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WIP: essais

This commit is contained in:
Adrien Bourmault 2024-10-07 09:05:54 +02:00
parent a000fcc414
commit 2a0ed92cfc
1 changed files with 40 additions and 41 deletions
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81
opengl_sandbox/main.c
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@ -14,9 +14,9 @@
GtkWidget *window;
// OpenGL objects
GLuint vao, vbo, ebo, instance_vbo, arrow_instance_vbo;
GLuint arrow_vao, arrow_vbo, arrow_ebo;
GLuint edge_ebo;
GLuint vao, arrow_vao;
GLuint vbo, arrow_vbo, cubes_instance_vbo, arrow_instance_vbo;
GLuint ebo, arrow_ebo, edge_ebo;
GLuint shader_program;
unsigned int num_instances = N_INSTANCE;
mat4 instance_matrices[N_INSTANCE];
@ -39,9 +39,9 @@ mat4 projection, view;
// Function Prototypes zone ---------------------------------------------------
GLuint create_shader_program ();
void setup_buffers ();
void setup_cubes_buffers ();
void setup_arrow_buffers ();
void setup_instance_data ();
void setup_cube_instance_data ();
void setup_arrow_instance_data();
static void on_realize (GtkGLArea *area);
static gboolean on_render (GtkGLArea *area, GdkGLContext *context);
@ -253,7 +253,7 @@ GLuint create_shader_program ()
}
// Setup OpenGL buffers (VBO, VAO, EBO for cubes and edges)
void setup_buffers ()
void setup_cubes_buffers ()
{
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
@ -280,29 +280,8 @@ void setup_buffers ()
glBindVertexArray(0);
}
void setup_arrow_buffers() {
glGenVertexArrays(1, &arrow_vao);
glBindVertexArray(arrow_vao);
// Vertex buffer for arrows
glGenBuffers(1, &arrow_vbo);
glBindBuffer(GL_ARRAY_BUFFER, arrow_vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(arrow_vertices), arrow_vertices, GL_STATIC_DRAW);
// Index buffer for arrows
glGenBuffers(1, &arrow_ebo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, arrow_ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(arrow_indices), arrow_indices, GL_STATIC_DRAW);
// Vertex attributes
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
glBindVertexArray(0);
}
// Setup instance data for cubes (random positions)
void setup_instance_data ()
void setup_cube_instance_data ()
{
g_message("[%s] setting up cube instance data...",
__func__);
@ -312,10 +291,10 @@ void setup_instance_data ()
g_message("[%s] random seed initialized",
__func__);
glGenBuffers(1, &instance_vbo);
glBindBuffer(GL_ARRAY_BUFFER, instance_vbo);
glGenBuffers(1, &cubes_instance_vbo);
glBindBuffer(GL_ARRAY_BUFFER, cubes_instance_vbo);
g_message("[%s] instance_vbo buffer bound",
g_message("[%s] cubes_instance_vbo buffer bound",
__func__);
for (unsigned int i = 0; i < num_instances; i++) {
@ -330,6 +309,7 @@ void setup_instance_data ()
glm_translate(instance_matrices[i], position);
}
g_message("[%s] generated %d cube instances",
__func__,
num_instances);
@ -355,7 +335,30 @@ void setup_instance_data ()
__func__);
}
void setup_arrow_instance_data() {
void setup_arrow_buffers()
{
glGenVertexArrays(1, &arrow_vao);
glBindVertexArray(arrow_vao);
// Vertex buffer for arrows
glGenBuffers(1, &arrow_vbo);
glBindBuffer(GL_ARRAY_BUFFER, arrow_vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(arrow_vertices), arrow_vertices, GL_STATIC_DRAW);
// Index buffer for arrows
glGenBuffers(1, &arrow_ebo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, arrow_ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(arrow_indices), arrow_indices, GL_STATIC_DRAW);
// Vertex attributes
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
glBindVertexArray(0);
}
void setup_arrow_instance_data()
{
// Define indices for the arrows (lines from center to cube faces)
GLuint arrow_indices[] = {
0, 1, // Arrow pointing to right face
@ -366,18 +369,12 @@ void setup_arrow_instance_data() {
0, 6 // Arrow pointing to back face
};
// Generate Vertex Array Object for arrows
glGenVertexArrays(1, &arrow_vao);
glBindVertexArray(arrow_vao);
// Generate Vertex Buffer Object for arrows
GLuint arrow_vbo;
glGenBuffers(1, &arrow_vbo);
glBindBuffer(GL_ARRAY_BUFFER, arrow_vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(arrow_vertices), arrow_vertices, GL_STATIC_DRAW);
// Generate Element Buffer Object for arrows
GLuint arrow_ebo;
glGenBuffers(1, &arrow_ebo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, arrow_ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(arrow_indices), arrow_indices, GL_STATIC_DRAW);
@ -436,9 +433,9 @@ static void on_realize(GtkGLArea *area)
// Create shader program and setup buffers
shader_program = create_shader_program();
setup_buffers();
setup_cubes_buffers();
setup_arrow_buffers();
setup_instance_data();
setup_cube_instance_data();
setup_arrow_instance_data(); // Setup arrow data
// Set the background color
@ -475,7 +472,7 @@ static gboolean on_render(GtkGLArea *area, GdkGLContext *context)
}
// Update the instance matrix buffer with the modified instance matrices
glBindBuffer(GL_ARRAY_BUFFER, instance_vbo);
glBindBuffer(GL_ARRAY_BUFFER, cubes_instance_vbo);
glBufferSubData(GL_ARRAY_BUFFER, 0, num_instances * sizeof(mat4), instance_matrices);
// Draw the cubes with the updated instance matrices
@ -500,6 +497,7 @@ static gboolean on_render(GtkGLArea *area, GdkGLContext *context)
glUniformMatrix4fv(viewLoc, 1, GL_FALSE, (const GLfloat *)view);
// Draw the arrows
glBindVertexArray(arrow_vao);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, arrow_ebo);
glDrawElementsInstanced(GL_LINES, 12, GL_UNSIGNED_INT, 0, num_instances);
@ -597,3 +595,4 @@ int main (int argc, char *argv[])
return status;
}