1 files changed, 212 insertions, 0 deletions
diff --git a/prge_model.c b/prge_model.c
new file mode 100644
index 0000000..44ded76
--- /dev/null
+++ b/prge_model.c
@@ -0,0 +1,212 @@
+Vertex vert(V3 pos, V2 texc)
+{
+	Vertex	v;
+
+	v.pos = pos;
+	v.texc = texc;
+
+	return v;
+}
+
+void mesh_init_buffers(Mesh *mesh)
+{
+	Assert(mesh->verts);
+	Assert(mesh->nverts > 0);
+	
+	glGenVertexArrays(1, &mesh->vao);
+	glBindVertexArray(mesh->vao);
+
+	glGenBuffers(1, &mesh->vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, mesh->vbo);
+	glBufferData(GL_ARRAY_BUFFER, mesh->nverts*sizeof(Vertex), mesh->verts, GL_STATIC_DRAW);
+
+	if (mesh->indices && (mesh->nindices > 0)) {
+		glGenBuffers(1, &mesh->ebo);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh->ebo);
+		glBufferData(GL_ELEMENT_ARRAY_BUFFER, mesh->nindices*sizeof(U32), mesh->indices, GL_STATIC_DRAW);
+	}
+
+	glEnableVertexAttribArray(PRGE_SHADER_POS_LOC);
+	glVertexAttribPointer(PRGE_SHADER_POS_LOC, 3, GL_FLOAT, GL_FALSE,
+			      sizeof(Vertex), OffsetOfMember(Vertex, pos));
+	glEnableVertexAttribArray(PRGE_SHADER_TEXC_LOC);
+	glVertexAttribPointer(PRGE_SHADER_TEXC_LOC, 2, GL_FLOAT, GL_FALSE,
+			      sizeof(Vertex), (void *)OffsetOfMember(Vertex, texc));
+	glBindVertexArray(0);
+}
+
+Mesh *mesh_init(Arena *arena, V3 origin, V3 rotate, Vertex *verts, U32 nverts, U32 *indices, U32 nindices)
+{
+	Mesh	*mesh;
+
+	mesh = arena_push(arena, sizeof(Mesh));
+
+	mesh->origin = origin;
+	mesh->rotate = rotate;
+
+	mesh->verts = verts;
+	mesh->nverts = nverts;
+
+	mesh->indices = indices;
+	mesh->nindices = nindices;
+
+	mesh->ntextures = 0;
+	MemoryZeroArray(mesh->textures);
+
+	mesh_init_buffers(mesh);
+
+	return mesh;
+}
+
+void mesh_add_texture(Mesh *mesh, Texture texture)
+{
+	Assert(mesh->ntextures+1 <= MAX_TEXTURE);
+	mesh->textures[mesh->ntextures++] = texture;
+}
+
+void mesh_clear(Mesh *mesh)
+{
+	glBindVertexArray(mesh->vao);
+	glDisableVertexAttribArray(PRGE_SHADER_POS_LOC);
+
+	glBindVertexArray(0);
+	glDeleteVertexArrays(1, &mesh->vao);
+	
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glDeleteBuffers(1, &mesh->vbo);
+
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+	glDeleteBuffers(1, &mesh->ebo);
+}
+
+void mesh_draw(Mesh *mesh)
+{
+	S32	i;
+
+	Assert(mesh->vao);
+
+	glBindVertexArray(mesh->vao);
+
+	for (i = 0; i < mesh->ntextures; i++) {
+		glActiveTexture(GL_TEXTURE0+i);
+		glBindTexture(GL_TEXTURE_2D, mesh->textures[i].id);
+	}
+
+	if (mesh->ebo)
+		glDrawElements(GL_TRIANGLES, mesh->nindices, GL_UNSIGNED_INT, 0);
+	else
+		glDrawArrays(GL_TRIANGLES, 0, mesh->nverts);
+
+	glBindVertexArray(0);
+} 
+
+Mesh *mesh_gen_quad(Arena *arena, V3 origin, V3 rotate, F32 w, F32 h)
+{
+	Mesh	*m;
+	Vertex	*verts;
+	U32	*indices;
+	U32	nverts, nindices;
+
+	nverts = 4;
+	verts = arena_push(arena, nverts*sizeof(Vertex));
+	verts[0] = vert(v3(-w/2.0f, -h/2.0f, 0.0f), v2(0.0f, 0.0f));
+	verts[1] = vert(v3(-w/2.0f, h/2.0f, 0.0f), v2(0.0f, 1.0f));
+	verts[2] = vert(v3(w/2.0f, -h/2.0f, 0.0f), v2(1.0f, 0.0f));
+	verts[3] = vert(v3(w/2.0f, h/2.0f, 0.0f), v2(1.0f, 1.0f));
+
+	nindices = 6;
+	indices = arena_push(arena, nindices*sizeof(U32));
+	indices[0] = 0;
+	indices[1] = 1;
+	indices[2] = 3;
+	indices[3] = 0;
+	indices[4] = 2;
+	indices[5] = 3;
+
+	m = mesh_init(arena, origin, rotate, verts, nverts, indices, nindices);
+
+	return m;
+}
+
+Mesh *mesh_gen_circle(Arena *arena, V3 origin, V3 rotate, F32 r, U32 nverts)
+{
+	Mesh	*m;
+	Vertex	*verts;
+	U32	*indices;
+	U32	nindices;
+	F32	angle, dangle;
+	U32	i, vi;
+
+	if (nverts < 3)
+		nverts = 3;
+
+	verts = arena_push(arena, nverts*sizeof(Vertex));
+
+	dangle = 2*F32_PI/(F32)nverts;
+	for (i = 0, angle = 0.0f; i < nverts; i++, angle += dangle)
+		verts[i] = vert(v3(f32cos(angle)*r, f32sin(angle)*r, 0.0f), V2_ZERO);
+
+	nindices = nverts*3;
+	indices = arena_push(arena, nindices*sizeof(U32));
+	for (i = 0, vi = 1; i < nindices; i += 3, vi++) {
+		indices[i] = 0;
+		indices[i+1] = vi;
+		indices[i+2] = (((vi+1) == (nverts)) ? 1 : (vi+1));
+	}
+
+	m = mesh_init(arena, origin, rotate, verts, nverts, indices, nindices);
+
+	return m;
+}
+
+Model *model_init(Arena *arena, V3 origin, V3 rotate, Mesh *meshes, U32 nmeshes)
+{
+	Model	*res;
+
+	res = arena_push(arena, sizeof(Model));
+
+	res->origin = origin;
+	res->rotate = rotate;
+	res->meshes = meshes;
+	res->nmeshes = nmeshes;
+
+	return res;
+}
+
+Model *model_load(Arena *arena, V3 origin, V3 rotate, Str8 filename)
+{
+	Model	*res;
+
+	res = 0;
+
+	/* TODO(pryazha): Load models with assimp? */
+
+	return res;
+}
+
+void model_draw(U32 shader, MAT4 *proj, MAT4 *view, Model *model)
+{
+	U32	i;
+	MAT4	modelmat, meshmodelmat, resmodelmat;
+	V3	resorigin, resrotate;
+
+	glUseProgram(shader);
+
+	shader_set_mat4fv(shader, PRGE_SHADER_PROJ_MAT, *proj);
+	shader_set_mat4fv(shader, PRGE_SHADER_VIEW_MAT, *view);
+
+	modelmat = mat4rotate(MAT4_IDENTITY, model->rotate);
+	modelmat = mat4transl(modelmat, model->origin);
+
+	for (i = 0; i < model->nmeshes; i++) {
+		meshmodelmat = mat4rotate(MAT4_IDENTITY, model->meshes[i].rotate);
+		meshmodelmat = mat4transl(meshmodelmat, model->meshes[i].origin);
+
+		resmodelmat = mat4mul(modelmat, meshmodelmat);
+
+		shader_set_mat4fv(shader, PRGE_SHADER_MODEL_MAT, resmodelmat);
+		mesh_draw(&model->meshes[i]);
+	}
+
+	glUseProgram(0);
+}