.x + BOX_WIDTH >= SCREEN_WIDTH || rect.x <= 0) boxVelX *= -1.f;
if (rect.y + BOX_HEIGHT >= SCREEN_HEIGHT || rect.y <= 0) boxVelY *= -1.f;
// float xProj = -1 + rect.x / ((float)SCREEN_WIDTH / 2);
// float yProj = rect.y / ((float)SCREEN_HEIGHT / 2);
float xProj = (rect.x / SCREEN_WIDTH) * 2.0f - 1.0f;
float yProj = 1.0f - (rect.y / SCREEN_HEIGHT) * 2.0f;
float wProj = (rect.w / SCREEN_WIDTH) * 2.0f;
float hProj = (rect.h / SCREEN_HEIGHT) * 2.0f;
SDL_Log("%f::%f (%f:%f)\n", xProj, yProj, wProj, hProj);
vertices[0] = xProj;
vertices[1] = yProj;
vertices[2] = xProj + wProj;
vertices[3] = yProj;
vertices[4] = xProj + wProj;
vertices[5] = yProj - hProj;
vertices[6] = xProj;
vertices[7] = yProj;
vertices[8] = xProj;
vertices[9] = yProj - hProj;
vertices[10] = xProj + wProj;
vertices[11] = yProj - hProj;
glClearColor(0x18/255.f, 0x18/255.f, 0x18/255.f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Draw your 3D stuff here
float angle = SDL_GetTicks() / 1000.0f; // rotates over time
makeRotationZ(angle, transform);
GLuint tranformLoc = glGetUniformLocation(program, "uTransform");
GLuint colorLoc = glGetUniformLocation(program, "uColor");
glBindVertexArray(vao);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_DYNAMIC_DRAW);
glUseProgram(program);
glUniformMatrix4fv(tranformLoc, 1, GL_FALSE, transform);
color[1] = (float)((int)angle * 10 % 255) / 255.f;
glUniform4fv(colorLoc, 1, color);
glBindVertexArray(vao);
glDrawArrays(GL_TRIANGLES, 0, 6);