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feat: hook up canvas input to renderer

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This commit is contained in:
Froxwin
2026-03-07 12:26:59 +05:30
parent a1abe76dbd
commit d620caf02b
3 changed files with 43 additions and 42 deletions
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67
src/ui/vektorcanvas.c
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@@ -29,6 +29,7 @@ char* read_file(const char* path) {
static GLuint shader_program;
static GLuint vao;
// VektorPrimitiveBuffer prims = {0};
VertexBuffer vb;
static GLuint compile_shader(GLenum type, const char* src) {
@@ -81,50 +82,45 @@ static void init_geometry(void) {
// VertexBuffer vb =
// (VertexBuffer){.count = 3, .capacity = 3, .vertices = &vs[0]};
VektorPolygon triangle = *vektor_polygon_new();
vektor_polygon_add_point(&triangle, (V2){-0.5f, -0.5f}); // bottom-left
vektor_polygon_add_point(&triangle, (V2){0.5f, -0.5f}); // bottom-right
vektor_polygon_add_point(&triangle, (V2){0.0f, 0.5f}); // top-center
// VektorPolygon* triangle = vektor_polygon_new();
// vektor_polygon_add_point(triangle, (V2){-0.5f, -0.5f}); // bottom-left
// vektor_polygon_add_point(triangle, (V2){0.5f, -0.5f}); // bottom-right
// vektor_polygon_add_point(triangle, (V2){0.0f, 0.5f}); // top-center
VektorPrimitiveBuffer prims = {0};
vektor_primitivebuffer_add_primitive(
&prims,
(VektorPrimitive){.kind = VEKTOR_POLYGON, .polygon = &triangle});
// vektor_primitivebuffer_add_primitive(
// &prims, (VektorPrimitive){.kind = VEKTOR_POLYGON, .polygon =
// triangle});
vb = vektor_rasterize(&prims);
// for (size_t i = 0; i < vb.count; i++) {
// printf("Vertex %zu: x=%f, y=%f\n", i, vb.vertices[i].x,
// vb.vertices[i].y);
// }
GLuint vbo;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(V2), (void*)0);
glBindVertexArray(0);
}
static gboolean render(GtkGLArea* area, GdkGLContext* context,
VektorPrimitiveBuffer* prims) {
vb = vektor_rasterize(prims);
for (size_t i = 0; i < vb.count; i++) {
printf("Vertex %zu: x=%f, y=%f\n", i, vb.vertices[i].x,
vb.vertices[i].y);
}
GLuint vbo;
// 1. Create VAO
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
// 2. Create VBO
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
// 3. Upload your vertices (V2 = 2 floats per vertex)
glBufferData(GL_ARRAY_BUFFER, vb.count * sizeof(V2), vb.vertices,
GL_STATIC_DRAW);
// 4. Tell GL about the vertex layout
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, // layout location 0 in shader
2, // 2 components per vertex (x, y)
GL_FLOAT, // type
GL_FALSE, // do not normalize
sizeof(V2), // stride (size of one vertex)
(void*)0 // offset
);
glBindVertexArray(0);
}
static gboolean render(GtkGLArea* area, GdkGLContext* context) {
glUseProgram(shader_program);
GLuint uProjectionLoc = glGetUniformLocation(shader_program, "uProjection");
@@ -188,7 +184,8 @@ static void realize(GtkGLArea* area, gpointer user_data) {
init_geometry();
}
void vektor_canvas_init(VektorWidgetState* state, VektorCanvas* canvasOut) {
void vektor_canvas_init(VektorWidgetState* state, VektorCanvas* canvasOut,
VektorPrimitiveBuffer* prims) {
canvasOut->canvasWidget = state->workspaceCanvas;
canvasOut->width = VKTR_CANVAS_WIDTH;
canvasOut->height = VKTR_CANVAS_HEIGHT;
@@ -203,7 +200,7 @@ void vektor_canvas_init(VektorWidgetState* state, VektorCanvas* canvasOut) {
g_signal_connect(canvasOut->canvasWidget, "realize", G_CALLBACK(realize),
NULL);
g_signal_connect(canvasOut->canvasWidget, "render", G_CALLBACK(render),
NULL);
prims);
// gtk_picture_set_paintable(canvasOut->canvasWidget,
// GDK_PAINTABLE(canvasOut->canvasTexture));
// gtk_picture_set_content_fit(GTK_PICTURE(canvasOut->canvasWidget),