Phireh/hexnando
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The most ugly way to render a grid known to mankind

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Phireh 2022-11-10 23:26:13 +01:00
commit 7a95e4515d
1 changed files with 35 additions and 21 deletions
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56
main.c
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@ -101,16 +101,26 @@ int main()
hexgrid_t grid;
grid.rows = 1;
grid.columns = 1;
grid.rows = 3;
grid.columns = 3;
grid.hexes = calloc(1, sizeof(hex_t) * grid.rows * grid.columns);
for (size_t i = 0; i < grid.rows * grid.columns; ++i)
float scale = 1.0f / 5.0f;
for (size_t i = 0; i < grid.rows; ++i)
{
grid.hexes[i].position.x = 0.0f;
grid.hexes[i].position.y = 0.0f;
grid.hexes[i].position.z = 0.0f;
grid.hexes[i].position.w = 1.0f;
for (size_t j = 0; j < grid.columns; ++j)
{
float offset = 0.0f;
if (j % 2)
offset = sint(1.0f/6);
grid.hexes[i*grid.columns+j].position.x = (0.0f + j*(1 + cost(1.0f/6)));
grid.hexes[i*grid.columns+j].position.y = (0.0f + i*(sint(1.0f/6))*2.0f) + offset;
grid.hexes[i*grid.columns+j].position.z = 0.0f;
grid.hexes[i*grid.columns+j].position.w = 1.0f;
fprintf(stdout, "Position of hex %ld %ld is %f %f\n", i, j, grid.hexes[i*grid.columns+j].position.x, grid.hexes[i*grid.columns+j].position.y);
}
}
// Get OpenGL objects
@ -119,27 +129,31 @@ int main()
for (uint64_t i = 0; i < grid.columns * grid.rows; ++i)
{
vertices[i*21] = grid.hexes[i].position.x;
vertices[i*21+1] = grid.hexes[i].position.y;
vertices[i*21] = grid.hexes[i].position.x * scale;
vertices[i*21+1] = grid.hexes[i].position.y * scale;
vertices[i*21+2] = grid.hexes[i].position.z;
for (int j = 1; j < 7; ++j)
{
vertices[i*21+j*3] = grid.hexes[i].position.x + cost((j-1)/6.0f);
vertices[i*21+j*3+1] = grid.hexes[i].position.y + sint((j-1)/6.0f);
vertices[i*21+j*3] = (grid.hexes[i].position.x + cost((j-1)/6.0f)) * scale;
vertices[i*21+j*3+1] = (grid.hexes[i].position.y + sint((j-1)/6.0f)) * scale;
vertices[i*21+j*3+2] = grid.hexes[i].position.z;
}
}
unsigned int indices[] =
size_t nindices = grid.columns * grid.rows * 3 * 6;
unsigned int *indices = calloc(nindices, sizeof(unsigned int));
for (size_t i = 0; i < grid.columns*grid.rows; ++i)
{
0,1,2,
0,2,3,
0,3,4,
0,4,5,
0,5,6,
0,6,1
};
indices[i*6*3] = 0 + i*7; indices[i*6*3+1] = 1 + i*7; indices[i*6*3+2] = 2 + i*7;
indices[i*6*3+3] = 0 + i*7; indices[i*6*3+4] = 2 + i*7; indices[i*6*3+5] = 3 + i*7;
indices[i*6*3+6] = 0 + i*7; indices[i*6*3+7] = 3 + i*7; indices[i*6*3+8] = 4 + i*7;
indices[i*6*3+9] = 0 + i*7; indices[i*6*3+10] = 4 + i*7; indices[i*6*3+11] = 5 + i*7;
indices[i*6*3+12] = 0 + i*7; indices[i*6*3+13] = 5 + i*7; indices[i*6*3+14] = 6 + i*7;
indices[i*6*3+15] = 0 + i*7; indices[i*6*3+16] = 6 + i*7; indices[i*6*3+17] = 1 + i*7;
}
glGenVertexArrays(1, &vao);
glGenBuffers(1,&vbo);
@ -150,7 +164,7 @@ int main()
glBufferData(GL_ARRAY_BUFFER, 7*3*grid.rows*grid.columns*sizeof(float), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, nindices * sizeof(unsigned int), indices, GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3*sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
@ -170,7 +184,7 @@ int main()
glUseProgram(shader_program);
glBindVertexArray(vao);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glDrawElements(GL_TRIANGLES, 3*6, GL_UNSIGNED_INT, 0);
glDrawElements(GL_TRIANGLES, 3*6*grid.rows*grid.columns, GL_UNSIGNED_INT, 0);
glfwPollEvents();
glfwSwapBuffers(window);